锂离子电池寄生反应的动力学研究：以 LiNi(0.6)Mn(0.2)Co(0.2)O2 为例。
Kinetic Study of Parasitic Reactions in Lithium-Ion Batteries: A Case Study on LiNi(0.6)Mn(0.2)Co(0.2)O2.
机构信息
Chemical Sciences and Engineering Division, Argonne National Laboratory , 9700 South Cass Avenue, Argonne, Illinois 60439, United States.
Materials Science Division, Argonne National Laboratory , 9700 South Cass Avenue, Argonne, Illinois 60439, United States.
出版信息
ACS Appl Mater Interfaces. 2016 Feb 10;8(5):3446-51. doi: 10.1021/acsami.5b11800. Epub 2016 Jan 29.
The side reactions between the electrode materials and the nonaqueous electrolytes have been the major contributor to the degradation of electrochemical performance of lithium-ion batteries. A home-built high-precision leakage current measuring system was deployed to investigate the reaction kinetics between the delithiated LiNi(0.6)Mn(0.2)Co(0.2)O2 and a conventional nonaqueous electrolyte. It was found that the rate of parasitic reaction had strong dependence on the upper cutoff potential of the cathode material. The kinetic data also indicated a change of reaction mode at about 4.5 V vs Li(+)/Li.
电极材料与非水电解质之间的副反应是导致锂离子电池电化学性能下降的主要原因。本研究采用自行搭建的高精度漏电电流测试系统，研究了脱锂态 LiNi(0.6)Mn(0.2)Co(0.2)O2 与常规非水电解质之间的反应动力学。结果表明，寄生反应的速率强烈依赖于正极材料的截止电压上限。动力学数据还表明，在相对于 Li(+)/Li 为 4.5 V 左右时，反应模式发生了变化。
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