Materials Today Energy最新文献

Surface phase stability of high-nickel layered oxides by titanium and sulfur co-modifications 通过钛和硫共同修饰实现高镍层状氧化物的表面相稳定性

IF 9.3 2区材料科学

Materials Today Energy Pub Date : 2024-08-22 DOI: 10.1016/j.mtener.2024.101676

Jianping Xie, Zhengwei Fan, Dongdong Mao, Pian Zhang, Sai Su, Yijia Qin, Junwei Zhang, Lisha Yan, Yongxin Zhang, Hanfu Wang, Luting Song, Peipei Chen, Weiguo Chu

{"title":"Surface phase stability of high-nickel layered oxides by titanium and sulfur co-modifications","authors":"Jianping Xie, Zhengwei Fan, Dongdong Mao, Pian Zhang, Sai Su, Yijia Qin, Junwei Zhang, Lisha Yan, Yongxin Zhang, Hanfu Wang, Luting Song, Peipei Chen, Weiguo Chu","doi":"10.1016/j.mtener.2024.101676","DOIUrl":"https://doi.org/10.1016/j.mtener.2024.101676","url":null,"abstract":"High-nickel layered oxides are promising cathodes for lithium-ion batteries due to relatively high capacity and low cost, which however are still faced with safety issues because of poor stability against cycling. Herein, a facile one-pot solid-state method is employed for preparation of trace Ti/S co-doped LiNiCoO. Ti and S co-doping enhances both rate capability and intrinsic stability greatly in a mutually promoting manner compared with individual Ti and S doping. The co-doped samples show excellent rate capability with 170.9 mAh/g at 5 C and superior intrinsic stability with a capacity retention of 88.6% at 1 C after 200 cycles at room temperature, in sharp contrast with 132.2 mAh/g and 61.6% for the pristine samples. Full cells achieve excellent long-term stability with a retention of 92.7% after 400 cycles at 1 C. The improved performance can be ascribed to the formation of stronger Ti–O bonds and of a thin rock-salt protective layer enabled by sulfur with the stability enhanced by Ti modifications, and the activation of extra redox reactions triggered by sulfur. The mutually promoting enhancement effect by doping different alien elements opens a new and unique design strategy for performance improvement of electrode materials.","PeriodicalId":18277,"journal":{"name":"Materials Today Energy","volume":null,"pages":null},"PeriodicalIF":9.3,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142188280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanochemistry induced mixed ionic/electronic conductive interphase enabling dendrite-free lithium metal anodes 机械化学诱导的混合离子/电子导电相，实现无树枝状突起的锂金属阳极

IF 9.3 2区材料科学

Materials Today Energy Pub Date : 2024-08-22 DOI: 10.1016/j.mtener.2024.101675

Wen Pan, Shaozhen Huang, Kecheng Long, Xinsheng Liu, Piao Qing, Haoling Liu, Yunke Jin, Yuxin Chen, Huimiao Li, Lin Mei, Zhibin Wu, Libao Chen

