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Title: The Impact of Aluminum and Iron Substitution on the Structure and Electrochemistry of Li[Ni0.4Co0.2-yMyMn0.4]O2 Materials

Li[Ni0.4Co0.2-yMyMn0.4]O2 (0<_y<_0.2) (M=Al) and Li[Ni0.4Co0.15Fe0.05Mn0.4]O2 compounds were prepared in order to investigate the effect of replacement of all or part of the cobalt on the structural and electrochemical properties. The impact of substitution on the structure has been examined by both x-ray and neutron diffraction experiments. The incorporation of aluminum has minimal effect on the anti-site defect concentration, but leads to structural changes that affect electrochemical performance. The most important effect is an opening of the lithium slab dimension upon substitution, which results in improved rate performance compared to the parent compound. In contrast, the lithium slab dimension is not affected by iron substitution and no rate enhancement effect is observed. The cycling stability of aluminum containing materials is superior to both the parent material and iron-substituted materials.
Authors:
; ;
Publication Date:
OSTI Identifier:
980742
Report Number(s):
LBNL-2893E
Journal ID: ISSN 0013-4651; JESOAN; TRN: US201015%%2115
DOE Contract Number:
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of the Electrochemical Society; Journal Volume: 156; Journal Issue: 12; Related Information: Journal Publication Date: 2009
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; COBALT; DEFECTS; DIMENSIONS; ELECTROCHEMISTRY; IRON; LITHIUM; MATERIALS; NEUTRON DIFFRACTION; OPENINGS; PERFORMANCE; SLABS; STABILITY Li ion battery, layered transition metal oxides, cathodes