Facile Synthesis of FePS3 Nanosheets@MXene Composite as a High-Performance Anode Material for Sodium Storage
Yonghao Ding, Yu Chen, Na Xu, Xintong Lian, Linlin Li, Yuxiang Hu, Shengjie Peng
Abstract
Abstract Searching for advanced anode materials with excellent electrochemical properties in sodium-ion battery is essential and imperative for next-generation energy storage system to solve the energy shortage problem. In this work, two-dimensional (2D) ultrathin FePS 3 nanosheets, a typical ternary metal phosphosulfide, are first prepared by ultrasonic exfoliation. The novel 2D/2D heterojunction of FePS 3 nanosheets@MXene composite is then successfully synthesized by in situ mixing ultrathin MXene nanosheets with FePS 3 nanosheets. The resultant FePS 3 nanosheets@MXene hybrids can increase the electronic conductivity and specific surface area, assuring excellent surface and interfacial charge transfer abilities. Furthermore, the unique heterojunction endows FePS 3 nanosheets@MXene composite to promote the diffusion of Na + and alleviate the drastic change in volume in the cyclic process, enhancing the sodium storage capability. Consequently, the few-layered FePS 3 nanosheets uniformly coated by ultrathin MXene provide an exceptional reversible capacity of 676.1 mAh g −1 at the current of 100 mA g −1 after 90 cycles, which is equivalent to around 90.6% of the second-cycle capacity (746.4 mAh g −1 ). This work provides an original protocol for constructing 2D/2D material and demonstrates the FePS 3 @MXene composite as a potential anode material with excellent property for sodium-ion batteries.