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Enhanced Stability of LiCoO2 Cathodes in Lithium-Ion Batteries Using Surface Modification by Atomic Layer Deposition.

Enhanced Stability of LiCoO2 Cathodes in Lithium-Ion Batteries Using Surface Modification by Atomic Layer Deposition.

Authors :
Jung, Yoon Seok
Cavanagh, Andrew S.
Dillon, Anne C.
Groner, Markus D.
George, Steven M.
Lee, Se-Hee
Source :
Journal of The Electrochemical Society; 2010, Vol. 157 Issue 1, pA75-A81, 7p
Publication Year :
2010

Abstract

Ultrathin atomic layer deposition (ALD) coatings enhance the performance of lithium-ion batteries (LIBs). Previous studies have demonstrated that LiCoO<subscript>2</subscript> cathode powders coated with metal oxides with thicknesses of ∼100 to 1000 Å grown using wet chemical techniques improved LIB performance. In this study, LiCoO<subscript>2</subscript> powders were coated with conformal Al<subscript>2</subscript>O<subscript>3</subscript> ALD films with thicknesses of only ∼ 3 to 4 A established using two ALD cycles. The coated LiCoO<subscript>2</subscript> powders exhibited a capacity retention of 89% after 120 charge-discharge cycles in the 3.3-4.5 V (vs Li/LiF) range. In contrast, the bare LiCoO<subscript>2</subscript> powders displayed only a 45% capacity retention. Al<subscript>2</subscript>O<subscript>3</subscript> ALD films coated directly on the composite electrode also produced improved capacity retention. This dramatic improvement may result from the ultrathin A12O<subscript>3</subscript> ALD film acting to minimize Co dissolution or reduce surface electrolyte reactions. Similar experiments with ultrathin ZnO ALD films did not display enhanced performance. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00134651
Volume :
157
Issue :
1
Database :
Supplemental Index
Journal :
Journal of The Electrochemical Society
Publication Type :
Academic Journal
Accession number :
48211407
Full Text :
https://doi.org/10.1149/1.3258274