Thermal analysis of LixCoO2 cathode material of lithium ion battery

被引：52

作者：

Veluchamy, Angathevar ^{[1
,2
]}

Doh, Chil-Hoon ^{[1
]}

Kim, Dong-Hun ^{[1
]}

Lee, Jung-Hun ^{[1
,3
]}

Shin, Hye-Min ^{[1
]}

Jin, Bong-Soo ^{[1
]}

Kim, Hyun-Soo ^{[1
]}

Moon, Seong-In ^{[1
]}

机构：

[1] Korea Electrotechnol Res Inst, Chang Won 641600, South Korea

[2] Cent Electrochem Res Inst, Karaikkudi 630006, Tamil Nadu, India

[3] Kyungnam Univ, Masan 631701, South Korea

来源：

JOURNAL OF POWER SOURCES | 2009年 / 189卷 / 01期

关键词：

Cathode; LixCoO2; Thermal analysis; Thermal stability; Solid electrolyte interface film; SURFACE-FILM FORMATION; ELECTRODES; BEHAVIOR; LICOO2; CELL; XPS;

D O I：

10.1016/j.jpowsour.2008.07.090

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：

Thermal behavior of LixCoO2 cathode material from cells charged to different voltages has been analyzed using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The mass loss appearing between 60 and 125 degrees C in TGA and the exothermic peaks with 4.9 and 7.0 J g(-1) in DSC around 75 and 85 degrees C for the LixCoO2 cathodes of 4.20 and 4.35 V cells has been explained based on solid electrolyte interface (SEI) film-break down. The SEI film-break down for the highly charged cathode at low temperature region has been attributed to the conversion of lithium fluoride into hydrofluoric acid in concomitant with the reaction, Li2CO3 + 2HF -> 2LiF + CO2 + H2O. Presence of ionic carbonate in the positive electrode has been identified by ion chromatography (IC). The thermal peaks appearing in different temperature regions have been explained based on decomposition reaction of LixCoO2 cathodes and the SEI film. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：855 / 858

页数：4

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