铝电解阳极炭渣球磨制备Si/C复合材料及其电化学性能研究  

Electrochemical Properties of Si/C Composite Materials Prepared from Discarded Carbon Anode Residue from Aluminium Electrolysis by Ball Milling Method

作　　者：田忠良 龚培育 辛鑫 杨凯 邓朝勇 银瑰 TIAN Zhong-liang;GONG Pei-yu;XIN Xin;YANG Kai;DENG Chao-yong;YIN Gui(School of Metallurgy and Environment,Central South University,Changsha 410083,Hunan,China;Ximei Resources(Guangdong)Co Ltd,Qingyuan 513055,Guangdong,China;Hunan Special Metal Materials Co Ltd,Changsha 410013,Hunan,China)

机构地区：[1]中南大学冶金与环境学院,湖南长沙410083 [2]稀美资源(广东)有限公司,广东清远513055 [3]湖南特种金属材料有限责任公司,湖南长沙410013

出　　处：《矿冶工程》2021年第3期110-113,119,共5页Mining and Metallurgical Engineering

基　　金：湖南省自然科学基金(2020JJ1007)。

摘　　要：以危险固体废弃物铝电解阳极炭渣为碳源,采用机械球磨法制备了用于锂离子电池负极的Si/C复合材料,研究了球磨工艺参数对所得复合材料电化学性能的影响。通过XRD、SEM分析观察材料结构和形貌,循环伏安法和恒电流充放电测试表征Si/C复合材料电化学性能。结果表明,球料比对所制备复合材料电化学性能影响不明显;延长球磨时间、提高球磨转速有利于提升材料循环稳定性和可逆比容量。最佳球磨工艺参数为:球料比5∶1,球磨时间25 h,球磨转速500 r/min。该条件下所得材料在120 mA/g的电流密度下循环100圈,容量保持在382.4 mAh/g。With hazardous solid carbon anode residue discarded after aluminum electrolysis as carbon source,Si/C composites used as the anode of lithium ion batteries were prepared by using mechanical ball milling.The effects of ball milling process parameters on the electrochemical properties of the composites were studied.The structure and morphology of Si/C composites were observed by means of XRD and SEM,and the electrochemical properties of Si/C composites were characterized by cyclic voltammetry and galvanostatic charge-discharge test.The results show that the ball-material ratio has brought no obvious effect to the electrochemical properties of the prepared composites,and prolonging the ball milling time and increasing the ball milling speed are beneficial to improving the cycle stability and reversible specific capacity of materials.The optimal parameters for ball milling are finally determined as followings:ball-material ratio of 5∶1,ball milling time of 25 h,rotation speed of 500 r/min.It is found that the obtained materials can have retention rate of 382.4 mAh/g after 100 cycles at currrent density of 120 mA/g.

关 键 词：危险固体废弃物 阳极炭渣 Si/C复合材料 球磨 锂离子电池 负极材料 硅碳负极 

分 类 号：X756[环境科学与工程—环境工程]