Microvoltammetry for cathode materials at elevated temperatures: electrochemical stability of single particles

被引：68

作者：

Dokko, K ^{[1
]}

Horikoshi, S ^{[1
]}

Itoh, T ^{[1
]}

Nishizawa, M ^{[1
]}

Mohamedi, M ^{[1
]}

Uchida, I ^{[1
]}

机构：

[1] Tohoku Univ, Grad Sch Engn, Dept Appl Chem, Aoba Ku, Sendai, Miyagi 9808579, Japan

来源：

JOURNAL OF POWER SOURCES | 2000年 / 90卷 / 01期

关键词：

microelectrode; single particle; cycle stability; lithium ion battery; lithium manganese oxide; lithium cobalt oxide;

D O I：

10.1016/S0378-7753(00)00456-0

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：

The electrochemical stability of single particles of cathode materials (LiMn2O4, Li1.10Cr0.048Mn1.852O4, LiCoO2 and LiNi0.85Co0.15O2) was investigated by means of a microelectrode technique at 25 degrees C and 50 degrees C. The cycle stability was evaluated by multi-cyclic voltammetry. LiMn2O4 showed good cycle stability in LiClO4/propylene carbonate (PC) + ethylene carbonate (EC) and LiBF4/PC + EC solutions even at 50 degrees C. On the contrary, in LiPF6/PC + EC, significant capacity fading during charge-discharge was observed at 50 degrees C. The cycle stability of LiMn2O4 in the latter solution was improved by partial substitution of Mn by Cr and Li. Regarding LiCoO2, its cycle life in LiClO4/PC + EC at 50 degrees C was unsatisfactory when the potential was scanned between 3.60 and 4.30 V. On the other hand, LiCoO2 retained 90% of its capacity when the potential scan was limited to 4.00 V. LiNi0.85Co0.15O2 showed similar trend at 50 degrees C. (C) 2000 Elsevier Science S.A. All rights reserved.

引用

页码：109 / 115

页数：7

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