Surface studies of high voltage lithium rich composition: Li1.2Mn0.525Ni0.175Co0.1O2

被引：132
作者：
Martha, Surendra K. [1 ]
Nanda, Jagjit [1 ]
Veith, Gabriel M. [1 ]
Dudney, Nancy J. [1 ]
机构：
[1] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA
来源：
JOURNAL OF POWER SOURCES | 2012年 / 216卷
关键词：
Lithium battery; Li-rich MNC; Impedance; Surface chemistry; XPS; Micro-Raman spectroscopy; CATHODE MATERIALS; ION BATTERIES; LI; ELECTROLYTE; PERFORMANCE; INTERCALATION; IMPEDANCE; SPECTROSCOPY; MECHANISMS; PARTICLES;
D O I：
10.1016/j.jpowsour.2012.05.049
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
This article reports the evidence of surface film formation due to the oxidation of electrolyte upon high voltage cycling (4.9 V) of the lithium rich cathode, Li1.2Mn0.525Ni0.175Co0.1O2. We have studied the chemical composition of this surface film using electrochemical impedance, X-ray Photoelectron and micro-Raman spectroscopies and the results are compared against the pristine electrode. In order to distinguish the changes in the surface film composition induced by prolonged electrochemical cycling versus chemical passivation effect, we studied the surface composition of cathode powders aged with electrolytes at 60 degrees C. Our results show that after 150 cycles, the electrodes showed a rapid drop in capacity due to increase in the surface film resistance resulting in limited capacity utilization. (C) 2012 Elsevier B.V. All rights reserved.
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收藏
页码：179 / 186
页数：8
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