耐湿中间相炭微球的研究

The Studies on Electrochemical Performance of Cu-Ag Alloy Coated Mesocarbon Microbeads

采用化学镀的方法在石墨化中间相炭微球的表面镀覆铜银合金 ,对镀覆后的中间相炭微球进行扫描电镜分析和X射线衍射分析 ,结果表明 :铜银合金沉积在中间相炭微球的表面 ,在空气中具有较强的抗氧化能力 ;将镀覆铜银合金的中间相炭微球用于锂离子电池负极材料 ,在较高湿度下搁置后对材料进行了电化学测试 ,结果表明 :镀铜银合金中间相炭微球仍然具有 3 0 3 .8mAh/g的可逆容量和良好的循环稳定性 ,2 0次循环后放电容量保持率在 94.6%。

Graphited mesocarbon microbeads(MCMBs) were coated with Cu-Ag alloy on their surfaces by electroless plating, and SEM and XRD were used to analyze the coated MCMBs. The results have shown that the Cu-Ag alloy deposited on the surface of MCMBs has a good oxidation-resistance. As cathode material of lithium ion battery, the coated MCMBs were placed in high moisture circumstance and tested for their electrochemical performance. It was found that the coated MCMBs still have a reversible capacity of 303.8 mAh/g and good cycling stability, that is to say, their discharge capacity after 20 cycles is kept at 94.6%.