Correlating composition and structures with battery performance is key aspect of electrode material design and improvement. Here utilizing in situ open cell transmission electron microscopy, we studied the in situ cycling rate performance of vanadium oxide coated tin dioxide nanowire electrode by tuning the lithiation/delithiation current. In situ results show that the good rate performance of such high capacity compositional material lies in the layered vanadium oxide coating strategy. For cycling at high rate, the layered vanadium oxide also serves as fast ions and electrons transportation route while tin nanoparticles aggregate to the surface with sizes controlled by the coating layer, cycle induced volume change is released to the surface and excellent mechanical tolerance of tin nanoparticle and inner nanowire ensure improved cyclability of the electrode.

将组成和结构与电池性能相关联是电极材料设计和改进的关键方面。在这里，利用原位开孔透射电子显微镜，我们通过调整锂化/去锂化电流，研究了氧化钒包覆的二氧化锡纳米线电极的原位循环速率性能。原位结果表明，这种高容量组成材料的良好倍率性能在于层状钒氧化物涂层策略。为了高速循环，层状氧化钒还可以作为快速的离子和电子传输途径，而锡纳米颗粒聚集到表面时，其大小受涂层控制，循环引起的体积变化释放到表面，并且锡纳米颗粒具有出色的机械耐受性内部纳米线确保了电极的可循环性。