Double Coating of Micron‐Sized Silicon by TiN@NC for High‐Performance Anode in Lithium‐Ion Batteries

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.