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Title: Characterization and Electrochemical Performance of SubstitutedLiNi0.4Co0.2-yAlyMn0.4O2 (0<_y<_0.2) Cathode Materials

A complete series of LiNi0.4Co0.2-yAlyMn0.4O2 (0<_y<_0.2) materials have been synthesized and investigated as cathode materials for lithium ion batteries. When cycled between 2.0 and 4.3 V vs. Li/Li+ at a current density of 0.1 mA/cm2, stable capacities of ~;;160 mAh/g for y=0 to ~;;110 mAh/g for y=0.2 are achieved. Upon increasing the current density, it is found that all materials containing aluminum show reduced polarization and improved rate performance. The optimal performance at all current densities was found for the compound with y=0.05. The effect of aluminumsubstitution on the crystal structure of the host is discussed.
Authors:
;
Publication Date:
OSTI Identifier:
941707
Report Number(s):
LBNL-1178E
TRN: US200825%%673
DOE Contract Number:
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: Electrochemical Society Transactions; Journal Volume: 11; Journal Issue: 29; Related Information: Journal Publication Date: 2008
Research Org:
Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
Sponsoring Org:
Materials Sciences Division
Country of Publication:
United States
Language:
English
Subject:
25; ALUMINIUM; CATHODES; CRYSTAL STRUCTURE; CURRENT DENSITY; LITHIUM IONS; PERFORMANCE; POLARIZATION Li ion battery, Al substitution, layered cathode material