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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.
- 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]
- Subjects :
- SURFACE coatings
LITHIUM-ion batteries
LITHIUM
COBALT
OXYGEN
CATHODES
THIN films
Subjects
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