真空蒸镀法制备Sb膜电极及其性能

采用真空蒸镀法制备了金属Sb膜电极, 通过XRD、SEM、恒流充放电循环、循环伏安(CV)等方法, 研究了Sb膜电极的结构、形貌和电化学性能, 并对嵌脱锂机理进行了分析. 结果表明: 蒸镀后, 金属Sb为六方晶体, (003)晶面择优取向. Sb膜电极与基底铜箔的微观形貌接近, Sb金属以片层颗粒堆积在Cu箔颗粒上面. 在首次嵌锂过程中, 能观察到Li₃Sb合金的生成和Sb相的消失, 在脱锂之后, 能观察到Sb相的重新出现和Li₃Sb合金的消失, 且Sb相还是回复到(003)面择优相. Sb膜电极的首次充放电比容量分别为652和454 mAh/g, 循环16周后放电比容量还为300 mAh/g, 性能远优于Sb粉电极.

Characteristics of Sb Film Electrode Prepared by Vacuum Depositing

Vacuum depositing was employed to prepare antimony(Sb) film electrode as anode for lithium-ion batteries.The crystal structure,surface morphology,electrochemical properties and lithium insertion/ extraction characteristics of the so-obtained film electrode were investigated by XRD,SEM,constant current charge-discharge testing and CV.The results show that Sb film is obtained with a hexagonal structure and(003) preferred orientation.The morphology of Sb film is similar to that of Cu foil and Sb metal possesses a platelet shape.It can be observed that Li3Sb alloy appears and Sb phase disappears during the first lithium insertion process,and Sb phase appeares and Li3Sb alloy disappears reversibly during the lithium extraction process.The initial lithium insertion/ extraction specific capacity of Sb film can reach 652 and 454 mAh/g,respectively.And insertion specific capacity is 300 mAh/g after 16 cycles,which is larger than that of Sb powder electrode.