公开(公告)号：US20140302396A1

公开(公告)日：2014-10-09

申请号：US14357244

申请日：2012-11-09

申请人： GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS

发明人： Shigang Lu ,  Juanyu Yang ,  Xingming Wang ,  Haiyang Ding ,  Zhefeng Gao

IPC分类号： H01M4/36 ,  H01M4/583 ,  H01M10/0525 ,  H01M4/133 ,  H01M4/134 ,  C25B1/00 ,  H01M4/38

CPC分类号： H01M4/364 ,  B82Y30/00 ,  C01B32/956 ,  C25B1/006 ,  H01M4/0438 ,  H01M4/1393 ,  H01M4/1395 ,  H01M4/386 ,  H01M4/483 ,  H01M4/58 ,  H01M4/587 ,  H01M10/052

摘要： The invention relates to a nano silicon-carbon composite negative material for lithium ion batteries and a preparation method thereof. A porous electrode composed of silica and carbon is taken as a raw material, and a nano silicon-carbon composite material of carbon-loaded nano silicon is formed by a molten salt electrolysis method in a manner of silica in-situ electrochemical reduction. Silicon and carbon of the material are connected by nano silicon carbide, and are metallurgical-grade combination, so that the electrochemical cycle stability of the nano silicon-carbon composite material is improved. The preparation method of the nano silicon-carbon composite material provided by the invention comprises the following steps: compounding a porous block composed of carbon and silica powder with a conductive cathode collector as a cathode; using graphite or an inert anode as an anode, and putting the cathode and anode into CaCl2 electrolyte or mixed salt melt electrolyte containing CaCl2 to form an electrolytic cell; applying voltage between the cathode and the anode; controlling the electrolytic voltage, the electrolytic current density and the electrolytic quantity, so that silica in the porous block is deoxidized into nano silicon by electrolytic reduction, and the nano silicon-carbon composite material for lithium ion batteries is prepared at the cathode.

摘要翻译： 本发明涉及一种用于锂离子电池的纳米硅碳复合负极材料及其制备方法。 将由二氧化硅和碳组成的多孔电极作为原料，以二氧化硅原位电化学还原的方式通过熔融盐电解法形成含碳纳米硅的纳米硅 - 碳复合材料。 该材料的硅和碳通过纳米碳化硅连接，并且是冶金级组合，从而提高了纳米硅 - 碳复合材料的电化学循环稳定性。 本发明提供的纳米硅 - 碳复合材料的制备方法包括以下步骤：将由碳和二氧化硅粉末组成的多孔块与导电阴极集电体作为阴极复合; 使用石墨或惰性阳极作为阳极，并将阴极和阳极放入含有CaCl 2的CaCl 2电解质或混合盐熔融电解质中以形成电解槽; 在阴极和阳极之间施加电压; 控制电解电压，电解电流密度和电解量，使多孔块中的二氧化硅通过电解还原脱氧成纳米硅，并在阴极制备用于锂离子电池的纳米硅 - 碳复合材料。