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A Truncated Manganese Spinel Cathode for Excellent Power and Lifetime in Lithium-Ion Batteries

Cited 163 time in Web of Science Cited 167 time in Scopus
Authors
Kim, Joo-Seong; Kim, KyungSu; Cho, Woosuk; Shin, Weon Ho; Kanno, Ryoji; Choi, Jang Wook
Issue Date
2012-12
Citation
Nano Letters, Vol.12 No.12, pp.6358-6365
Keywords
Lithium ion batterycathode materialmanganese spineltruncationmanganese dissolutioncycle life
Abstract
Spinel-structured lithium manganese oxide (LiMn2O4) cathodes have been successfully commercialized for various lithium battery applications and are among the strongest candidates for emerging large-scale applications. Despite its various advantages including high power capability, however, LiMn2O4 chronically suffers from limited cycle life, originating from well-known Mn dissolution. An ironical feature with the Mn dissolution is that the surface orientations supporting Li diffusion and thus the power performance are especially vulnerable to the Mn dissolution, making both high power and long lifetime very difficult to achieve simultaneously. In this investigation, we address this contradictory issue of LiMn2O4 by developing a truncated octahedral structure in which most surfaces are aligned to the crystalline orientations with minimal Mn dissolution, while a small portion of the structure is truncated along the orientations to support Li diffusion and thus facilitate high discharge rate capabilities. When compared to control structures with much smaller dimensions, the truncated octahedral structure as large as 500 nm exhibits better performance in both discharge rate performance and cycle life, thus resolving the previously conflicting aspects of LiMn2O4.
ISSN
1530-6984
URI
http://hdl.handle.net/10371/164560
DOI
https://doi.org/10.1021/nl303619s
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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