科学研究

LMO和NMC混合正极锂离子电池失效分析

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  • 广汽集团汽车工程研究院,广州 510640
胡利芬(1979-),女,硕士,高级工程师,主要从事材料失效分析,E-mail: hulifen@gacrnd.com。

网络出版日期: 2020-12-07

Failure analysis of lithium-ion battery with LMO+NMC blended positive electrode

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  • Ltd Automotive Engineering Institute,Guangzhou Automobile Group Co.,Guangzhou 510640

Online published: 2020-12-07

摘要

以活性材料锰酸锂(LMO)和镍钴锰酸锂(NMC)为正极,石墨为负极制成锂离子电池,并对电池进行循环寿命测试。采用X射线衍射(XRD)、扫描电镜(SEM)和电感耦合等离子体发射光谱(ICP-OES)等方法研究电池循环容量的衰减情况。结果表明:随着循环次数增加,极片脱落,掉粉,混合正极材料LMO中Mn溶出,NMC中Ni和Co溶解。混合正极材料的这些变化可能是造成电池循环容量衰减的主要原因。针对上述原因对混合正极的质量控制提出了建议。

本文引用格式

胡利芬 . LMO和NMC混合正极锂离子电池失效分析[J]. 化工新型材料, 2020 , 48(11) : 132 -134 . DOI: 10.19817/j.cnki.issn 1006-3536.2020.11.029

Abstract

Lithium-ion batteries were made of LMO and NMC cathode and graphite anode.Cycling life was tested.The cause of battery capacity loss was studied by means of XRD,SEM and ICP-OES.The results shown that with the increase of cycling,the pole piece had dropped and peeled.Mn in LMO had dissoluted.Ni and Co in NMC had also dissoluted.These changes of blended positive electrode may be the main cause of capacity loss during cycling test.The quality control suggestions of the blended positive electrode were proposed according to above reasons.

参考文献

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