Yuan Liu , He Qi , Guanghu He , Xiaogang Luo , Huifen Yu , Zhongna Yan , Hang Luo , Dou Zhang , Jie Wu , Jun Chen
{"title":"2D nanoarchitecture-engineered polyetherimide dielectrics with thermally stable permittivity-breakdown dual enhancement","authors":"Yuan Liu , He Qi , Guanghu He , Xiaogang Luo , Huifen Yu , Zhongna Yan , Hang Luo , Dou Zhang , Jie Wu , Jun Chen","doi":"10.1016/j.est.2025.117781","DOIUrl":"10.1016/j.est.2025.117781","url":null,"abstract":"<div><div>To address the increasing demand for capacitive energy storage in high-temperature environments, the development of polymer dielectrics with high energy storage density, energy efficiency, and excellent thermal stability is critical. Here, ultra-low loadings (<0.5 wt%) of wide-bandgap (∼3.43 eV) two-dimensional CaBi<sub>2</sub>Nb<sub>2</sub>O<sub>9</sub> (CBN) flakes are incorporated into a polyetherimide (PEI) polymer matrix. The addition of CBN flakes increases Young's modulus and bandgap of the nanocomposite, which helps to block the propagation of electrical trees, as indicated by the simulation results. This also suppresses carrier migration and effectively reduces high-temperature leakage current density, leading to a significant improvement in the breakdown strength and energy density of the CBN/PEI nanocomposites at high temperatures. For instance, the PEI nanocomposites with 0.3 wt% achieve an energy density of 3.24 J/cm<sup>3</sup> with an efficiency (η) exceeding 90 % at 150 °C. Even at 200 °C, with η > 90 %, the discharge energy density remains as high as 2.22 J/cm<sup>3</sup>, which is 90 % higher than that of PEI. Notably, after 10<sup>5</sup> charge-discharge cycles, no degradation in energy density or efficiency is observed at elevated temperatures. This study presents a straightforward and broadly applicable strategy for developing high-temperature polymer dielectrics.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"132 ","pages":"Article 117781"},"PeriodicalIF":8.9,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144696795","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}
Alessio Tafone , Roberto Pili , Tobias Massier , Lizhong Yang , Harald Klein
{"title":"Liquid air energy storage (LAES) integrated into the hydrogen economy – Techno-economic optimization of waste cold recovery from liquid hydrogen regasification","authors":"Alessio Tafone , Roberto Pili , Tobias Massier , Lizhong Yang , Harald Klein","doi":"10.1016/j.est.2025.117763","DOIUrl":"10.1016/j.est.2025.117763","url":null,"abstract":"<div><div>A liquid air energy storage (LAES) system is a promising Carnot battery configuration capable of efficiently recovering waste heat and cold energy carriers. Among these, liquid hydrogen (LH₂) regasification presents a significant opportunity due to its high exergy content and its regasification temperature, which aligns well with the liquid air liquefaction process. While most existing studies focus on integrating LAES with liquid natural gas (LNG) regasification or improving hydrogen liquefaction via liquid air regasification, this work takes a novel approach by enhancing liquid air liquefaction through the utilization of waste cold from LH₂ regasification. Additionally, this study explores an economic innovation, the valorization of clean dry air discharged by LAES, which has not been extensively examined in prior literature. A novel LAES configuration is proposed and subjected to a techno-economic analysis, comparing its performance with a stand-alone LAES system. Results show that the proposed integration increases round-trip efficiency by 15 %, reduces the levelized cost of storage by 60 %, and achieves a payback period of under 10 years. These findings provide valuable insights for both academia and industry, advancing the development of more efficient and economically viable LAES systems.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"132 ","pages":"Article 117763"},"PeriodicalIF":8.9,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144702231","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}
{"title":"Optimization of solar-powered cooling systems for data centers using phase change materials based on energy, exergy, and eco-exergy analysis: A case study","authors":"Daryoush Dadpour , Mahdi Deymi-Dashtebayaz , Majid Kheir Abadi , Sébastien Poncet","doi":"10.1016/j.est.2025.117853","DOIUrl":"10.1016/j.est.2025.117853","url":null,"abstract":"<div><div>This study addresses the challenge of meeting the cooling demands of data centers using solar energy, which is inherently intermittent and weather-dependent. To overcome this issue, an advanced solar-powered cooling system is developed, integrating thermal energy storage (TES) with phase change materials (PCMs) to ensure a consistent thermal supply during non-solar hours. The system utilizes the thermodynamic properties of three PCMs—Adipic acid, Dimethyl terephthalate, and Suberic acid—evaluated based on their density, latent heat of fusion, melting temperature, and specific heat capacity. A multi-objective optimization