Interface Modifications by Tris(2,2,2-trifluoroethyl) Borate for Improving the High-Voltage Performance of LiNi1/3Co1/3Mn1/3O2 Cathode

Research Article | Journal of The Electrochemical Society
Interface Modifications by Tris(2,2,2-trifluoroethyl) Borate for Improving the High-Voltage Performance of LiNi_1/3Co_1/3Mn_1/3O₂ Cathode
Author's Information

Long Wang

MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, Harbin Institute of Technology, Harbin 150001, People`s Republic of China

Yulin Ma

MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, Harbin Institute of Technology, Harbin 150001, People`s Republic of China

Panpan Wang

School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People`s Republic of China

Shuaifeng Lou

MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, Harbin Institute of Technology, Harbin 150001, People`s Republic of China

Xinqun Cheng

MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, Harbin Institute of Technology, Harbin 150001, People`s Republic of China

Pengjian Zuo

MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, Harbin Institute of Technology, Harbin 150001, People`s Republic of China

Chunyu Du

MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, Harbin Institute of Technology, Harbin 150001, People`s Republic of China

Yunzhi Gao

MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, Harbin Institute of Technology, Harbin 150001, People`s Republic of China

Geping Yin

MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, Harbin Institute of Technology, Harbin 150001, People`s Republic of China
Abstract

Tris(2, 2, 2-trifluoroethyl) borate (TTFEB) is evaluated as an effective electrolyte additive for LiNi_1/3Co_1/3Mn_1/3O₂ cathode. Galvanostatic charge/discharge tests indicate that the cycling performance and rate capability of LiNi_1/3Co_1/3Mn_1/3O₂ cathode are enhanced dramatically with the presence of 0.5 wt% TTFEB in electrolyte, which delivers a high initial discharge capacity of 185.3 mAh g⁻¹ at 0.5 C with high capacity retention of 89.5% after 100 cycles. Moreover, superior discharge capacity of 135.1 mAh g⁻¹ is displayed at high rate of 4 C, while only 73.7 mAh g⁻¹ is delivered for the cell without TTFEB. The effects of TTFEB on the LiNi_1/3Co_1/3Mn_1/3O₂ cathode surface are further investigated by EIS, SEM, XRD and XPS. It is found that the enhanced electrochemical performance can mainly be attributed to the alleviation of electrolyte decomposition and prevention of LiNi_1/3Co_1/3Mn_1/3O₂ cathode structural deterioration at the high voltage, which is benefited by the formation of the thin and uniform film with lower interfacial impedance on cathode surface with the presence of TTFEB.

Keywords

Electrolyte additive, High-voltage, Interface, LiNi_1/3Co_1/3Mn_1/3O₂ cathode, Lithium ion batteries, Tris(2,2,2-trifluoroethyl) borate

DOI: 10.1149/2.0891709jes

ADLID: 6537-v03

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Keywords
Electrolyte additive High-voltage Interface LiNi_1/3Co_1/3Mn_1/3O₂ cathode Lithium ion batteries Tris(2 2 2-trifluoroethyl) borate

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