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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

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Particuology 2023年第10期81卷 162-173页

作者： Xu-Feng Zang Shengchen Yang Ying Zou Yingying Zhang Tao Huang Hui-Ling Xia School of Science Huzhou UniversityHuzhou313000China Department of Engineering Technology Huzhou CollegeHuzhou313000China Laboratory Management Department Huzhou UniversityHuzhou313000China

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.

关键词： Lithium-ion batteries Artificial graphite LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2) Cycle life charge-dischargerate Failure mechanism

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