Correlation of oxygen non-stoichiometry to the instabilities and electrochemical performance of LiNi0.8Co0.1Mn0.1O2 utilized in lithium ion battery

被引：147

作者：

Bi, Yujing ^{[1
]}

Yang, Wenchao ^{[1
]}

Du, Rui ^{[1
]}

Zhou, Jingjing ^{[1
]}

Liu, Meng ^{[1
]}

Liu, Yang ^{[1
]}

Wang, Deyu ^{[1
]}

机构：

[1] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Zhejiang, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2015年 / 283卷

关键词：

Oxygen non-stoichiometry; Ni/Li disorder; Surface sensitivity; High nickel cathode; Lithium ion battery; CATHODE MATERIAL; POSITIVE ELECTRODE; DEFECT CHEMISTRY; MN; NI; CO;

D O I：

10.1016/j.jpowsour.2015.02.095

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：

In this work, we investigate the influence of oxygen non-stoichiometry on the characteristics of LiNi0.8Co0.1Mn0.1O2 cathode material. Among the investigated samples, the level of Ni/Li disorder in the bulk and the thickness of auto-generated layer on the surface share the same trend as the amount of oxygen loss in LiNi0.8Co0.1Mn0.1O2 materials. It indicates that the aforementioned key structural instabilities should be tightly related to the oxygen defects and the induced structural relaxation. As a consequence of structural entirety, the sample with the least defects presents the highest discharge capacity (192.9 mAhg(-1) at 0.1C), the best rate capability (160.1 mAhg(-1) at SC), and the most stable cyclibility (89.9% at 200th). Our results demonstrate that oxygen deficiency plays a key role to determine the electrochemical performance of high-nickel cathode materials. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：211 / 218

页数：8

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