Nano-composite silicon powders have been produced at a maximum process throughput of 6 g/min by plasma spraying with metallurgical grade silicon powder as raw material. The obtained powders are found to be fundamentally composed of crystalline silicon particles of 20–40 nm in diameter, and are coated with an ∼5-nm-thick amorphous carbonous layer when methane gas is additionally introduced during plasma spraying. The performance of half-cell batteries containing the powders as negative electrodes has shown that the capacity decay observed for the raw Si coarse particles is significantly improved by plasma treatment. The carbonous coating potentially contributes to an improvement in capacity retention, although coexisting SiC particles that inevitably form during high-temperature processing reduce the overall capacity.
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14 April 2014
Research Article|
April 09 2014
Nano-composite Si particle formation by plasma spraying for negative electrode of Li ion batteries
M. Kambara;
M. Kambara
1
Department of Materials Engineering, The University of Tokyo
, 7-3-1, Hongo, Bunkyo, Tokyo 113-8656, Japan
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A. Kitayama;
A. Kitayama
1
Department of Materials Engineering, The University of Tokyo
, 7-3-1, Hongo, Bunkyo, Tokyo 113-8656, Japan
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K. Homma;
K. Homma
1
Department of Materials Engineering, The University of Tokyo
, 7-3-1, Hongo, Bunkyo, Tokyo 113-8656, Japan
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T. Hideshima;
T. Hideshima
1
Department of Materials Engineering, The University of Tokyo
, 7-3-1, Hongo, Bunkyo, Tokyo 113-8656, Japan
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M. Kaga;
M. Kaga
1
Department of Materials Engineering, The University of Tokyo
, 7-3-1, Hongo, Bunkyo, Tokyo 113-8656, Japan
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K.-Y. Sheem;
K.-Y. Sheem
2
Samsung SDI
, 428-5, Gongse-dong, Giheung, Yongin, Gyeonggi 446-577, South Korea
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S. Ishida;
S. Ishida
2
Samsung SDI
, 428-5, Gongse-dong, Giheung, Yongin, Gyeonggi 446-577, South Korea
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T. Yoshida
T. Yoshida
1
Department of Materials Engineering, The University of Tokyo
, 7-3-1, Hongo, Bunkyo, Tokyo 113-8656, Japan
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J. Appl. Phys. 115, 143302 (2014)
Article history
Received:
February 22 2014
Accepted:
March 26 2014
Citation
M. Kambara, A. Kitayama, K. Homma, T. Hideshima, M. Kaga, K.-Y. Sheem, S. Ishida, T. Yoshida; Nano-composite Si particle formation by plasma spraying for negative electrode of Li ion batteries. J. Appl. Phys. 14 April 2014; 115 (14): 143302. https://doi.org/10.1063/1.4870600
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