摘要
采用固相法合成了Sn-Co/B复合材料,考察了B对材料的结构和电化学性能的影响.XRD分析结果表明,Sn-Co合金由CoSn相组成,添加B能使晶粒细化并且形成CoSn2.恒流充放电测试表明,B的添加提高了Sn-Co合金的循环性能,但使放电容量略有降低.当B质量分数为4%时,Sn-Co/B复合物的首次放电容量为216 mA.h/g,经过30次循环后容量保持率达82.9%,表现出良好的结构稳定性.
The Sn-Co/B composites were synthesized using solid-state sintering and the influence of B element on the structures and electrochemical properties was analyzed.XRD results illustrate that Sn-Co alloy consists of CoSn phase.Adding B results in the refinement of grain size and the formation of CoSn2 phase.Constant-current cyclic testing show that adding B improves the cycle performance of Sn-Co alloy,but reduce its discharge capacity.The initial discharge capacity of Sn-Co/B（4%,mass fraction） is 216 mA·h/g and the capacity retention is 82.9% after 30 cycles,showing the composite has good structural stability.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2011年第10期2367-2370,共4页
Chemical Journal of Chinese Universities
基金
高等学校博士学科点专项科研基金(批准号:20092121110004)资助
