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Phase Transition of LiMn2O4 Spinel and its Application for Lithium Ion Secondary Battery

Published online by Cambridge University Press:  10 February 2011

Junji Tabuchi ,
Tatsuji Numata ,
Yuichi Shimakawa  and
Masato Shirakata
Junji Tabuchi
Affiliation:
Material Development Center, NEC Corporation, Kawasaki, Japan
Tatsuji Numata
Affiliation:
Material Development Center, NEC Corporation, Kawasaki, Japan
Yuichi Shimakawa
Affiliation:
Fundamental Research Laboratories, NEC Corporation, Tsukuba, Japan
Masato Shirakata
Affiliation:
Nippon Moli Energy Corporation, Toyama, Japan
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Abstract

LiMn2O4 has a phase transition at room temperature, which is caused by Jahn-Teller distortion. DC resistivity of LiMn2O4 shows an anomaly at the transition temperature, while no such anomaly is observed in samples with excess lithium. X-ray diffraction patterns of LiMn2O4reveal that the crystal structure changes from cubic at higher temperature to orthorombic, as a first approximation, at lower temperature. However, no differences in initial charge-discharge curve are observed, which means that the Jahn-Teller distortion has no effect on electrochemical characteristics. The authors have succeeded in mass-producing lithium ion secondary batteries with a manganese spinel cathode.

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References

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