Double Coating of Micron‐Sized Silicon by TiN@NC for High‐Performance Anode in Lithium‐Ion Batteries. Issue 9 (28th June 2019) - Liu, Qiaoyun
Abstract : Micron‐sized Si particles are successfully coated by TiN and N‐doped hard carbon (NC) via the combination of the solution method and the tape‐casting method. The double‐coated Si@TiN@NC electrode exhibits excellent electrochemical stability and rate capability, which delivers a reversible capacity of 1024 mAh g −1 at a current density of 4 A g −1 after 550 cycles, corresponding to a capacity retention of 85%. Even at 8 A g −1, the capacity still maintains 1087 mAh g −1 . Further investigation shows that the electrochemical enhancement of Si@TiN@NC is mainly attributed to the buffering effect of NC, and the excellent electronic conductivity and mechanical stability of TiN. The TiN@NC double‐layer coating structure provides a new strategy for the design of high‐performance silicon anode in lithium ion batteries (LIBs). Furthermore, the tape‐casting method is a promising way to massively produce silicon‐based composites. Abstract : The double‐coated Si@TiN@NC composite exhibits excellent lithium storage performance due to the buffering effect of N‐doped hard carbon (NC) and the excellent electronic conductivity and mechanical stability of TiN.