Improvement of Structural Stability of LiMn[sub 2]O[sub 4] Cathode Material on 55°C Cycling by Sol-Gel Coating of LiCoO[sub 2]
- 1 January 1999
- journal article
- Published by The Electrochemical Society in Electrochemical and Solid-State Letters
- Vol. 2 (12) , 607-609
- https://doi.org/10.1149/1.1390922
Abstract
A significant improvement in high temperature performance of cathode material has been achieved by sol‐gel coating its particle surface with . Although the coating completely disappeared by reacting with at , a newly formed spinel phase, , having a higher concentration at the particle surface, provided excellent structural stability on cycling at . Although the initial capacity at was reduced to 109 from by the coating, the stability on cycling was noticeably improved. The coated retains approximately 91% of its initial capacity after 100 cycles at rate at while the uncoated suffered nearly 50% loss of the initial capacity in the same condition. These results indicate that higher concentration of ions at the surface is effective in protecting the active material from dissolution into electrolytes, resulting in the performance improvement. ©1999 The Electrochemical SocietyKeywords
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