期刊
ELECTROCHIMICA ACTA
卷 56, 期 21, 页码 7327-7333出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2011.06.042
关键词
Orthosilicate; Air exposure; Regeneration; Lithium ion battery
资金
- Foundation for University Key Teacher by the Heilongjiang Ministry of Education [1155G28]
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.
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