Spinel-structured surface layers for facile Li ion transport andimproved chemical stability of lithium manganese oxide spinel

Title
Spinel-structured surface layers for facile Li ion transport andimproved chemical stability of lithium manganese oxide spinel
Authors
조병원오시형이보은서효리이해리이관영
Keywords
spinel; lithium manganese oxide; manganese dissolution; surface layer; Jahn-Teller distortion
Issue Date
2017-01
Publisher
Applied surface science
Citation
VOL 392-455
Abstract
Li-ion conducting spinel-structured oxide layer with a manganese oxidation state close to being tetravalent was prepared on aluminum-doped lithium manganese oxide spinel for improving the electrochemical performances at the elevated temperatures. This nanoscale surface layer provides a good ionic conduction path for lithium ion transport to the core and also serves as an excellent chemical barrier for protecting the high-capacity core material from manganese dissolution into the electrolyte. In this work, a simple wet process was employed to prepare thin LiAlMnO4 and LiMg0.5Mn1.5O4 layers on the surface of LiAl0.1Mn1.9O4. X-ray absorption studies revealed an oxidation state close to tetravalent manganese on the surface layer of coated materials. Materials with these surface coating layers exhibited excellent capacity retentions superior to the bare material, without undermining the lithium ion transport characteristics and the high rate performances.
URI
http://pubs.kist.re.kr/handle/201004/64863
ISSN
0169-4332
Appears in Collections:
KIST Publication > Article
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