using a genetic algorithm (GA), followed by the TOPSIS method, is employed to enhance system performance by minimizing cost and maximizing efficiency. Among the materials studied, Dimethyl terephthalate exhibits the highest exergy efficiency of 20.36 % during charging, making it the most suitable PCM for the application. The optimized system achieves a coefficient of performance (COP) of 0.79 and an operating cost of $56.31 per hour, with peak efficiency observed during summer radiation conditions. Seasonal analysis reveals a 67.57 % improvement in exergy efficiency during summer compared to autumn, highlighting the impact of solar availability. The results underscore the critical role of PCM thermodynamic properties and TES design in enhancing system resilience and cost-effectiveness. This research sets a benchmark for integrating renewable energy into high-efficiency cooling systems, offering a practical and sustainable solution for thermal management in data centers.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"132 ","pages":"Article 117853"},"PeriodicalIF":8.9,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144696794","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}
Guangfeng Wang, Changlong Li, Zhongrui Cui, Haitao Yuan, Naxin Cui
{"title":"A practical state of health estimation method for lithium-ion batteries using charging duration in different voltage segments","authors":"Guangfeng Wang, Changlong Li, Zhongrui Cui, Haitao Yuan, Naxin Cui","doi":"10.1016/j.est.2025.117712","DOIUrl":"10.1016/j.est.2025.117712","url":null,"abstract":"<div><div>Accurate state of health (SOH) estimation for lithium-ion batteries is essential for the safety and reliability of electric vehicles and energy storage system. However, the variability and unpredictability of actual charging voltage ranges limit the applicability of many existing methods. This study estimates SOH using a data-driven method that utilizes the charging duration of different voltage segments, making it applicable to a wide range of charging voltages. The whale optimization algorithm-optimized radial basis function neural network (WOA-RBFNN) is employed for SOH estimation. Five voltage segments with significantly changes due to battery aging are selected based on incremental capacity analysis (ICA), instead of directly selecting the charging duration of the voltage segments or the peaks and valleys from the incremental capacity curve (ICC). It is verified through ICA that the charging duration is proportional to the ICC’ envelope area, making it a suitable health indicator (HI) for each voltage segment. Then, the WOA-RBFNN is employed to construct the mapping between charging duration and SOH. The proposed method is validated using two representative datasets. The results demonstrate that the mean absolute error is below 0.589%, and the root mean square error is below 0.701%. The proposed method is applicable to a wide range of charging voltage, enhancing its practical usability.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"132 ","pages":"Article 117712"},"PeriodicalIF":8.9,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144685889","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}
Peiyuan Li , Xinquan Zou , Yuwei Feng , Jiangfeng Luo , Shuolei Ma , Jianxiong Wang , Weihong Guo , Jikui Wang
{"title":"Reduced graphene oxide/calcium alginate/polyethylene glycol composite phase change material with double-network structure for enhanced photothermal conversion","authors":"Peiyuan Li , Xinquan Zou , Yuwei Feng , Jiangfeng Luo , Shuolei Ma , Jianxiong Wang , Weihong Guo , Jikui Wang","doi":"10.1016/j.est.2025.117791","DOIUrl":"10.1016/j.est.2025.117791","url":null,"abstract":"<div><div>Phase change materials (PCMs) are widely used in thermal energy storage and temperature regulation due to their ability to absorb and release latent heat during phase transitions. However, conventional PCMs often suffer from leakage and low thermal conductivity, which significantly limits their practical applications. Although polymer networks have been employed to encapsulate PCMs, challenges such as lack of functional modification, complex processing steps and high production costs still need to be resolved. We presented a strategy for synthesizing a double-network composite phase change material through the in situ self-assembly of graphene oxide (GO) within a sodium alginate (SA) matrix, combined with ionic crosslinking between SA and Ca<sup>2+</sup>, resulting in a reduced graphene oxide/calcium alginate/polyethylene glycol (RGO/CA/PEG) composite phase change material. CA imparted good dispersibility to RGO under the premise of effective encapsulation of PEG, and reduced the pressure of RGO encapsulation, resulting in a significant reduction in the preparation cost of the material. The results show that the RGO/CA/PEG has a high energy storage density (145.54 J/g) and can be maintained at 70 °C for 6 h without any leakage. Meanwhile, the construction of the RGO/CA double network enabled the PEG to have good thermal conductivity (127.78 % improvement over pure PEG) and photothermal conversion (85.54 %). The above studies show that the material has good application prospects for solar energy harvesting, battery thermal management, and thermal energy storage.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"132 ","pages":"Article 117791"},"PeriodicalIF":8.9,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144685891","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}
