Journal of energy storage最新文献

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Boosting interfacial charge transfer and inspiring new insights into the α-Ni(OH)2 anode via novel double heterostructures in Li-ion batteries
IF 8.9 2区 工程技术
Journal of energy storage Pub Date : 2025-04-02 DOI: 10.1016/j.est.2025.116484
Jiacheng Rong , Shuyong Liang , Xicheng Gao , Lulin Xie , Chen Liu , Chengjiao Che , Zhen Liang , Jianqiang Bi
{"title":"Boosting interfacial charge transfer and inspiring new insights into the α-Ni(OH)2 anode via novel double heterostructures in Li-ion batteries","authors":"Jiacheng Rong ,&nbsp;Shuyong Liang ,&nbsp;Xicheng Gao ,&nbsp;Lulin Xie ,&nbsp;Chen Liu ,&nbsp;Chengjiao Che ,&nbsp;Zhen Liang ,&nbsp;Jianqiang Bi","doi":"10.1016/j.est.2025.116484","DOIUrl":"10.1016/j.est.2025.116484","url":null,"abstract":"<div><div>Heterostructure materials are expected to promote the development of high-performance Li-ion batteries (LIBs) to alleviate the increasingly serious energy crisis. For MXene-based composites with double heterostructures, however, simple and effective synthesis strategies are scarce. Herein, based on the layered Ti<sub>3</sub>C<sub>2</sub>T<sub><em>x</em></sub> MXene (denoted as T-MX), α-Ni(OH)<sub>2</sub>/TiO<sub>2</sub>@T-MX double heterostructures is architected via a one-step solvothermal method. As anodes for LIBs, the composite electrodes are equipped with fast interfacial charge transfer and deliver considerable cycling performance (602.4 mAh g<sup>−1</sup> after 480 cycles at 0.1 A g<sup>−1</sup>). Specially, inspired by the lithium storage behavior of α-Ni(OH)<sub>2</sub>/TiO<sub>2</sub>@T-MX anode, for the first time, the hidden electrochemical mechanism of α-Ni(OH)<sub>2</sub> anode-stepwise and reversible conversion reactions to α-NiOOH and further to NiO<sub>2</sub>-are clearly revealed by various ex situ techniques and the characterizations for cycled electrodes. Moreover, density functional theory (DFT) calculations, combined with experimental results, confirm the charge redistribution arising from the construction of double heterostructures, which enhances the interfacial charge transport and the multi-step conversion reaction of α-Ni(OH)<sub>2</sub>. This work offers unique insights into the design of MXene-based heterostructures and the studies of multiphase transformation mechanisms of composite electrodes.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"120 ","pages":"Article 116484"},"PeriodicalIF":8.9,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Comparison of battery technologies, size, and charging strategies for inter-city in–motion-charging buses
IF 8.9 2区 工程技术
Journal of energy storage Pub Date : 2025-04-02 DOI: 10.1016/j.est.2025.116463
Mikołaj Bartłomiejczyk , Leszek Jarzebowicz , Mirza Khalid Baig , Ibrahim Diab , Gautham Ram Chandra Mouli , Pavol Bauer
{"title":"Comparison of battery technologies, size, and charging strategies for inter-city in–motion-charging buses","authors":"Mikołaj Bartłomiejczyk ,&nbsp;Leszek Jarzebowicz ,&nbsp;Mirza Khalid Baig ,&nbsp;Ibrahim Diab ,&nbsp;Gautham Ram Chandra Mouli ,&nbsp;Pavol Bauer","doi":"10.1016/j.est.2025.116463","DOIUrl":"10.1016/j.est.2025.116463","url":null,"abstract":"<div><div>The growth of suburbs is a challenge for public transport, and new tools are needed to electrify suburban and intercity bus lines sustainably. In-motion-charging (IMC) buses combine the advantages of both trolleybuses and electric buses. This paper analyses a case of using IMC buses on a 17-km-long intercity route service between Arnhem and Wageningen in the Netherlands. The analysis covers different traction battery technologies, sizes, and charging strategies to find the economically optimal solution. The study was carried out using a numerical model of an IMC bus, which was validated and tuned based on year-round experimental recordings obtained from Arnhem trolleybuses. The model outputs were next used to analyse the batteries ageing under specific charging-discharging current profiles. The analysis shows that the most long-term cost-effective solution for the considered case consists of using merged IMC and opportunity charging as well as a 90 kWh LTO battery, whose expected lifetime would be more than 14 years.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"120 ","pages":"Article 116463"},"PeriodicalIF":8.9,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143748248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experimental study on inhibition effect of Novec-1230 on thermal runaway fire of lithium-ion battery packs induced by overcharging
