Concentrated electrolyte boosting high-temperature cycling stability of LiCoO2/graphite cell

Min Zhang; Jianjun Zhang; Jinfeng Yang; Jianhua Yao; Zheng Chen; Chenglong Lu; Xiaofan Du; Zhongyi Zhang; Hui Zhang; Guanglei Cui

doi:10.1039/c9cc03246k

Concentrated electrolyte boosting high-temperature cycling stability of LiCoO₂/graphite cell

Chem Commun (Camb). 2019 Aug 13;55(66):9785-9788. doi: 10.1039/c9cc03246k.

Authors

Min Zhang¹, Jianjun Zhang, Jinfeng Yang, Jianhua Yao, Zheng Chen, Chenglong Lu, Xiaofan Du, Zhongyi Zhang, Hui Zhang, Guanglei Cui

Affiliation

¹ College of Material Science and Engineering, Qingdao University, No. 308 Ningxia Road, Qingdao 266071, P. R. China. [email protected].

PMID: 31355842
DOI: 10.1039/c9cc03246k

Abstract

We report a strategy employing a concentrated electrolyte to boost the cycling stability of LiCoO2/graphite cells at 90 °C for the first time. Such a concentrated electrolyte provides the cells with superb cycling stability (97% after 160 cycles) at 90 °C. Further investigations unveil that the concentrated electrolyte participates in the formation of a compact LiF-rich CEI layer, which effectively inhibits the decomposition of electrolyte solvent and the dissolution of Co2+, maintaining the structural integrity of the LiCoO2 cathode.