Electrochemical studies on LiCoO2 surface coated with Y3Al5O12 for lithium-ion cells

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Title:	Electrochemical studies on LiCoO2 surface coated with Y3Al5O12 for lithium-ion cells
Authors:	Chen,JM;Cho,YD;Hsiao,CL;Fey,GTK
Contributors:	化學工程與材料工程學系
Keywords:	SOL-GEL PRECURSOR;GARNET YAG FIBERS;THERMAL-STABILITY;CATHODE MATERIALS;CARBOXYLATE-ALUMOXANES;INTERCALATION CATHODE;ENHANCED CYCLABILITY;4.5 V;BATTERIES;OXIDES
Date:	2009
Issue Date:	2010-06-29 17:26:53 (UTC+8)
Publisher:	中央大學
Abstract:	Synthesized yttrium aluminum garnet (YAG) sol was coated on the surface of the LiCoO2 cathode particles by an in situ sol-gel process, followed by calcination at 923 K for 10 h in air. Based on XRD, TEM, and ESCA data, a compact YAG kernel with an average thickness of similar to 20nm was formed on the surface of the core LiCoO2 particles, which ranged from similar to 90 to 120 nm in size. The charge-discharge cycling studies for the coated materials suggest that 0.3 wt.% YAG-coated LiCoO2 heated at 923 K for 10 h in air. delivered a discharge capacity of 167 mAh g(-1) and a cycle stability of about 164 cycles with a fading rate of 0.2 mAh cycle(-1) at a 0.2C-rate between 2.75 and 4.40V vs. Li/Li+. The differential capacity plots revealed that impedance growth was slower for YAG surface treated LiCoO2, when cells were charged at 4.40V. DSC results exemplified that the exothermic peak at similar to 468 K corresponded to the release of much less oxygen and greater thermal-stability. (C) 2008 Elsevier B.V. All rights reserved.
Relation:	JOURNAL OF POWER SOURCES
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] journal & Dissertation

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