{"title":"Mechanochemistry induced mixed ionic/electronic conductive interphase enabling dendrite-free lithium metal anodes","authors":"Wen Pan, Shaozhen Huang, Kecheng Long, Xinsheng Liu, Piao Qing, Haoling Liu, Yunke Jin, Yuxin Chen, Huimiao Li, Lin Mei, Zhibin Wu, Libao Chen","doi":"10.1016/j.mtener.2024.101675","DOIUrl":"https://doi.org/10.1016/j.mtener.2024.101675","url":null,"abstract":"High-energy-density lithium metal batteries have shown promising applications in drones and electrical vehicles. However, the growth of lithium dendrites and the formation of unstable solid electrolyte interphase (SEI) become the main factors restricting their development. In this study, dendrite-free lithium metal anodes (ZB@Li) were developed with ionic/electronic conductive interface layers by a solvent-free mechanochemical method. By rubbing zinc borate (ZB) powder on lithium foil, a mixed interface layer is formed with the generation of lithium borate phase and the Li–Zn alloy phase. The lithium borate phase provides a low diffusion energy barrier and high ionic conductivity for sufficient potential gradient to induce rapid deposition of ions on the interface layer. The Li–Zn alloy phase owns the lithiophilic characteristic and a high electronic conductivity. The combination of the two phases provides mixed ions/electrons paths with enhanced transport kinetics and realize uniform and planar deposition of lithium. As a result, the ZB@Li symmetrical cell exhibits a prolonged cycling performance of over 4,200 h and the ZB@Li||LFP (LFP= lithium iron phosphate [LiFePO]) full cell shows a long cycle life for more than 500 cycles at 2 C with a high capacity retention rate of 84.6% at a high loading mass of 10 mg/cm.","PeriodicalId":18277,"journal":{"name":"Materials Today Energy","volume":null,"pages":null},"PeriodicalIF":9.3,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142188281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The preferential orientation controlling for efficient Sb2S3 and low Se content Sb2SeyS3-y indoor photovoltaics 控制高效 Sb2S3 和低 Se 含量 Sb2SeyS3-y 室内光伏的优先取向

IF 9.3 2区材料科学

Materials Today Energy Pub Date : 2024-08-21 DOI: 10.1016/j.mtener.2024.101670

Guiju Hu, Chengwu Shi, Bo Yang, Zihao Wang, Kai Lv, Yanqing Wang, Fuling Guo, Wangchao Chen

{"title":"The preferential orientation controlling for efficient Sb2S3 and low Se content Sb2SeyS3-y indoor photovoltaics","authors":"Guiju Hu, Chengwu Shi, Bo Yang, Zihao Wang, Kai Lv, Yanqing Wang, Fuling Guo, Wangchao Chen","doi":"10.1016/j.mtener.2024.101670","DOIUrl":"https://doi.org/10.1016/j.mtener.2024.101670","url":null,"abstract":"SbS is a promising absorber material for indoor photovoltaics due to the appropriate direct bandgap of 1.75 eV, high element abundance, low toxicity, stability, and single phase. Considering the indoor lighting irradiance is very low and the resulting carrier numbers are relatively less and SbS is quasi-one-dimensional crystal structure, the preferential orientation controlling of SbS is very important to improve the power conversion efficiency (PCE) of SbS indoor photovoltaics. Herein, SbS and low Se content SbSeS films are prepared by chemical bath deposition and the preferential orientation of SbS films is controlled by introducing SbCl and selenourea in the growth solution. The uniformity of the S and Se distribution in low Se content SbSeS films is adjusted by introducing EDTA-2Na. Using the warm white LED with a color temperature of 3347 K and illuminance of 1000 lux, SbS and low Se content SbSeS indoor photovoltaics achieve the PCE of 16.58% for SbS and 17.62% for SbSeS, which is the highest PCE for antimony chalcogenide indoor photovoltaics. Therefore, the preferential orientation controlling by introducing SbCl and selenourea into the growth solution is an efficient strategy for fabricating high-efficiency SbS and low Se content SbSeS indoor photovoltaics.","PeriodicalId":18277,"journal":{"name":"Materials Today Energy","volume":null,"pages":null},"PeriodicalIF":9.3,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142188282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Visible light-driven photoreforming of polystyrene segmented glycopolymer architectures for enhanced hydrogen generation 可见光驱动聚苯乙烯分段糖聚合物结构的光再形成，以提高制氢能力

IF 9.3 2区材料科学

Materials Today Energy Pub Date : 2024-08-15 DOI: 10.1016/j.mtener.2024.101667

Dattatray Namdev Sutar, Sandip Prabhakar Shelake, Nagamalleswara Rao Indla, Sagar Varangane, Annadanam V. Sesha Sainath, Ujjwal Pal

