锂离子电池用Si-Fe复合电极材料的制备及其性能  

Preparation and performance of Si-Fe composite materials for lithium ion batteries

作　　者：杨娟[1] 唐晶晶[1] 娄世菊[1] 邹幽兰[1] 周向阳[1] 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2011年第4期859-864,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(50974136;51074185)

摘　　要：以Fe粉与Si粉为混合粉原料,研究经机械球磨、退火热处理后混合粉的形貌、结构与恒电流充放电性能,同时对比研究Si-Fe合金粉的性能。研究结果表明:混合粉原料经过高能机械球磨,生成了Si-Fe合金相,而Si-Fe合金的生成改善了Si作为锂离子电池负极材料的循环性能;与工业级Si-Fe合金负极材料相比,合金化程度影响了合金材料的电化学性能,合金化程度越高,合金材料电化学性能越好;而退火热处理也可以在一定程度上改善合金材料的脱嵌锂性能。Si-Fe composites were prepared by ball-milling a mixture of Si and Fe powders.The morphology,phase structures and electrochemical performances of the composites were investigated after ball-milling and annealing.An industrial Si-Fe alloy material was studied as a comparison.The results show that Si-Fe alloy phase generated in the composites after ball-milling can improve the cyclic performance of Si.By comparing the Si-Fe alloy with the industrial Si-Fe alloy,it is shown that alloying degree affects the electrochemical performance of alloy materials.Annealing process can improve the electrochemical performance of the composite to some extent.

关 键 词：Si-Fe合金 锂离子电池 Si基负极 退火 

分 类 号：O646[理学—物理化学]