Exploring high-voltage fluorinated carbonate electrolytes for LiNi0.5Mn1.5O4 cathode in Li-ion batteries

被引：8

作者：

Xi Zheng ^{[1
]}

Ying Liao ^{[1
]}

Zhongru Zhang ^{[1
]}

Jianping Zhu ^{[1
]}

Fucheng Ren ^{[2
]}

Huajin He ^{[1
]}

Yuxuan Xiang ^{[1
]}

Yezhen Zheng ^{[1
]}

Y.Yang ^{[1
,2
]}

机构：

[1] State Key Laboratory for Physical Chemistry of Solid Surfaces,Collaborative Innovation Center of Chemistry for Energy Materials (iChEM),and Department of Chemistry,College of Chemistry and Chemical Engineering,Xiamen University

[2] College of Energy,Xiamen University

来源：

Journal of Energy Chemistry | 2020年 / 03期

基金：

中国国家自然科学基金;

关键词：

Fluorinated solvent; High voltage electrolyte; LiNi0.5Mn1.5O4; Interphase film; Additive; Lithium-ion batteries;

D O I：

暂无

中图分类号：

TM912 [蓄电池]; O646.1 [电解质溶液理论];

学科分类号：

0808 ; 081704 ;

摘要：

Ethyl-（2,2,2-trifluoroethyl）carbonate（ETFEC）is investigated as a solvent component in high-voltage electrolytes for LiNiMnO（LNMO）.Our results show that the self-discharge behavior and the high temperature cycle performance can be significantly improved by the addition of 10% ETFEC into the normal carbonate electrolytes,e.g.,the capacity retention improved from 65.3% to 77.1% after 200 cycles at 60℃.The main reason can be ascribed to the high stability of ETFEC which prevents large oxidation of the electrolyte on the cathode surface.In addition,we also explore the feasibility of electrolytes using single fluoriated-solvents with and without additives.Our results show that the cycle performance of LNMO material can be greatly improved in 1 MLiPF+ pure ETFEC-solvent system with 2 wt% ethylene carbonate（EC）or ethylene sulfate（DTD）.The capacity retention of the LNMO materials is 93% after 300 cycles,even better than that of carbonate-based electrolytes.It is shown that the additives are oxidized on the surface of LNMO particles and contribute to the formation of cathode/electrolyte interphase（CEI）films.This composite CEI film plays a crucial role in suppressing the serious decomposition of the electrolyte at high voltage.

引用

页码：62 / 70

页数：9

共 3 条

[1] S.Tan,Y.J.Ji,Z.R.Zhang,Y.Yang. Chemphyschem . 2014
[2] J H Wang,Y Yamada,K Sodeyama et al. Nat. Commun . 2016
[3] V. Barone,and M. Cossi. J. Phys. Chem. A . 1998

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