{"title":"Visible light-driven photoreforming of polystyrene segmented glycopolymer architectures for enhanced hydrogen generation","authors":"Dattatray Namdev Sutar, Sandip Prabhakar Shelake, Nagamalleswara Rao Indla, Sagar Varangane, Annadanam V. Sesha Sainath, Ujjwal Pal","doi":"10.1016/j.mtener.2024.101667","DOIUrl":"https://doi.org/10.1016/j.mtener.2024.101667","url":null,"abstract":"In this report, a series of polystyrene segmented new glycopolymer architectures are synthesized, which are utilized in the photoreforming process to achieve a remarkable rate of hydrogen production. The primary building blocks of mono-, bi-, and tetra-functional photo-iniferter were employed in the RAFT polymerization process to design a series of block copolymer architectures using styrene and acetylated glucose methacrylate monomers. Acetylated polymer architectures exhibited higher thermal stability compared to deacetylated polymers. Deacetylated polymers showed lower T values than the acetylated polymers. In addition, a wide range of T values (55–96 °C) and variations in the T values of the acetylated polymers indicate the dependence on the nature of the pendant unit and macromolecular architecture. The deacetylated macromolecule, 1A-PS--PGM diblock copolymer exhibits a hydrogen generation rate of ∼753 μmol/g/h with an AQY of ∼1.84% compared to that of the polystyrene segment alone (53 μmol/g/h, AQY of ∼0.02%). Within the range of possible synthesized glycopolymer architectures, linear and glucose-based triblock glycopolymers show promising activity. The kinetics of the water-splitting reaction are influenced by adjustments to both the solution's pH and the hydrophilicity of the glycomacromolecular chains.","PeriodicalId":18277,"journal":{"name":"Materials Today Energy","volume":null,"pages":null},"PeriodicalIF":9.3,"publicationDate":"2024-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142188321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Designing delafossite CuAl1-xTMxO2 solid solutions: the role of 3d transition metal spin states in photo(electro)catalytic performance 设计delafossite CuAl1-xTMxO2固溶体：3d过渡金属自旋态在光（电）催化性能中的作用

IF 9.3 2区材料科学

Materials Today Energy Pub Date : 2024-08-14 DOI: 10.1016/j.mtener.2024.101669

Xian-Lan Chen, Bao-Feng Shan, Zong-Yan Zhao

{"title":"Designing delafossite CuAl1-xTMxO2 solid solutions: the role of 3d transition metal spin states in photo(electro)catalytic performance","authors":"Xian-Lan Chen, Bao-Feng Shan, Zong-Yan Zhao","doi":"10.1016/j.mtener.2024.101669","DOIUrl":"https://doi.org/10.1016/j.mtener.2024.101669","url":null,"abstract":"This study delves into the effects of 3d transition metal (TM) spin states on the structural and electronic properties of CuAlTMO solid solutions, focusing on their implications for photo(electro)catalytic performance. The research reveals that the Jahn–Teller distortion, associated with TM, is a critical factor in determining the lattice parameters and photo(electro)catalytic performances. Solid solutions without Jahn–Teller distortion adhere to Vegard's law, whereas those with strong distortion exhibit deviations, indicating the influence of TMO octahedral distortion on solubility and lattice parameters. The electronic structure of solid solutions with weak Jahn–Teller distortion is governed by the O–Cu–O and TMO crystal fields, which leads to a narrowed bandgap and reduced conduction band minimum (CBM), impacting the hydrogen evolution potential. In particular, the CuAlCrO shows a significant enhancement in photocurrent density and hydrogen production rate due to its balanced light absorption and effective charge carrier separation. In contrast, the weak Jahn–Teller distortion in CuAlFeO results in localized electronic states at CBM, leading to diminished carrier mobility. Solid solutions with strong Jahn–Teller distortion, such as CuAlTMO (TM = Mn and Ni), display a range of electronic properties from semiconductor to semimetallic, with the semimetallic CuAlMnO capable of infrared light absorption and efficient photocatalytic hydrogen and oxygen production.","PeriodicalId":18277,"journal":{"name":"Materials Today Energy","volume":null,"pages":null},"PeriodicalIF":9.3,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142188322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nitrogen-rich nanoporous carbon with MXene composite for high-performance Zn-ion hybrid capacitors 用于高性能 Zn 离子混合电容器的富氮纳米多孔碳与 MXene 复合材料

