摘要:Fracture and pulverization induced by large stress during charging and discharging may lead to the loss of electrical contact and capacity fading in Sn anode materials. A good understanding of mechanical properties is necessary for their optimal design under different lithiation states. On the basis of first-principles calculations,we investigate the stress-strain relationships of Li–Sn alloys under tension. The results show that the ideal tensile strengths of Li–Sn alloys vary as a function of Li concentration,and with the increase of Li+ concentration,the lowest tensile strength decreases from 4.51 GPa (Sn) to 1.27 GPa (Li7 Sn2 ). This implies that lithiation weakens the fracture resistance of Li–Sn alloys.

出版日期:Jan 2016

类型:期刊

刊名:AIP Advances

卷号:6

期号:1

年:2016