Surface Chemistry Study of LiCoO2 Coated with Alumina Научная публикация
Конференция |
16th International Conference on Solid State Ionics 01-06 июл. 2007 , Shanghai |
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Журнал |
Solid State Ionics
ISSN: 0167-2738 |
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Вых. Данные | Год: 2008, Том: 179, Номер: 27-32, Страницы: 1745-1749 Страниц : 5 DOI: 10.1016/j.ssi.2008.02.013 | ||||||
Ключевые слова | Al2O3 coating, Cycling, LiCoO2, NMR, XPS | ||||||
Авторы |
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Организации |
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Информация о финансировании (1)
1 | Российский фонд фундаментальных исследований | 05-03-32703 |
Реферат:
The surface chemistry of the Al2O3-coated LiCoO2 prepared under heat treatment at 80–800 °C was studied by SEM, XRD, IR, XPS and NMR spectroscopy combined with electrochemical testing. It is shown that the particle bulk is free from dopant. XPS Al2s core-level spectrum of the coated LiCoO2 differs from that of α-Al2O3 and is associated with Al oxyhydroxide. 27Al NMR spectra of the samples prepared at 80–600 °C consist of intensive asymmetric peak with maximum at 4.8–6.2 ppm (Al in an octahedral coordination free from Co in the second coordination
sphere) and two less intensive ones at ~55–56 and ~61–62 ppm. On the other hand, the spectrum of the 800 °C sample has no peak near 0 ppm, but has a series of peaks in the range of 26–62 ppm with an interval of about 7 ppm, characteristic of Al octahedral environment with neighboring Al number ranging from 6 to 0. This indicates that the shell consists mostly of amorphous oxyhydroxide in the first case and of LiCo1 − yAlyO2 solid solution in the second. Electrochemical testing shows a significant increase in discharge capacity (N150 mAh/g) and improved cyclability of
the coated samples heated below 600 °C, while after heat treatment at 800 °C, the capacity of composite cathode fades quickly.
Библиографическая ссылка:
Kosova N.
, Devyatkina E.
, Slobodyuk A.
, Kaichev V.
Surface Chemistry Study of LiCoO2 Coated with Alumina
Solid State Ionics. 2008. V.179. N27-32. P.1745-1749. DOI: 10.1016/j.ssi.2008.02.013 WOS Scopus РИНЦ
Surface Chemistry Study of LiCoO2 Coated with Alumina
Solid State Ionics. 2008. V.179. N27-32. P.1745-1749. DOI: 10.1016/j.ssi.2008.02.013 WOS Scopus РИНЦ
Даты:
Поступила в редакцию: | 21 июл. 2007 г. |
Принята к публикации: | 9 февр. 2008 г. |
Опубликована online: | 2 апр. 2008 г. |
Опубликована в печати: | 30 сент. 2008 г. |
Идентификаторы БД:
Web of science | WOS:000259276200103 |
Scopus | 2-s2.0-48349111720 |
РИНЦ | 13579360 |
Chemical Abstracts | 2008:967989 |
Chemical Abstracts (print) | 151:202009 |
OpenAlex | W1994310327 |