Improvement of structural stability of LiMn2O4 cathode material on 55 degrees C cycling by sol-gel coating of LiCoO2
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- Title
- Improvement of structural stability of LiMn2O4 cathode material on 55 degrees C cycling by sol-gel coating of LiCoO2
- Author
- Cho, Jaephil; Kim, GB; Lim, HS; Kim, CS; Yoo, SI
- Keywords
- TEMPERATURE PERFORMANCE; CAPACITY; LITHIUM; CELLS
- Issue Date
- 1999-12
- Publisher
- ELECTROCHEMICAL SOC INC
- Citation
- ELECTROCHEMICAL AND SOLID STATE LETTERS, v.2, no.12, pp.607 - 609
- Abstract
- A significant improvement in high temperature performance of LiMn2O4 cathode material has been achieved by sol-gel coating its particle surface with LiCoO2. Although the LiCoO2 coating completely disappeared by reacting with LiMn2O4 at 800 degrees C, a newly formed spinel phase, Li1+xMn2-xCoxO4, having a higher Co concentration at the particle surface, provided excellent structural stability on cycling at 55 degrees C. Although the initial capacity at 55 degrees C was reduced to 109 from 113 mAh/g by the coating, the stability on cycling was noticeably improved. The coated LiMn2O4 retains approximately 91% of its initial capacity after 100 cycles at 0.2 C rate at 55 degrees C while the uncoated LiMn2O4 suffered nearly 50% loss of the initial capacity in the same condition. These results indicate that higher concentration of Co ions at the surface is effective in protecting the active material from Mn3+ dissolution into electrolytes, resulting in the performance improvement.
- URI
- ; Go to Link
- DOI
- 10.1149/1.1390922
- ISSN
- 1099-0062
- Appears in Collections:
- ECHE_Journal Papers
- Files in This Item:
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