IF 9.3 2区材料科学

Materials Today Energy Pub Date : 2024-08-14 DOI: 10.1016/j.mtener.2024.101671

Doudou Zhao, Da Xu, Tiantian Wang, Zhenglong Yang

{"title":"Nitrogen-rich nanoporous carbon with MXene composite for high-performance Zn-ion hybrid capacitors","authors":"Doudou Zhao, Da Xu, Tiantian Wang, Zhenglong Yang","doi":"10.1016/j.mtener.2024.101671","DOIUrl":"https://doi.org/10.1016/j.mtener.2024.101671","url":null,"abstract":"The zinc-ion hybrid capacitor, as a novel energy storage system with outstanding electrochemical performance, low cost, and high safety, has attracted widespread research attention. In this work, we report a hetero-structured composite material, CN@MXene, obtained by alternately stacking porous carbon material CN with MXene nanosheets. Theoretical calculations and a series of characterizations reveal that the introduction of MXene nanosheets not only exposes more active sites of CN, but also significantly enhances the conductivity and stability of the overall composite material, thereby achieving excellent electrochemical energy storage performance. Consequently, as a cathode material for zinc-ion hybrid capacitors, CN @MXene achieves a high specific capacity of 240 mA h/g at 0.1 A/g and exhibits outstanding rate performance from 1 to 20 A/g. And the capacitance retention rate remains as high as 94%, after 10,000 cycles of charge-discharge at a current density of 5 A/g. Moreover, based on the CN @MXene electrode, flexible zinc ion micro-capacitor with high area-specific capacity of 264 mF/cm was fabricated using laser cutting technology. We believe that this work provides new research strategies for developing high-performance zinc-ion hybrid capacitors.","PeriodicalId":18277,"journal":{"name":"Materials Today Energy","volume":null,"pages":null},"PeriodicalIF":9.3,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142188323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Core-shell nanofiber separator incorporated with PDA-PEI co-modified Li0.33La0.57TiO3 nanowires prepared by co-axial electrospinning for dendrite-free lithium metal batteries 通过共轴电纺丝法制备的、含有 PDA-PEI 共修饰 Li0.33La0.57TiO3 纳米线的核壳纳米纤维隔膜，用于无枝晶型锂金属电池

IF 9.3 2区材料科学

Materials Today Energy Pub Date : 2024-08-14 DOI: 10.1016/j.mtener.2024.101672

Jaeseon Lee, Jinsoo Yoon, Seong-Geun Oh

{"title":"Core-shell nanofiber separator incorporated with PDA-PEI co-modified Li0.33La0.57TiO3 nanowires prepared by co-axial electrospinning for dendrite-free lithium metal batteries","authors":"Jaeseon Lee, Jinsoo Yoon, Seong-Geun Oh","doi":"10.1016/j.mtener.2024.101672","DOIUrl":"https://doi.org/10.1016/j.mtener.2024.101672","url":null,"abstract":"The core-shell nanofibers containing PDA-PEI co-modified LiLaTiO (LLTO) perovskite nanowires in the shell layer were fabricated by co-axial electrospinning technique to apply as separator in dendrite-free lithium metal batteries. The PVDF-HFP with good mechanical properties and polar C–F bonds was used as the core material, and polyacrylonitrile (PAN) with high thermal stability was employed as the shell layer in nanofibers. The PDA-PEI co-modified LiLaTiO nanowires, reacting with PF anions in LiPF salt can not only capture free anions but also provide a lithium-ion migration pathway. Moreover, the core-shell structured nanofibers exhibited high mechanical strength (9.2 N/mm), robust thermal stability (>0% at 200 °C for 1 h), and favorable electrolyte affinity (electrolyte uptake of 732%). Gelation of PVDF-HFP in liquid electrolyte leads to high-ionic conductivity (3.52 mS/cm), Li transference number (t = 0.68), uniform Li flux, and smooth Li deposition. The Li plating/stripping test consisting of Li–Li cells (with CS/LLTO-PDA-PEI) carried out at 0.4 mA/cm was conducted for 1000 h without a short circuit. NCM-Li and NCM-Gr coin cells using the CS (core-shell)/LLTO-PDA-PEI separator retained long-term cycle stability and good Coulombic efficiency (CE).","PeriodicalId":18277,"journal":{"name":"Materials Today Energy","volume":null,"pages":null},"PeriodicalIF":9.3,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142188436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

