Ionic Liquid‐Assisted Anchoring SnO<sub>2</sub> Nanoparticles on Carbon Nanotubes as Highly Cyclable Anode of Lithium Ion Batteries
Kuiming Liu, Shengming Zhu, Xufeng Dong, Hao Huang, Min Qi
Abstract
Abstract The commercialization of SnO 2 ‐based anode materials for lithium ion batteries (LIBs) has been hindered by the huge volume change and fast capacity fading. Ionic liquid (IL)‐assisted strategy for the synthesis of SnO 2 @IL‐modified carbon nanotubes (SnO 2 @IL–carbon nanotubes (CNTs)) hybrid nanostructure is proposed with the SnO 2 nanoparticles uniformly and strongly grafting on the CNTs. With low surface tension, IL as the solvent is beneficial to the dispersion of CNTs and the formation of small SnO 2 nanoparticles, thus improving the interface contact between SnO 2 and CNTs. Furthermore, the interface interaction can be also strengthened by IL‐assisted interface modification, substantially facilitating the electron/ion transport in SnO 2 and meanwhile preventing its continuous volume change during lithiation. When used as the anode for LIBs, SnO 2 @IL–CNTs achieve a high reversible capacity of 1438.1 mA h g −1 with an excellent cycling stability (800 cycles).