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Electrochemical Properties of SnO2 Thin Films Doped with Bi and Si for Negative Electrode of Microbattery

Published online by Cambridge University Press:  21 March 2011

Young-Il Kim ,
Hee-Soo Moon ,
Kwang-Sun Ji ,
You-Kee Lee  and
Jong-Wan Park
Young-Il Kim
Affiliation:
Division of Materials Science and Engineering, Hanyang University, 17 Haengdang-Dong, Seongdong-Ku, Seoul 133-791, Korea
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
You-Kee Lee
Affiliation:
Division of Materials Science and Engineering, Hanyang University, 17 Haengdang-Dong, Seongdong-Ku, Seoul 133-791, Korea
Jong-Wan Park
Affiliation:
Department of Semiconductor Engineering, Uiduk University, San 50, Yookum-Ri, Kangdong-Myun, Kyoungju 780-713, Korea
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Abstract

Tin oxide has been proposed as a promising alternative anode material for microbatteries. It has been reported that its theoretical volumetric capacity is four times larger than that of carbon-based materials, while its gravimetric capacity is twice as large. In this experiment, optimal Si and Bi doped SnO2 films were prepared with e-beam evaporation to improve both the cycle performance and the reversible capacity. The films with addition of Si only exhibited reductions in aggregation of tin particles and formation of micro-cracks. However, there still remained cracks, which induce capacity loss during cycling. To improve capacity retention, Bi was added with Si to SnO2 films, which exhibited the highest reversible capacity of 200µAh/cm2-µm at 200th cycle. The films doped with Bi and Si were found to be ill-defined and featureless without noticeable particle aggregation and cracks. However, the films that underwent cycling tests showed again aggregated tin particles and formation of cracks, which would induce cell failure during cycling. We believe that some types of Li-Bi phases as mixed-conductor matrices have improved the cycle life.

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 , O8.26
Copyright
Copyright © Materials Research Society 2001

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