IF 8.9 2区 工程技术
Journal of energy storage Pub Date : 2025-04-02 DOI: 10.1016/j.est.2025.116451
Kuo Wang , Dongxu Ouyang , Shuai Yuan , Dejian Wu , Jianqi Zhang , Chongye Chang , Ke Yan , Haoshi Sun , Xinming Qian
{"title":"Experimental study on inhibition effect of Novec-1230 on thermal runaway fire of lithium-ion battery packs induced by overcharging","authors":"Kuo Wang ,&nbsp;Dongxu Ouyang ,&nbsp;Shuai Yuan ,&nbsp;Dejian Wu ,&nbsp;Jianqi Zhang ,&nbsp;Chongye Chang ,&nbsp;Ke Yan ,&nbsp;Haoshi Sun ,&nbsp;Xinming Qian","doi":"10.1016/j.est.2025.116451","DOIUrl":"10.1016/j.est.2025.116451","url":null,"abstract":"<div><div>Thermal runaway (TR) is the main safety issue of lithium-ion batteries (LIBs), especially for large-scale LIB packs which are composed of multiple modules in series and parallel combinations. Considering TR of LIB packs would be much more serious, effective prevention and control measures are urgently needed. This work investigates the suppressive effect of Novec-1230 on the fire induced by overcharging in a 3P4S lithium iron phosphate (LFP) battery module. The surface temperature, module voltage, temperature rise rate, temperature distribution in pack, total voltage, extinguishing process, battery wreckage, and real-time changes in gas concentration were determined. During the suppression process, Novec-1230 can effectively reduce the surface temperature of the battery without TR, and the cooling rate is up to −0.39 °C/s. For the battery that has started the TR, Novec-1230 cannot inhibit the chain reaction inside the battery. When Novec-1230 is released, the battery temperature still initially rises, but the temperature rise rate is significantly reduced. Once the heat generation of the battery gradually reaches a balance point with the heat absorption from the vaporization of Novec-1230 in its liquid state, the battery temperature begins to decline, the entire fire suppression process lasted for 81 s. After the flame is extinguished, the concentration of combustible gases begins to rise sharply, with the concentrations of H<sub>2</sub> and CO reaching 1078 ppm and 164 ppm, respectively. Under the inducement of an external igniter, the battery reignites. But the TR does not continue to propagate ultimately, and six batteries do not undergo TR. This work confirms the suppressive effect of Novec-1230 on large LIB packs, effectively mitigating the TR of batteries induced by overcharging.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"120 ","pages":"Article 116451"},"PeriodicalIF":8.9,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Enhancing building energy performance and climate resilience with phase change materials and reflective coatings
IF 8.9 2区 工程技术
Journal of energy storage Pub Date : 2025-04-02 DOI: 10.1016/j.est.2025.116422
Md Jaynul Abden , Zhong Tao , Mohammad A. Alim , Jannatul Dil Afroze , Vivian W.Y. Tam
{"title":"Enhancing building energy performance and climate resilience with phase change materials and reflective coatings","authors":"Md Jaynul Abden ,&nbsp;Zhong Tao ,&nbsp;Mohammad A. Alim ,&nbsp;Jannatul Dil Afroze ,&nbsp;Vivian W.Y. Tam","doi":"10.1016/j.est.2025.116422","DOIUrl":"10.1016/j.est.2025.116422","url":null,"abstract":"<div><div>Enhancing energy efficiency in residential buildings is essential for reducing CO<sub>2</sub> emissions and meeting the growing demands of global energy standards. This study investigates the impacts of retrofitting existing Australian houses with phase change materials (PCMs) and reflective coatings on annual energy savings, star ratings and performance during heatwaves. Experimental