摘要
使用锡和锡锑合金镀层作为锂离子蓄电池的负极材料,并对其电化学性能进行了研究。循环伏安和充放电实验表明,锡电极表面在充电时也会有SEI膜的生成,而且由于电镀锡层在嵌锂后发生膨胀,导致活性物质层不断破裂,SEI膜的生成会在多次循环中存在。再次充电时,SEI膜在破裂后露出的新鲜表面上生成,进一步使活性层与基体失去电接触,电极嵌锂性能迅速衰退。经过热处理后的锡电极由于锡层与基体的结合得到增强,循环性能得到很大改进,锡锑合金层对锡的膨胀也起到了较好的抑制作用,从而改善了电极性能。
Sn and SnSb alloy coating were used as negative electrodes for Liion battery and the electrochemical performance was studied by cyclic voltammetry and charge/discharge test. The results show that SEI is formed at the surface of Sn electrode during charging. The Sn material is expanded and cracked due to the intercalation of Li into Sn lattice. The SEI is also formed after several cycles. SEI formed in the new surface of Sn during recharging, which results in the poor electrical connection between active material and substrate, and the capacity of the electrode is decreased rapidly. The performance of the annealed Sn electrode is improved because of the enhancing of interface strength between Sn layer and substrate. Moreover, expansion of Sn is inhibited by the SnSb alloy coating, so the electrochemical performance of electrode is improved.
出处
《电源技术》
CAS
CSCD
北大核心
2003年第B05期172-174,共3页
Chinese Journal of Power Sources
