摘要
采用脉冲电沉积与热处理相结合的工艺制备铜锡合金,并作为锂离子电池的负极考察其电化学性能。在集流体铜箔上直接沉积锡,然后进行热处理形成铜锡合金层。锡电极在200℃和300℃热处理过程中分别形成了Sn／Cu6Sn5／Cu3Sn和Sn／Cu3Sn复相结构,合金相的产生提高了电极的循环性能,但降低了电极的比容量。通过在锡电极表面覆铜,改变了锡电极热处理后的表面成分,由Sn／Cu6Sn5混合相转变为Cu／Cu6Sn5混合相,有效提高了锡电极长期循环的结构稳定性,使电极同时具备了较高的活性和较好的循环性能。
A pulsed electrodeposition and heat-treatment process was used to prepare copper-tin alloys for the anode of lithium ion battery. The copper-tin alloy electrodes with the structures of Sn/Cu6Sn5/Cu3Sn and Sn/Cu3Sn were obtained by plating tin on a substrate of copper foil followed by an anneal-treatment process at 200℃ and 300℃. The surface modification of copper-tin alloy electrode was tried. The improved cycle performances and the relatively low specific capacity are due to the formation of copper-tin alloy phases. The main component of the electrode surface changed from Sn/Cu6Sn5 to Cu/Cu6Sn5 after copper coating followed by heat-treatment. After surface modification, the copper-tin alloy electrode presented a high structure stability in a long cycle term. As a result, the copper-tin alloy anode was obtained with high activity and high stability.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2006年第A02期359-364,共6页
Rare Metal Materials and Engineering
关键词
锂离子电池
锡铜合金
热处理
表面修饰
lithium ion battery
tin-copper alloy
heat treatment
surface modification