results demonstrate that applying PCM boards to walls, ceilings or both resulted in a maximum reduction of peak indoor air temperature by 5.8 °C when both surfaces were treated, allowing a peak load shift of up to 71 min into the off-peak period. The study evaluates the energy performance of retrofitted houses in Sydney, Alice Springs, and Darwin. Using experimental data and validated EnergyPlus simulations, optimal retrofit configurations achieved annual energy savings of 31.9 kWh/m<sup>2</sup>·y in Sydney, 60.6 kWh/m<sup>2</sup>·y in Alice Springs, and 85.6 kWh/m<sup>2</sup>·y in Darwin, corresponding to improved star ratings of 7.0, 7.1, and 7.6, respectively. During heatwaves, retrofitted houses experienced significant reductions in thermal discomfort, achieving 100 % in Sydney, 86.7 % in Alice Springs and 92.6 % in Darwin. Economic analysis revealed payback periods ranging from 5.3 to 24 years, depending on local climate conditions. These findings underscore the feasibility and effectiveness of retrofitting strategies to enhance energy efficiency, improve thermal comfort and achieve Australia's 7-star energy standard.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"120 ","pages":"Article 116422"},"PeriodicalIF":8.9,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143748241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experimental and numerical study of expansion of pouch lithium-ion cell considering electrochemical-thermal-mechanical coupling
IF 8.9 2区 工程技术
Journal of energy storage Pub Date : 2025-04-02 DOI: 10.1016/j.est.2025.116462
Shixing Bai , Peichao Li , Xiaoqiang Zhang , Hengyun Zhang , Dongxu Zuo , Han Zhao
{"title":"Experimental and numerical study of expansion of pouch lithium-ion cell considering electrochemical-thermal-mechanical coupling","authors":"Shixing Bai ,&nbsp;Peichao Li ,&nbsp;Xiaoqiang Zhang ,&nbsp;Hengyun Zhang ,&nbsp;Dongxu Zuo ,&nbsp;Han Zhao","doi":"10.1016/j.est.2025.116462","DOIUrl":"10.1016/j.est.2025.116462","url":null,"abstract":"<div><div>During the charging and discharging process, the volume expansion change of lithium-ion batteries (LIBs) can cause a series of mechanical damage affecting the state-of-health (SOH) and performance. Therefore, the reasonable monitoring and analyzing the mechanical signal changes of LIBs are key to advancing battery condition monitoring technology. In this study, the changes in the expansion displacement of the battery under different constant current charging and discharging rates are experimentally studied and an electrochemical-thermal-mechanical (ETM) coupling model for battery volume expansion is established. The coupling model innovatively considers the effect of solid electrolyte interphase (SEI) formation and porosity on battery expansion, which can more accurately simulate the battery expansion process at different C-rates. The results show that the cell volume expansion is caused by intercalation reaction, thermal expansion and SEI growth. In addition, the relationship between SEI and expansion displacement is investigated by using <span><math><mi>dU</mi><mo>/</mo><mi>dQ</mi></math></span> and <span><math><mi>dV</mi><mo>/</mo><mi>dQ</mi></math></span> curves. The expansion displacement caused by SEI formation is calculated by the established model. Finally, the non-uniform distribution of SEI films in space is analyzed. This study is of benefit to understand the factors that lead to battery volume expansion. It also has potential applications in enhancing mechanical signal prediction for LIBs management systems.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"120 ","pages":"Article 116462"},"PeriodicalIF":8.9,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optimal market-based battery energy storage system capacity sizing: Considering strategic behavior of collusions in the electricity day-ahead market
IF 8.9 2区 工程技术
Journal of energy storage Pub Date : 2025-04-02 DOI: 10.1016/j.est.2025.116309
Xueshan Lin , Yaxian Zheng , Zhongming Xiang , Beibei Wang
