Regeneration and characterization of air-exposed Li2FeSiO4

被引：55

作者：

Deng, C. ^{[1
]}

Zhang, S. ^{[2
]}

Gao, Y. ^{[1
]}

Wu, B. ^{[1
]}

Ma, L. ^{[1
]}

Sun, Y. H. ^{[1
]}

Fu, B. L. ^{[2
]}

Wu, Q. ^{[2
]}

Liu, F. L. ^{[2
]}

机构：

[1] Harbin Normal Univ, Coll Chem & Chem Engn, Coll Heilongjiang Prov, Key Lab Design & Synth Funct Mat & Green Catalysi, Harbin 150025, Heilongjiang, Peoples R China

[2] Harbin Engn Univ, Coll Mat Sci & Chem Engn, Harbin 150001, Heilongjiang, Peoples R China

来源：

ELECTROCHIMICA ACTA | 2011年 / 56卷 / 21期

关键词：

Orthosilicate; Air exposure; Regeneration; Lithium ion battery; CATHODE MATERIALS; ELECTROCHEMICAL PERFORMANCE; ELECTRODE MATERIALS; SURFACE; LI2MNSIO4; BATTERIES;

D O I：

10.1016/j.electacta.2011.06.042

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The air-exposed Li2FeSiO4 was characterized and regenerated by calcination under argon. The original Li2FeSiO4 was prepared by a sol-gel method and was then exposed in air for a year. The impact of long-term air exposure on the structure, surface and electrochemical characteristics of Li2FeSiO4 was investigated. In comparison with the original sample, the air-exposed sample was seriously oxidized. The oxidation speed decreases with increasing air-exposure time. The oxidization of Li2FeSiO4 led to surface change and deteriorated electrochemical performance. However, the changes induced by air exposure were entirely reversible. The one year air-exposed Li2FeSiO4 was regenerated by calcination under Argon. The regeneration conditions including calcination temperature and calcination time were optimized. The sample regenerated by calcining at 700 degrees C for 4 h had similar structure, surface and electrochemical characteristics to the original sample. Based on detailed analysis, the possible regeneration mechanisms were proposed. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：7327 / 7333

页数：7

共 17 条

[1] Synthesis and characterization of Li2Fe0.97M0.03SiO4 (M = Zn2+, Cu2+, Ni2+) cathode materials for lithium ion batteries [J].