免黏合剂硅碳负极材料的制备

Preparation of binder-free silicon carbon anode materials

采用球磨与后烧结处理工艺,以光伏产业废硅粉为原料,白糖为碳包覆材料,在球料比1∶1下球磨30 h, 800℃下烧结2 h,制得纳米级硅碳材料。将该材料与二氧化钛、碳纳米管混合,制得锂离子电池用免黏合剂硅碳负极材料。以0.5 C的电流在0~2 V充放电,该材料的首次放电比容量达到713 mAh/g,第100次循环时仍保持在522 mAh/g。

Nano scale silicon carbon materials were prepared by ball milling and post sintering process, using waste silicon powder from photovoltaic industry as raw material and white sugar as carbon coating material, then ball milling for 30 h with mass ratio of 1∶1 and sintering at 800 ℃ for 2 h.The obtained materials were mixed with titanium dioxide and carbon nanotubes, receiving a binder-free silicon carbon anode material for Li-ion battery.The materials exhibited an initial specific discharge capacity of 713 mAh/g when charged-discharged at a current of 0.5 C in 0-2 V,retained 522 mAh/g at the 100 th cycle.