Revealing the correlation between structural evolution and long-term cyclability of the LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)/artificial graphite pouch cells at various rates

作     者：Xu-Feng Zang Shengchen Yang Ying Zou Yingying Zhang Tao Huang Hui-Ling Xia Xu-Feng Zang;Shengchen Yang;Ying Zou;Yingying Zhang;Tao Huang;Hui-Ling Xia

作者机构：School of ScienceHuzhou UniversityHuzhou313000China Department of Engineering TechnologyHuzhou CollegeHuzhou313000China Laboratory Management DepartmentHuzhou UniversityHuzhou313000China 

出 版 物：《Particuology》 (颗粒学报(英文版))

年 卷 期：2023年第81卷第10期

页      面：162-173页

核心收录：

学科分类：0710[理学-生物学] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：We thank the Natural Science Foundation of Zhejiang Province,China(grant Nos.LQ21B030004 and LQ21E040001) the National Natural Science Foundation of China(grant No.12147219) 

主　　题：Lithium-ion batteries Artificial graphite LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2) Cycle life Charge-dischargerate Failure mechanism 

摘      要：In recent years,researches on improving high-voltage performance of lithium-ion batteries incorporating LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)(NCM523)and artificial graphite(AG)have been widely ***,limited attentions have been paid to understand the effects and influence mechanisms of charge and discharge rates and charge limit currents on cyclability of NCM523/AG ***,a∼1.9 Ah NCM523/AG pouch cell is employed,whose electrochemical and structural evolutions after 800 cycles at various rates are comprehensively *** find that cycling performances are strongly influenced by charge rate,followed by limit current and discharge *** cell charged at a high rate and cell charged until reaching a low limit current both exhibit low capacity retentions compared to the cell discharged at a high *** failure reasons are analyzed by advanced *** reveal that NCM523 cathodes of the cells deteriorated early experience severe transition metal dissolution,lattice distortion,and partial phase ***,the deposited transition metals on AG anodes catalyze the electrolyte consumption,lithium plating and active area ***,these side reactions notably increase cell impedance and electrochemical ***,these findings clearly outline the challenges and optimization direction for high-rate NCM523/AG cells.