Nano-composite Si particle formation by plasma spraying for negative electrode of Li ion batteries

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  • M. Kambara
    Department of Materials Engineering, The University of Tokyo 1 , 7-3-1, Hongo, Bunkyo, Tokyo 113-8656, Japan
  • A. Kitayama
    Department of Materials Engineering, The University of Tokyo 1 , 7-3-1, Hongo, Bunkyo, Tokyo 113-8656, Japan
  • K. Homma
    Department of Materials Engineering, The University of Tokyo 1 , 7-3-1, Hongo, Bunkyo, Tokyo 113-8656, Japan
  • T. Hideshima
    Department of Materials Engineering, The University of Tokyo 1 , 7-3-1, Hongo, Bunkyo, Tokyo 113-8656, Japan
  • M. Kaga
    Department of Materials Engineering, The University of Tokyo 1 , 7-3-1, Hongo, Bunkyo, Tokyo 113-8656, Japan
  • K.-Y. Sheem
    Samsung SDI 2 , 428-5, Gongse-dong, Giheung, Yongin, Gyeonggi 446-577, South Korea
  • S. Ishida
    Samsung SDI 2 , 428-5, Gongse-dong, Giheung, Yongin, Gyeonggi 446-577, South Korea
  • T. Yoshida
    Department of Materials Engineering, The University of Tokyo 1 , 7-3-1, Hongo, Bunkyo, Tokyo 113-8656, Japan

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<jats:p>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.</jats:p>

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