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Titolo:
Improvement of structural stability of LiMn2O4 cathode material on 55 degrees C cycling by sol-gel coating of LiCoO2
Autore:
Cho, J; Kim, GB; Lim, HS; Kim, CS; Yoo, SI;
Indirizzi:
Samsung Display Devices Co, Chonan City, Cungchongnam Do, South Korea Samsung Display Devices Co Chonan City Cungchongnam Do South Korea Korea Seoul Natl Univ, Sch Mat Sci & Engn, Seoul, South Korea Seoul Natl Univ Seoul South Korea ch Mat Sci & Engn, Seoul, South Korea
Titolo Testata:
ELECTROCHEMICAL AND SOLID STATE LETTERS
fascicolo: 12, volume: 2, anno: 1999,
pagine: 607 - 609
SICI:
1099-0062(199912)2:12<607:IOSSOL>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
TEMPERATURE PERFORMANCE; CAPACITY; LITHIUM; CELLS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Cho, J Samsung Display Devices Co, Chonan City, Cungchongnam Do, South Korea Samsung Display Devices Co Chonan City Cungchongnam Do South Korea
Citazione:
J. Cho et al., "Improvement of structural stability of LiMn2O4 cathode material on 55 degrees C cycling by sol-gel coating of LiCoO2", EL SOLID ST, 2(12), 1999, 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 withLiMn2O4 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 55degrees 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. (C) 1999 The Electrochemical Society. S1099-0062(99)07-084-4. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/07/20 alle ore 12:15:47