Vinyl ethylene carbonate as an electrolyte additive for high-voltage LiNi0.4Mn0.4Co0.2O2/graphite Li-ion batteries
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- 作者：Xiaoxi Zuo ; Junhua Wu ; Minkai Zhao ; Chengyun Wang ; Jiansheng Liu ; Junmin Nan
- 关键词：Vinyl ethylene carbonate ; Electrolyte additive ; High voltage ; LiNi0.4Mn0.4Co0.2O2/graphite cells
- 刊名：Ionics
- 出版年：2016
- 出版时间：February 2016
- 年：2016
- 卷：22
- 期：2
- 页码：201-208
- 全文大小：1,987 KB
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Junhua Wu (1)
Minkai Zhao (1)
Chengyun Wang (1)
Jiansheng Liu (2)
Junmin Nan (1)
1. Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, MOE Key Laboratory of Theoretical Chemistry of Environment, School of Chemistry and Environment, South China Normal University, Guangzhou, 510006, Guangdong, China
2. Xinxiang Battery Research Institute, Xinxiang, 453000, Henan, China - 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Electrochemistry
Materials Science
Physical Chemistry
Condensed Matter
Renewable Energy Sources
Electrical Power Generation and Transmission - 出版者：Springer Berlin / Heidelberg
- ISSN：1862-0760
文摘
Vinyl ethylene carbonate (VEC) is investigated as an electrolyte additive to improve the electrochemical performance of LiNi0.4Mn0.4Co0.2O2/graphite lithium-ion battery at higher voltage operation (3.0–4.5 V) than the conventional voltage (3.0–4.25 V). In the voltage range of 3.0–4.5 V, it is shown that the performances of the cells with VEC-containing electrolyte are greatly improved than the cells without additive. With 2.0 wt.% VEC addition in the electrolyte, the capacity retention of the cell is increased from 62.5 to 74.5 % after 300 cycles. The effects of VEC on the cell performance are investigated by cyclic voltammetry(CV), electrochemical impedance spectroscopy(EIS), x-ray powder diffraction (XRD), energy dispersive x-ray spectrometry (EDS), scanning electron microscopy (SEM), and attenuated total reflectance-Fourier transform infrared (ATR-FTIR). The results show that the films electrochemically formed on both anode and cathode, derived from the in situ decomposition of VEC at the initial charge–discharge cycles, are the main reasons for the improved cell performance. Keywords Vinyl ethylene carbonate Electrolyte additive High voltage LiNi0.4Mn0.4Co0.2O2/graphite cells