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Electrode Characteristics of Sputtered Lithium Manganese Oxide Films with Diamond-Like-Carbon Top Layer

Published online by Cambridge University Press:  21 March 2011

Hee-Soo Moon ,
Kwang-Sun Ji ,
Won-Il Cho ,
Young-Soo Yun  and
Jong-Wan Park
Hee-Soo Moon
Affiliation:
Division of Materials Science and Engineering, Hanyang University, 17 Haengdang-Dong, Seongdong-Ku, Seoul 133-791, Korea
Kwang-Sun Ji
Affiliation:
Division of Materials Science and Engineering, Hanyang University, 17 Haengdang-Dong, Seongdong-Ku, Seoul 133-791, Korea
Won-Il Cho
Affiliation:
Korea Institute of Science and Technology 39-1, Hawolkok-Dong, Sungbuk-Ku, Seoul 136-791, Korea
Young-Soo Yun
Affiliation:
Korea Institute of Science and Technology 39-1, Hawolkok-Dong, Sungbuk-Ku, Seoul 136-791, Korea
Jong-Wan Park
Affiliation:
Division of Materials Science and Engineering, Hanyang University, 17 Haengdang-Dong, Seongdong-Ku, Seoul 133-791, Korea
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Abstract

There have been increasing interests in lithium rechargeable batteries, especially microbatteries, with rapid development of portable electronic equipments and MEMS(Micro electromechanical systems) technology. In this work, lithium manganese oxide, as a strong candidate for the battery materials, which is more abundant, stable in ambient state and less toxic than the other oxides such as lithium nickel oxides and lithium cobalt oxides, was deposited by rf magnetron sputter. The effect of thermal treatment on the microstructure and electrode characteristics of lithium manganese oxide cathode was investigated. In electrochemical experiment using liquid electrolyte, half-cell failure would be caused by manganese dissolution, degradation of electrolyte materials during charging/discharging process and so on. In this research we focus on interface reaction problem that would affect the cyclability and lifetime of microbattery. In order to reduce the interface reaction during operation, we introduce DLC(Diamond-like-Carbon) film that has high electrical resistivity, mechanical hardness and chemical stability. DLC film was deposited on sputtered lithium manganese oxide electrode by ECRCVD(Electron Cyclotron Resonance Chemical Vapor Deposition). DLC-top-layer LiMn2O4 film was more stable during charging/discharging reaction and higher discharge capacity in wide voltage windows than LiMn2O4 film.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 672: Symposium O – Mechanisms of Surface and Microstructure Evolution in Deposited Films and Film Structures , 2001 , O8.32
Copyright
Copyright © Materials Research Society 2001

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References

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