Victor Vega–Garita , Mohsen Heydarzadeh , Amirhossein Hosseinzadeh Dadash , Eero Immonen
{"title":"The need for aging-aware control methods in lithium-ion batteries: A review","authors":"Victor Vega–Garita , Mohsen Heydarzadeh , Amirhossein Hosseinzadeh Dadash , Eero Immonen","doi":"10.1016/j.est.2025.117653","DOIUrl":"10.1016/j.est.2025.117653","url":null,"abstract":"<div><div>Lithium-ion batteries are among the most expensive and environmentally impactful components in energy storage solutions. Maximizing their lifetime is critical to reducing their environmental footprint and economic cost. To achieve this, battery management systems must accurately assess the state of health of the battery and dynamically adjust operating conditions to mitigate degradation. This review examines existing studies on aging-aware control methods for Li-ion batteries, categorizing their approaches, comparing their effectiveness, and identifying key research gaps. A conceptual framework for an online aging-aware control system is proposed, serving as a reference for future research. This work underscores the importance of developing robust control methods that address the degradation challenges while advancing the sustainability and performance of Li-ion battery technologies.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"132 ","pages":"Article 117653"},"PeriodicalIF":8.9,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144685793","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}
Juan Du, Shuao Jia, Xiangxiu Huang, Tao Xie, Lei Zhao, Yuxiang Hong
{"title":"CFD assessment on thermal management behavior of lithium ion battery by employing phase change material and spiral fins","authors":"Juan Du, Shuao Jia, Xiangxiu Huang, Tao Xie, Lei Zhao, Yuxiang Hong","doi":"10.1016/j.est.2025.117707","DOIUrl":"10.1016/j.est.2025.117707","url":null,"abstract":"<div><div>Boosting the heat transfer capability of phase change materials (PCM) is crucial for their application in the efficient thermal management of power batteries. One of the most prevalent enhancement methods is the use of fins. This paper innovatively presents a spiral fin-PCM design for the thermal management of 26650 batteries. The effects of fin numbers (<em>N</em>) and rotational angles (<em>θ</em>) on thermal performance were numerically scrutinized, with results compared to traditional straight fins. Key findings reveal that natural convection is crucial in battery heat dissipation. As <em>N</em> and <em>θ</em> escalate, the average integral value of the average velocity generally increases. Furthermore, spiral fins reduce the melting time by a maximum of 2 min compared to straight fins. The influence of the fin rotation angle on the transient heat absorption and power of PCM is relatively small, but it has a significant impact on the battery temperature uniformity. Compared to straight fins, coiled fins can reduce the platform temperature in the heat absorption process. Relative to the former, using <em>N</em> = 3 and <em>θ</em> = 180° can maximally reduce battery temperature by 2.7 °C.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"132 ","pages":"Article 117707"},"PeriodicalIF":8.9,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144685890","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}
{"title":"Optimizing graphene oxide reduction: A multistep approach for enhanced electrochemical performance","authors":"Iman Sengupta , Madhav Prabhakar Chavhan , Suddhapalli S.S. Sharat Kumar , Sudipto Chakraborty , Somenath Ganguly","doi":"10.1016/j.est.2025.117780","DOIUrl":"10.1016/j.est.2025.117780","url":null,"abstract":"<div><div>The present work reduces graphene oxide (GO) using thermal, chemical, and a multistep method by combining both techniques. The effects of reduction methodologies on the structure and electrochemical performance of the reduced graphene oxide (rGO) specimens are investigated. The reduction methodology not only influences the carbon content and intercalation of carbon layers but also significantly affects the porosity features in terms of micro and mesopores, resulting in different electrochemical behaviours. Despite the high surface area of thermally reduced graphene oxide, the absence of micropores and high defect density hinder charge storage. Chemical reduction eliminates epoxy functionalities to partially restore the sp<sup>2</sup> network, promoting charge storage and transport. In contrast, the multistep reduction technique produces appreciable intercalation, eliminates functionalities such as epoxy and hydroxyl to restore the sp<sup>2</sup> network, and introduces significant micropores beneficial to improved charge storage. The specific capacitance of multistep-reduced graphene oxide is found to be five times greater than thermally reduced graphene oxide and two times greater than chemically reduced graphene oxide in a symmetric cell. Furthermore, such a multistep rGO type of cell provides excellent rate capability with stable cyclic performance and delivers a specific energy of 17 Wh kg<sup>−1</sup> at a specific power of 0.9 kW kg<sup>−1</sup>.