Ultrathin‐Walled Bi2S3 Nanoroll/MXene Composite toward High Capacity and Fast Lithium Storage

Abstract It is extremely important to develop a high energy density power source with rapid charge–discharge rate to meet people's growing needs. Hence, the development of advanced electrode materials is the top priority. Herein, a simple yet elaborate vacuum‐assisted room‐temperature phase transfer method is reported to transform MXene nanosheets from water into organic solution. Subsequently, an in‐situ growth strategy is employed to deposit ultrathin‐walled bismuth sulfide (Bi 2 S 3 ) nanorolls on MXene surface to prepare Bi 2 S 3 /MXene composite as an efficient and high‐performance anode material for lithium‐ion batteries. Attributed to the unique nanoroll‐like structure and the strong synergistic effect, the Bi 2 S 3 /MXene‐10 composite can deliver the high discharge capacities of 849 and 541 mAh g −1 at 0.1 and 5 A g −1 , respectively. The Bi 2 S 3 /MXene‐10 electrode can deliver a high specific capacity of 541 mAh g −1 even after 600 cycles at a large current density of 1 A g −1 , proving the superb cycling stability of the Bi 2 S 3 /MXene‐10 composite. Additionally, the simple vacuum‐assisted room‐temperature phase transfer strategy can enlighten researchers to expand the potential application of MXene. Furthermore, the formation mechanism of Bi 2 S 3 nanorolls is also proposed, which may open a new avenue to design and fabricate other nanoroll‐like structures.