リチウム電池負極材料としてのシリコン基合金薄膜のナノファイバー組織と組成変調構造

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  • Nano-Fibers and Concentration Modulation in Films of Si and Si-Based Nano-Composite Alloys As Negative Electrode Materials for Li Secondary Battery
  • リチウム デンチ フキョク ザイリョウ ト シテノ シリコンキ ゴウキン ハクマク ノ ナノファイバー ソシキ ト ソセイ ヘンチョウ コウゾウ

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  As negative electrode materials with high capacity and long cycle lives for advanced Li-ion batteries, Si-based alloy films have been prepared on Cu-foil substrate by use of electron beam deposition method or magnetron-sputtering method at room temperature. In this study, nano-structures of the Si-based alloy films have been investigated by conventional and analytical transmission electron microscopy.<br>    Experimental results are summarized as follows: (1) Si-based alloy films consist of a number of nano-fibers of 5 nm in diameter. Electron diffraction patterns from the films show halo. Crystallites are seldom found in high resolution images. (2) One-dimensional modulations of the constituents are formed in the range of 3.6 to 11 nm in the films. These nano-structures of the Si-based alloy films could relax the volume expansion of the Si during Li-insertion, causing the longer cycle lives than that of the Si film as the negative electrodes.<br>

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 71 (8), 646-653, 2007

    公益社団法人 日本金属学会

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