{"title":"Optimal market-based battery energy storage system capacity sizing: Considering strategic behavior of collusions in the electricity day-ahead market","authors":"Xueshan Lin ,&nbsp;Yaxian Zheng ,&nbsp;Zhongming Xiang ,&nbsp;Beibei Wang","doi":"10.1016/j.est.2025.116309","DOIUrl":"10.1016/j.est.2025.116309","url":null,"abstract":"<div><div>Battery Energy Storage Systems (BESS) play a crucial role in mitigating the volatility and intermittency of Renewable Energy Sources (RESs) and are widely deployed across the globe. To support the growth of BESS, governments have introduced various policies, including subsidies aimed at aligning BESS costs with benchmark RES costs. However, these measures can lead to strategic collusion between BESS and RES operators when BESS capacity is insufficient, resulting in the waste of social resources when surplus capacity exists. To address this, this paper presents an Optimal BESS Capacity Sizing (OBCS) framework based on day-ahead (DA) market clearing, designed to promote market operations that closely resemble a completely competitive without the need for policies that directly target strategic behavior control. We propose a collusive bidding analysis method to assess the strategic behavior within collusions. Building on this, we introduce an OBCS framework that leverages collusive bidding insights and existing BESS subsidies to regulate strategic behavior. Finally, the proposed OBCS method is applied to both test and real electricity markets, demonstrating that the operation cost of the DA market can be reduced by 24.29 % in abundant scenario and 13.62 % in scarce scenario compared to the initial state.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"120 ","pages":"Article 116309"},"PeriodicalIF":8.9,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143748245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The optimal integrating state of VOx with the synergistic effect of Cu2+ cation and polyaniline for high performance flexible fiber zinc-ion battery
IF 8.9 2区 工程技术
Journal of energy storage Pub Date : 2025-04-02 DOI: 10.1016/j.est.2025.116415
Juan Xu, Nengneng Han, Sihao Chen, Yahui Zhang, Yuezhou Jing, Zhiliang Chen, Silei Wang, Renhao Chen, Pibin Bing, Zhongyang Li
{"title":"The optimal integrating state of VOx with the synergistic effect of Cu2+ cation and polyaniline for high performance flexible fiber zinc-ion battery","authors":"Juan Xu,&nbsp;Nengneng Han,&nbsp;Sihao Chen,&nbsp;Yahui Zhang,&nbsp;Yuezhou Jing,&nbsp;Zhiliang Chen,&nbsp;Silei Wang,&nbsp;Renhao Chen,&nbsp;Pibin Bing,&nbsp;Zhongyang Li","doi":"10.1016/j.est.2025.116415","DOIUrl":"10.1016/j.est.2025.116415","url":null,"abstract":"<div><div>Benefiting from the open crystal structure and high theoretical specific capacity, layered vanadium oxides have become the most promising cathode material for fiber zinc-ion batteries (ZIBs). However, irreversible structural collapse and slow ion diffusion during Zn<sup>2+</sup> insertion/extraction lead to poor rate performance and shortened cycling lifespan, limiting their potential application in the further development of flexible energy storage devices. In this paper, a “two-in-one” strategy was provided by inserting copper ions (Cu<sup>2+</sup>) between the vanadium pentoxide layers integrating with coating polyaniline (PANI) on the surface to make the layered V<sub>2</sub>O<sub>5</sub> derivatized into lamellar microspheres (CuVO@PANI), which achieved high specific surface area and porous channels. And, the crystal lattice spacing of V<sub>2</sub>O<sub>5</sub> expands from 4.4 Å to 16.1 Å owing to the intercalation of Cu<sup>2+</sup>. Moreover, the PANI coating enhanced the “structural deformation restraint” effect on CuVO@PANI along with improved electrical conductivity. Conversely, the Cu<sup>2+</sup> and polyaniline co-embedded V<sub>2</sub>O<sub>5</sub> (CuVO-PANI) structure has the crystal face spacing of merely 11.3 Å owing to the existence of destructive Cu<img>N bond. Thanks to the optimal synergistic effect of Cu<sup>2+</sup> and polyaniline, the structural integrity and redox reversibility of CuVO@PANI are significantly enhanced. The CuVO@PANI electrode achieved high specific capacity of 672.2 mAh g<sup>−1</sup> at 0.1 A g<sup>−1</sup> and maintains 269.2 mAh g<sup>−1</sup> even after 2000 cycles at the high current density of 6 A g<sup>−1</sup>, showing an extremely high capacity retention. Surprisingly, the quasi-solid-state fiber-shaped ZIBs employing the CuVO@PANI cathodes exhibit respectable performance and excellent flexibility at different bending angles. Therefore, the optimal cooperative regulation of cations and conductive polymers is the promising strategy to improve the electrochemical performance of the cathode for making fiber zinc ion batteries with high energy density.