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"132 ","pages":"Article 117780"},"PeriodicalIF":8.9,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144685892","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}
{"title":"Impact of hydrogen storage on the characteristics and mechanical properties of trona deposits","authors":"Ehsan Dabbaghi , Kam Ng , Tyler C. Brown","doi":"10.1016/j.est.2025.117806","DOIUrl":"10.1016/j.est.2025.117806","url":null,"abstract":"<div><div>Underground hydrogen storage (UHS) represents a promising avenue for storing excess energy for future use. To ensure the safe implementation of this technology, it is crucial to evaluate the potential alterations hydrogen might induce in the host rock. This research studied the impact of hydrogen (H<sub>2</sub>) on the mechanical properties of trona rock collected from Sweetwater County, Wyoming, USA. Twelve cylindrical specimens were prepared: three with a diameter of 25 mm and nine with a diameter of 38 mm. Specimens underwent treatment with gas compositions of 50 %H<sub>2</sub> and 100 %H<sub>2</sub> over two weeks, under 4 MPa of pressure and at room temperature. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) analysis, and both uniaxial and triaxial compression tests were performed. Trona specimens treated with 50 %H<sub>2</sub> and 100 %H<sub>2</sub> exhibited, on average, 14 % and 33 % lower triaxial compressive strength, respectively, than that of untreated specimens. However, the elastic modulus of specimens treated with 50 %H<sub>2</sub> and 100 %H<sub>2</sub> increased by an average of 88 % and 166 %, respectively, compared to untreated specimens. This study shows that the rock's mechanical properties and microstructure are influenced by the reaction between H<sub>2</sub> and trona-related minerals.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"132 ","pages":"Article 117806"},"PeriodicalIF":8.9,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144685887","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}
Johannes Rohwer , Frank Marken , Nico Didcock , Simon Erker , Wolfram Kohs , Helmut Grassberger , Christopher Vagg
{"title":"Impact of battery ageing history on future degradation rates and capacity recovery effects in NMC 622 pouch cells","authors":"Johannes Rohwer , Frank Marken , Nico Didcock , Simon Erker , Wolfram Kohs , Helmut Grassberger , Christopher Vagg","doi":"10.1016/j.est.2025.117690","DOIUrl":"10.1016/j.est.2025.117690","url":null,"abstract":"<div><div>Predicting the state of health (SoH) of Lithium-ion battery cells is essential for optimizing their utilization. Although electrochemical degradation models and data-driven approaches are promising for SoH estimation, they often rely on experiments with repeated idealized cycles and extended relaxation periods, leading to non-robust models for dynamic real-world conditions. This study presents a novel investigation on how different cycling sequences (ageing history) influence future degradation rates and SoH estimation. In a unique experimental design, four identical automotive-grade NMC pouch cells were initially subjected to different accelerated cycling conditions, followed by common protocols until the degradation curve passed its knee point. A detailed analysis was conducted on capacity evolution, swelling and apparent capacity fade. Results indicate that ageing history must be considered in SoH modelling, to achieve robustness under dynamic conditions and improve system safety. Under some conditions, the knee point onset was delayed by at least 50%, while in others, it did not occur at all. Additionally, reversible short-term capacity fade is strongly dependent on the cell’s state, with fresh cells exhibiting a drop of approximately 15% which gradually decreases to around 1% by the end of the test campaign. These findings highlight key considerations for transitioning from laboratory-based to real-world applicable SoH models. Finally swelling shows strong correlation with SoH (<span><math><msup><mrow><mi>R</mi></mrow><mrow><mn>2</mn></mrow></msup></math></span> = 0.97), and is therefore a valuable alternative SoH indicator, especially in online in-service estimation techniques where controlled capacity checks under repeatable conditions are not available.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":"132 ","pages":"Article 117690"},"PeriodicalIF":8.9,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144685895","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}