Enhancing the long-term cycling stability of Ni-rich cathodes via regulating the length/width ratio of primary particle

被引:7
作者
Han, Duzhao [1 ]
Zhang, Jilu [1 ]
Yang, Mingyu [1 ]
Xie, Keyu [2 ]
Peng, Jiali [3 ]
Dolotko, Oleksandr [3 ]
Huang, Cheng [4 ]
Wu, Yuping [5 ]
Shao, Le [6 ]
Hua, Weibo [1 ]
Tang, Wei [1 ]
机构
[1] Xi An Jiao Tong Univ, Sch Chem Engn & Technol, 28 West Xianning Rd, Xian 710049, Shaanxi, Peoples R China
[2] Northwestern Polytech Univ, Sch Mat Sci & Engn, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
[3] Karlsruhe Inst Technol KIT, Inst Appl Mat IAM, D-76344 Eggenstein Leopoldshafen, Germany
[4] Guangdong Jiana Energy Technol Co Ltd, Guangzhou 511449, Guangdong, Peoples R China
[5] Southeast Univ, Sch Energy & Environm, Nanjing 210096, Jiangsu, Peoples R China
[6] Shaanxi Coal Chem Ind Technol Res Inst Co Ltd, Xian 710049, Shaanxi, Peoples R China
来源
ENERGY MATERIALS | 2024年 / 4卷 / 01期
基金
国家重点研发计划; 中国国家自然科学基金;
关键词
Ni-rich layered oxide; primary particle length/width ratio; long-term cycling; microcracks; cycling stability; HIGH-ENERGY;
D O I
10.20517/energymater.2023.59
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Ni-rich layered oxide cathode materials are promising candidates for high-specific-energy battery systems owing to their high reversible capacity. However, their widespread application is still severely impeded by severe capacity loss upon long-term cycling. It has been proven that the cyclic stability of Ni-rich cathode materials is closely related to their microstructure and morphology. Despite this, the influence of the microstructure of primary particles on the fatigue mechanism of Ni-rich cathode materials during prolonged cycling has not been fully understood. Here, two Ni-rich layered spherical agglomerate oxides consisting of the primary particle with different length/width ratios are successfully synthesized. It is found that the long-term structural stability of both materials strongly depends on the microstructure of primary crystallites, although there is no significant difference between the electrochemical and crystalline characteristics during the initial cycle. A higher primary particle length/width ratio could effectively inhibit the accumulation of microcracks and chemical degradation during long-term cycling, thereby promoting the electrochemical performance of the cathode materials (80% capacity retention after 200 cycles at 1 C compared to the 55% of the counterpart with a lower primary particle length/width ratio). This study highlights the structure -activity relationship between the primary particle microstructure and fatigue mechanisms during long-term cycling, thereby advancing the development of Ni-rich cathode materials.
引用
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页数:13
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