摘要
将反相微乳液工艺用于制备纳米储锂合金,成功地制备出了具有非晶结构的Cu-Sn合金纳米颗粒,避免了电极的粉化问题,改善了合金负极的循环性能．但纳米合金表面固体电解质膜(SEI膜)的成膜反应造成了较大的不可逆容量．纳米颗粒之间的接触电阻导致了电极导电性较差．实验证明,纳米Cu-Sn合金的颗粒尺寸与电极中导电剂含量的匹配问题对电极的电化学性能有较大的影响,当导电剂含量为40％时,粒径范围在50-60 nm的Cu-Sn合金具有最佳的电化学性能．
Nanometer particles of Cu-Sn alloy, a kind of lithium storage material, with amorphous structures were successfully prepared by a reverse microemulsion technique. Because the electrode pulverization problem can be relieved by its small particle size, nanometer Cu-Sn alloy anode has a good cycle performance. However, a great irreversible capacity was caused by the formation of a SEI layer on the surface of nanometer alloy and the contact resistance between nanometer particles resulted in the poor electric conductivity. It is proved by experiments that the match of particle size and conductive agent content has a great impact on the electrochemical performance of the nanometer Cu-Sn alloy anode. When the conductive agent content increased to 40%, the nanometer Cu-Sn alloy with particle size of 50-60 nm presented the best performance.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2006年第7期727-732,共6页
Acta Metallurgica Sinica
基金
清华大学基础研究基金资助项目985042021~~