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"120 ","pages":"Article 116415"},"PeriodicalIF":8.9,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143748247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Solidification study of DI water in a spherical capsule for cool thermal energy storage applications
IF 8.9 2区 工程技术
Journal of energy storage Pub Date : 2025-04-02 DOI: 10.1016/j.est.2025.116513
Kaiwalya Raj , Eleni Mangina , Pandiyarajan Vellaichamy , Velraj Ramalingam
{"title":"Solidification study of DI water in a spherical capsule for cool thermal energy storage applications","authors":"Kaiwalya Raj ,&nbsp;Eleni Mangina ,&nbsp;Pandiyarajan Vellaichamy ,&nbsp;Velraj Ramalingam","doi":"10.1016/j.est.2025.116513","DOIUrl":"10.1016/j.est.2025.116513","url":null,"abstract":"<div><div>Cool thermal energy storage (CTES) systems utilising packed beds commonly employ spherical capsules as containers for thermal storage. In these systems, the phase change material (PCM) is solidified using a chiller, a process that consumes considerable energy. The time required for complete PCM solidification directly impacts chiller operation duration, and reducing this time can enhance chiller efficiency and lower electricity costs. Research has identified several factors influencing PCM solidification time, including the external surface heat transfer coefficient, cooling fluid temperature, capsule geometry, and PCM thermal conductivity. The present study focused on two key parameters—surface heat transfer coefficient and PCM thermal conductivity—to investigate the solidification of deionized (DI) water as a PCM. Experimental investigations were conducted, yielding significant insights. Results from experiments also supported the theoretical formula that was applied in the parametric study. Both theoretical and experimental findings revealed that approximately 50 % of the total solidification time was dedicated to freeze the central 25 % of the water within the capsule. Parametric studies indicated that the influence of the external convective heat transfer coefficient, when employing air and water-glycol mixture as heat transfer fluids, was significant up to 35 W m<sup>−2</sup> K<sup>−1</sup> and 500 W m<sup>−2</sup> K<sup>−1</sup>, respectively. The findings of this study will benefit energy storage researchers and engineers, as well as those in the chemical, food, and plastics processing industries.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"120 ","pages":"Article 116513"},"PeriodicalIF":8.9,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143748249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Improved prediction model of energy performance for variable-speed pumps-as-turbines (PATs) in micro-hydropower schemes
IF 8.9 2区 工程技术
Journal of energy storage Pub Date : 2025-04-02 DOI: 10.1016/j.est.2025.116388
Peijian Zhou , Yangfan Gu , Wenjin Yu , Yanzhao Wu , Zhifeng Yao , Jiegang Mou
