Stability of Li2CO3 in cathode of lithium ion battery and its influence on electrochemical performance

Yujing Bi; Tao Wang; Meng Liu; Rui Du; Wenchao Yang; Zixuan Liu; Zhe Peng; Yang Liu; Deyu Wang; Xueliang Sun

doi:10.1039/C6RA00648E

Stability of Li₂CO₃ in cathode of lithium ion battery and its influence on electrochemical performance

Yujing Bi,^abd Tao Wang,^c Meng Liu,^a Rui Du,^ab Wenchao Yang,^a Zixuan Liu,^a Zhe Peng,^a Yang Liu,^a Deyu Wang*^a and Xueliang Sun^d

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* Corresponding authors

^a Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, China
E-mail: wangdy@nimte.ac.cn

^b University of Chinese of Academy of Sciences, Beijing, China

^c Shanghai Institute of Space Power Source, Shanghai, China

^d Nanomaterial and Energy Lab, Department of Mechanical and Materials Engineering, University of Western Ontario, London, Ontario, Canada

Abstract

Lithium carbonate is an unavoidable impurity at the cathode side. It can react with LiPF₆-based electrolyte and LiPF₆ powder to produce LiF and CO₂, although it presents excellent electrochemical inertness. Samples of Li₂CO₃-coated and LiF-coated LiNi_0.8Co_0.1Mn_0.1O₂ were prepared to compare their influence on a cathode's behavior. After 200 cycles at 1C, in contrast to 37.1% of capacity retention for the Li₂CO₃-coated material, the LiF-coated LiNi_0.8Co_0.1Mn_0.1O₂ retained 91.9% of its initial capacity, which is similar to the fresh sample. This demonstrates that decomposition of Li₂CO₃ can seriously deteriorate cyclic stability if this occurs during working.

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Stability of Li₂CO₃ in cathode of lithium ion battery and its influence on electrochemical performance

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Stability of Li₂CO₃ in cathode of lithium ion battery and its influence on electrochemical performance

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