Encapsulating silicon nanoparticles into N-doped carbon film as a high-performance anode for lithium ion batteries

A flexible strategy is to exploit encapsulating Si nanoparticles into N-doping carbon film (Si-NC) that can effectively localize the Si nanoparticles, thereby solving the problem of serious volume change during cycling as well as facilitating the fast diffusion of Lit and thus achieving improved anode performance. A maximum capacity of 883.1 mAh g(-1 )at the current density of 100 mA g(-1) after 50 charge and discharge processes is achieved for Si-NC. Even at a large current density of 2000 mA g(-1), a specific capacity of 415 mAh g(-1) is maintained. Moreover, the charge capacity can still almost recover the initial capacity as the current density is reverted to 100 mA g(-1), indicating that Si-NC has a superior rate performance in lithium storage. This facile synthesis route provides a new perspective to produce Si/C composite at a low cost and large scale with good electrochemical performance.