One-pot in situ synthesis of ZIF particles to prepare thin-film nanocomposite membranes for CO2 separation 一锅原位合成 ZIF 颗粒，制备用于二氧化碳分离的薄膜纳米复合膜

IF 9.3 2区材料科学

Materials Today Energy Pub Date : 2024-08-13 DOI: 10.1016/j.mtener.2024.101665

Yulei Ma, Jing Wei, Liujie Xu, Yuanfa Zhuang, Ya Huang, Lin Yang, Lu Yao, Wenju Jiang, Zhongde Dai

{"title":"One-pot in situ synthesis of ZIF particles to prepare thin-film nanocomposite membranes for CO2 separation","authors":"Yulei Ma, Jing Wei, Liujie Xu, Yuanfa Zhuang, Ya Huang, Lin Yang, Lu Yao, Wenju Jiang, Zhongde Dai","doi":"10.1016/j.mtener.2024.101665","DOIUrl":"https://doi.org/10.1016/j.mtener.2024.101665","url":null,"abstract":"Mixed matrix membranes (MMMs) are more likely to break the Robeson upper bound because they combine the pros of both organic and inorganic membranes. However, in the conventional MMM preparation processes, multi-steps are normally needed and, in many cases, the particle agglomeration and consequent non-selective voids are unavoidable, resulting in poor carbon dioxide (CO) separation performances. In addition, the agglomeration makes it challenging to fabricate thin-film nanocomposite (TFN) membranes. In this study, zeolitic imidazolate framework (ZIF)-8- and ZIF-67-based TFN membranes were fabricated via a facile one-pot in situ synthesis protocol. The ZIF particles were synthesized in the polymeric solution, then the TFN membranes were fabricated by a dip coating method. With a casting solution concentration of 1.5 %, a selective layer with a thickness of ∼300 nm can be prepared on the porous polyacrylonitrile (PAN) support. The results of thermogravimetric analysis (TGA), differential scanning calorimeter (DSC), Fourier Transform Infrared (FT-IR) spectroscopy, and X-ray diffraction (XRD) showed that ZIFs were successfully synthesized in the casting solution. At 35 °C and 2 bar, the membrane containing 5 % ZIF-67 had a CO permeance of 223.35 gas permeation unit (GPU), which was 16.55 % higher than that of pure Pebax.","PeriodicalId":18277,"journal":{"name":"Materials Today Energy","volume":null,"pages":null},"PeriodicalIF":9.3,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142188324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Stabilizing sodium metal anodes by functional polymers 用功能聚合物稳定钠金属阳极

IF 9.3 2区材料科学

Materials Today Energy Pub Date : 2024-08-10 DOI: 10.1016/j.mtener.2024.101664

Jingmiao Jia, Bin Guo, Huawei Gao, Yanwei Zhao, Guojie Li, Aoxuan Wang, Chuntai Liu

