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首页> 外文会议>Challenges for transportation batteries >Improvement of Cycleability for Li-Si Alloy Anodes Using Si Thin Flakes for Li-ion Batteries
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Improvement of Cycleability for Li-Si Alloy Anodes Using Si Thin Flakes for Li-ion Batteries

机译：使用硅薄片用于锂离子电池的锂硅合金阳极循环性能的改善

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摘要

Pure Si thin flakes (Si Leaf Powder~® (Si-LP)) of different thicknesses (50, 100, 200, 300 and 400 nm) were prepared, and their charge/discharge properties were investigated as anode materials for lithium ion batteries (LIBs). Thickness of the thin Si-LP (100 nm) changed reversibly during charging and discharging, while the expanded thickness upon charging was kept after fully discharged for the thick one (300 nm), indicating insufficient Li de-alloying at C/6 rate. The slower kinetics for the thicker Si-LPs was also confirmed by examination of the open circuit potential (OCP) and the rate capability. These suggested that Li atoms diffused easily within the thinner Si-LPs and the uniform Li distribution suppressed the physical stress due to the Li alloying and de-alloying, resulting a good cycleability. In addition, addition of vinylene carbonate (VC) in electrolyte reduced charge transfer resistance of the Li alloying/de-alloying reaction and much more improved the cycleability of Si-LPs.
机译：制备了不同厚度（50、100、200、300和400 nm）的纯Si薄片（Si LeafPowder®（Si-LP）），并研究了它们的充电/放电性能作为锂离子电池的负极材料（ LIB）。薄Si-LP（100 nm）的厚度在充电和放电过程中可逆地变化，而对于厚厚的Si-LP（300 nm），在完全放电后仍保持充电时扩展的厚度，表明在C / 6速率下锂脱合金不足。通过检查开路电势（OCP）和速率能力也证实了较厚的Si-LP的动力学较慢。这些表明，Li原子易于在较薄的Si-LPs中扩散，并且均匀的Li分布抑制了由于Li合金化和脱合金而产生的物理应力，从而具有良好的循环性。另外，在电解质中添加碳酸亚乙烯酯（VC）降低了Li合金化/脱合金反应的电荷转移阻力，并且大大提高了Si-LP的循环能力。

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  • 会议地点 Boston MA(US)
  • 作者

    Tomoyuki Yamada; Morihiro Saito; Chihiro Yodoya; Akika Kamei; Masato Hirota; Toshio Takenaka; Akimasa Tasaka; Minoru Inaba;

  • 作者单位

    Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan;

    Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan;

    Oike Co., Ltd., Kamitoba, Mimani-ku, Kyoto 601-8121, Japan;

    Oike Co., Ltd., Kamitoba, Mimani-ku, Kyoto 601-8121, Japan;

    Oike Co., Ltd., Kamitoba, Mimani-ku, Kyoto 601-8121, Japan;

    Oike Co., Ltd., Kamitoba, Mimani-ku, Kyoto 601-8121, Japan;

    Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan;

    Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan;

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