{"title":"Improved prediction model of energy performance for variable-speed pumps-as-turbines (PATs) in micro-hydropower schemes","authors":"Peijian Zhou ,&nbsp;Yangfan Gu ,&nbsp;Wenjin Yu ,&nbsp;Yanzhao Wu ,&nbsp;Zhifeng Yao ,&nbsp;Jiegang Mou","doi":"10.1016/j.est.2025.116388","DOIUrl":"10.1016/j.est.2025.116388","url":null,"abstract":"<div><div>The variable speed regulation in pumps-as-turbines (PATs) plays a pivotal role in micro-pumped hydro energy storage (MPHES) systems by expanding operational parameters, optimizing energy conversion efficiency, and augmenting system adaptability through enhanced dynamic response characteristics. While existing studies have proposed empirical formulas, these models are often limited to optimal operating points under specific conditions, leaving their accuracy and applicability under broader variable speed conditions insufficiently validated. This paper presents an improved prediction model for the energy performance of variable-speed PATs, integrating turbine theoretical models with composition analysis method to modify the affinity laws. The model utilizes a segmented analysis approach that classifies the affinity laws into three categories based on speed ratios, ensuring more accurate predictions across diverse operating conditions. An improved whale optimization algorithm is employed to systematically refine the coefficients of the modified affinity laws. The most optimal modification is selected through a comparison of R<sup>2</sup> values for each model. The proposed model demonstrates a significant enhancement in prediction accuracy, particularly for low and high speed ratios, with an average improvement of 10 % over existing models. This work addresses critical gaps in current PAT energy performance prediction methods and provides a more robust framework for optimizing energy efficiency in micro-hydropower systems.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"120 ","pages":"Article 116388"},"PeriodicalIF":8.9,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143760577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Zinc storage mechanism and gas production analysis of chestnut-like V6O13·xH2O in aqueous zinc-ion batteries under different voltage windows
IF 8.9 2区 工程技术
Journal of energy storage Pub Date : 2025-04-02 DOI: 10.1016/j.est.2025.116512
Litao Yu , Wenjie Ma , Xiaoqiang Miao , Qingquan Kong , Xuguang An , Jing Zhang , Lisi Xie , Qian Liu , Xiaolei Li , Weitang Yao
{"title":"Zinc storage mechanism and gas production analysis of chestnut-like V6O13·xH2O in aqueous zinc-ion batteries under different voltage windows","authors":"Litao Yu ,&nbsp;Wenjie Ma ,&nbsp;Xiaoqiang Miao ,&nbsp;Qingquan Kong ,&nbsp;Xuguang An ,&nbsp;Jing Zhang ,&nbsp;Lisi Xie ,&nbsp;Qian Liu ,&nbsp;Xiaolei Li ,&nbsp;Weitang Yao","doi":"10.1016/j.est.2025.116512","DOIUrl":"10.1016/j.est.2025.116512","url":null,"abstract":"<div><div>Aqueous zinc-ion batteries (ZIBs) have attracted considerable attention due to their abundant resources and high safety, making them strong candidates for the next generation of energy storage devices. Vanadium-based cathode materials exhibit higher specific capacity and high rate performance, but their stability needs to be improved and issues such as low stability and gas evolution need to be addressed. In response, a solvothermal method was used in this study to synthesize chestnut-like V<sub>6</sub>O<sub>13</sub> hydrated oxide materials. V<sub>6</sub>O<sub>13</sub>·<em>x</em>H<sub>2</sub>O was investigated for its specific capacitance, rate performance, stability and gas evolution behavior at different voltage ranges. The results show that V<sub>6</sub>O<sub>13</sub>·<em>x</em>H<sub>2</sub>O exhibits excellent specific capacitance and rate performance operating from 0.2 to 1.4 V, while exhibiting no gas evolution during cycling. In contrast, when the voltage is increased above 1.5 V, V<sub>6</sub>O<sub>13</sub>·<em>x</em>H<sub>2</sub>O shows a distinct activation plateau during the first charge, accompanied by the intercalation of H<sub>3</sub>O<sup>+</sup> in addition to Zn ions and a phase transition of the material, leading to a noticeable gas evolution at the electrode, which is detrimental to practical use. Furthermore, in the voltage range of 0.2–1.4 V, V<sub>6</sub>O<sub>13</sub>·<em>x</em>H<sub>2</sub>O exhibits superior cycling stability over extended cycles.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"120 ","pages":"Article 116512"},"PeriodicalIF":8.9,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143748246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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