材料科学
锂(药物)
阳极
锂离子电池
化学工程
电池(电)
纳米复合材料
复合材料
储能
球磨机
复合数
冶金
微观结构
作者
Chadrasekhar Loka,HoTak Yu,Kee-Sun Lee,JongSoo Cho
标识
DOI:10.1016/j.jpowsour.2013.01.107
摘要
Abstract Nanocrystalline Silicon (Si) embedded Ni–Ti composite anode materials are synthesized by using two-stage high-energy mechanical milling (HEMM). The overall composition of the Si and NiTi (Nitinol) powders are 65 at.% and 35 at.%. The effects of crystal size, crystal structure, and microstructure on the electrochemical properties of the nanocomposite powders are examined through X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, electrochemical test and nano-indentation test. The capacities of the coin cells produced with the 6 and 10 h milled powders are 711 and 553 mAh g−1, respectively, after the 52nd cycle. The efficiencies of the coin cells produced with the 6 and 10 h milled powders continue to maintain 97.2 and 97.5%, respectively, until 52nd cycle. Coin cells produced with 10 h milled powders show relatively low capacity fading, which are attributed to the nanocomposite structure comprised of Si nanocrystals embedded into amorphous Ni–Ti matrix phase. Coin cell of 10 h milled powders reveals the reduced number of voids. Therefore, it is believed that Si embedded Ni–Ti nanocomposite using a two-stage high energy mechanical milling can be a promising candidate for high performance Si based anode materials.
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