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 reported.However,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 cells.Herein,a∼1.9 Ah NCM523/AG pouch cell is employed,whose electrochemical and structural evolutions after 800 cycles at various rates are comprehensively investigated.We find that cycling performances are strongly influenced by charge rate,followed by limit current and discharge rate.The 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 rate.Possible failure reasons are analyzed by advanced characterizations.Results reveal that NCM523 cathodes of the cells deteriorated early experience severe transition metal dissolution,lattice distortion,and partial phase transformation.Meanwhile,the deposited transition metals on AG anodes catalyze the electrolyte consumption,lithium plating and active area loss.Finally,these side reactions notably increase cell impedance and electrochemical polarization.Undoubtedly,these findings clearly outline the challenges and optimization direction for high-rate NCM523/AG cells.