Improved Electrochemical Performance of NH4AlF4-Coated LiCoO2 Cycled over 4.5 V

被引：11

作者：

Amine, Rachid ^{[1
]}

Sun, Ho Hyun ^{[2
]}

Sun, Ho Jin ^{[2
]}

Prakash, Jai ^{[1
]}

机构：

[1] IIT, Dept Chem & Biol Engn, Ctr Electrochem Sci & Engn, Chicago, IL 60616 USA

[2] Glenbrook N High Sch, Northbrook, IL 60062 USA

来源：

ELECTROCHEMICAL AND SOLID STATE LETTERS | 2010年 / 13卷 / 08期

关键词：

aluminium compounds; ammonium compounds; cathodes; coatings; electrochemical electrodes; electrochemical impedance spectroscopy; lithium compounds; secondary cells; METAL-OXIDES; BEHAVIOR; VOLTAGE; INTERCALATION; BATTERIES; LIXCOO2; CATHODE;

D O I：

10.1149/1.3430642

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Cathode coatings are being developed to improve lithium-ion batteries. In this effort, LiCoO2 particles were coated with NH4AlF4 by a simple dry-coating process to enhance capacity retention on a 4.5 V cutoff cycling. Compared with pristine LiCoO2, this coating greatly improved the electrode cyclability and rate capability. Electrochemical impedance spectroscopy and a cobalt dissolution test showed that the NH4AlF4 coating protected the LiCoO2 particle surface from HF and, thus, suppressed the increase in interfacial impedance between the cathode and electrolyte that occurred with an uncoated cathode material. (C) 2010 The Electrochemical Society. [DOI: 10.1149/1.3430642] All rights reserved.

引用

页码：A101 / A104

页数：4

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