3D interwoven MXene networks fabricated by the assistance of bacterial celluloses as high-performance cathode material for rechargeable magnesium battery

3D interwoven Ti₃C₂ MXene networks fabricated with the assistance of bacterial celluloses (BC) are used as a cathode material for rechargeable magnesium ion battery, which delivers an impressive specific capacity (171 mA h g⁻¹ at 50 mA g⁻¹) and good cycling performance (88% capacity retention after 100 cycles). In contrast, pure Ti₃C₂ film only shows a reversible capacity of less than 10 mA h g⁻¹ at 50 mA g⁻¹. Compared to pure Ti₃C₂ film (d = 1.4 nm), 3D interwoven Ti₃C₂ MXene networks (BC/Ti₃C₂ film) possess larger interlayer spacing (d = 1.8 nm), benefiting the magnesium migration, which is proved through DFT calculation. BC/Ti₃C₂ film with porous surface is observed through FESEM image. While for Ti₃C₂ film, all flakes stack together. As expected, the diffusion paths for magnesium ions are optimized in the BC/Ti₃C₂ film. Besides, Galvanostatic Intermittent Titration Technique shows a much larger magnesium diffusion coefficient of BC/Ti₃C₂ film than that of pure Ti₃C₂ film. Therefore, the larger interlayer spacing, optimized diffusion paths and larger magnesium diffusion coefficient contribute to the high electrochemical performance. Moreover, the working mechanisms of magnesium ion battery equipped with BC/Ti₃C₂ film are investigated. This work provides a new insight to design MXene-based cathode materials with high-performance.