关键词: 电沉积, 锂离子电池, 铜锡合金负极, 热处理

Abstract: A thin film of active tin that can reversibly react with lithium was electrodeposited onto a copper
foil collector and employed as anode for lithium ion battery after a heat-treatment in argon atmosphere. The analysis results of scanning electron microscopy
(SEM), X-ray diffraction (XRD) and electrochemical tests of model cells show that the initial discharge specific capacity of the electrodeposited
tin electrode is higher than that of the slurry-coating tin electrode. They are 747mAh·g^-1 and 442mAh·g^-1 respectively.
The electrode surface structure, chemical composition, and crystal size are different before and after heat-treatment (e.g. tin crystal size:
102.4nm and 121.0nm, respectively). Despite of a lower initial discharge specific capacity (4.9mAh·g^-1, the annealed tin electrode has a much higher initial
coulomb efficiency (92%) and more excellent cycle performance (the capacity retention after 30 cycles: 58%) compared with no annealing tin electrode.

Key words: electrodeposition, lithium ion battery, Sn-Cu alloy anode, heat-treatment