Improved Lithium‐Ion and Sodium‐Ion Storage Properties from Few‐Layered WS 2 Nanosheets Embedded in a Mesoporous CMK‐3 Matrix

An integrated WS 2 @CMK‐3 nanocomposite has been prepared by a one‐step hydrothermal method and then used as the anode material for lithium‐ion and sodium‐ion batteries. Ultrathin WS 2 nanosheets have been successfully embedded into the ordered mesoporous carbon (CMK‐3) framework. Owing to the few‐layered nanostructure of WS 2 , as well as the high electronic conductivity and the volume confinement effect of CMK‐3, the material shows larger discharge capacity, better rate capability, and improved cycle stability than pristine WS 2 . When tested in lithium‐ion batteries, the material delivers a reversible capacity of 720 mA h g −1 after 100 cycles at a current density of 100 mA g −1 . A large discharge capacity of 307 mA h g −1 is obtained at a current density of 2 A g −1 . When used in sodium‐ion batteries, the material exhibits a capacity of 333 mA h g −1 at 100 mA g −1 without capacity fading after 70 cycles. A discharge capacity of 230 mA h g −1 is obtained at 2 A g −1 . This excellent performance demonstrates that the WS 2 @CMK‐3 nanocomposite has great potential as a high‐performance anode material for next‐generation rechargeable batteries.