采用电沉积方法直接在铜集流体上沉积一层可与锂反应的活性金属锡,在氩气气氛中烧结处理后作为锂离子电池的负极.扫描电镜和X射线衍射分析及模拟电池的电化学性能测试结果表明:电沉积工艺制备的锡电极与传统的涂浆法制备的锡电极相比,其首次循环的放电比容量有很大提高,即由442mAh·g-1提高到747mAh·g-1;烧结处理前后电极表面结构、组成和粒度大小不同,锡晶粒粒度分别为102.4、121.0nm;烧结处理后,虽然首次循环的比容量下降为409mAh·g-4,但库仑效率有很大提高,达到92％,30次循环的容量保持率达到58％.
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.
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