{"title":"Stabilizing sodium metal anodes by functional polymers","authors":"Jingmiao Jia, Bin Guo, Huawei Gao, Yanwei Zhao, Guojie Li, Aoxuan Wang, Chuntai Liu","doi":"10.1016/j.mtener.2024.101664","DOIUrl":"https://doi.org/10.1016/j.mtener.2024.101664","url":null,"abstract":"With the development of the next-generation energy storage systems, rechargeable secondary batteries that improve energy density and safety are necessary to achieve energy iteration. Because of their low cost and high energy density, sodium metal batteries (SMBs) have great potential in the future. However, due to the instability of the solid electrolyte interface (SEI), the growth of sodium dendrites, and the volume expansion of the sodium metal anodes (SMAs) during planting and stripping, its practical implementation is hindered. In recent years, with the deepening of polymer chemistry research, polymers have been widely used to improve the batteries’ actual performance, safety, and durability as a result of their strong chemical stability, processability, structural designability, and functional diversity. Based on the basic understanding of the relationship between polymer structure and properties, polymer design and common processing methods of stable SMAs are systematically summarized. Furthermore, the strategies of polymers to stabilize SMAs were reviewed from five aspects: artificial SEI, separators, gel polymer electrolytes, solid polymer electrolytes, and anode hosts. The current research status and difficulties in optimizing SMAs to achieve high stability are discussed. Finally, the challenges and potential development directions of SMAs are discussed.","PeriodicalId":18277,"journal":{"name":"Materials Today Energy","volume":null,"pages":null},"PeriodicalIF":9.3,"publicationDate":"2024-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142188474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Off-stoichiometric design of a manganese-rich mixed olivine Li-ion cathode for improved specific energy 改进比能量的富锰混合橄榄石锂离子阴极的非化学计量设计

IF 9.3 2区材料科学

Materials Today Energy Pub Date : 2024-08-09 DOI: 10.1016/j.mtener.2024.101658

Angel Burgos, Junteng Du, Danna Yan, Yazhou Zhou, Hannah Levy, Jeong Gi Ryu, Jae Chul Kim

{"title":"Off-stoichiometric design of a manganese-rich mixed olivine Li-ion cathode for improved specific energy","authors":"Angel Burgos, Junteng Du, Danna Yan, Yazhou Zhou, Hannah Levy, Jeong Gi Ryu, Jae Chul Kim","doi":"10.1016/j.mtener.2024.101658","DOIUrl":"https://doi.org/10.1016/j.mtener.2024.101658","url":null,"abstract":"Lithium phospho-olivine cathodes operating with iron (Fe) and manganese (Mn) redox centers are considered technologically important materials that can make the development of Li-ion batteries sustainable. Although large Mn content is desirable to achieve high specific energy at a material level, the mixed olivine cathodes require particle nanostructuring and post-synthesis treatment to demonstrate reasonable energy storage properties at an electrode level. In this work, we have investigated the effect of off-stoichiometry on the electrochemical properties of a Mn-rich mixed olivine cathode material that does not require complex optimization processing. An off-stoichiometric form of LiFeMnPO is synthesized with nominal composition of LiFeMnPO. X-ray diffraction and electron microscopy indicate that off-stoichiometry leads to phase separation into stoichiometric LiFeMnPO crystalline particles with non-crystalline surface phases. The off-stoichiometric cathode has an improved specific energy of 622 Wh/kg at C/5, outperforming the stoichiometric cathode. The off-stoichiometric cathode also exhibits improved rate capability, delivering 120 mAh/g at 20C and 78 mAh/g at 40C discharge, respectively, due to reduced interfacial and charge transfer resistances. This work highlights off-stoichiometry as an effective approach to engineer Mn-rich mixed olivine cathode materials with desirable electrochemical properties, providing a practically feasible route for materials optimization.","PeriodicalId":18277,"journal":{"name":"Materials Today Energy","volume":null,"pages":null},"PeriodicalIF":9.3,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142188325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0