A double transition metal Ti 2 NbC 2 T x MXene for enhanced lithium‐ion storage

Abstract MXene, an emerging two‐dimensional (2D) layered material, has received worldwide attention in various energy storage systems because of its excellent properties. Nevertheless, the low capacity of pristine MXene restricts its application in energy storage devices especially for the lithium‐ion batteries (LIBs). To address the above issue, herein, a stable and highly conductive double transition metal MXene (Ti 2 NbC 2 T x ) is successfully fabricated, which provides enlarged interlayer spacing and excellent conductivity for fast ion diffusion and charge transfer. Taking the Ti 2 NbC 2 T x as anode for LIBs, a superior specific capacity of 196.2 mAh·g −1 and an excellent long‐term cycling stability of ~ 100% after 400 cycles under 0.1 A·g −1 are achieved for LIBs. In particular, Ti 2 NbC 2 T x delivers an impressive capacity retention of 81% over 4000 cycle under 1 A·g −1 , outperforming the Ti 3 C 2 T x and various previously reported MXene‐based materials. Our results offer an attractive strategy for the future application of MXene‐based materials.