Magnetic Field Facilitated Resilient Chain-like Fe₃O₄/C/Red P with Superior Sodium Storage Performance

Red phosphorus (P) has recently attracted lots of interest due to its extraordinary theoretical capacity of 2596 mAh g^-1 in sodium-ion batteries (SIBs). However, it is challenging to solve the stability in the preparation process, while enhancing its low conductivity and solving the structural degradation caused by the enormous volume expansion (>490%) during cycling have become the targeted pursuits. Here, we creatively introduced the magnetic stimuli source to solve both of the preparation and the volume swelling force issues. In the precedence of magnetic field, the increased pressure in the sample room drives the homogeneous red P particles to finely deposit on the surface of Fe₃O₄/C. The chain-like Fe₃O₄/C/red P was successfully prepared assisted by the magnetic field. Simultaneously, considering that the speeded up movements for both electrons and sodium ions depended on Lorentz force, the electrochemical performance of such anode material is optimized by tuning the arrays in collector. It is noted that the nanostructure is elastically rearranged for the resistance of volume swelling force. Compared with the single Fe₃O₄/C/red P particles, for the magnetic fabricated Fe₃O₄/C/P chain structure, the electrostatic potential for reconstructing the chain-like Fe₃O₄/C/P is the largest. Such configured chain-like anode material exhibits an extraordinary cyclic performance and superior rate capability (692 mAh g^-1 at 2000 mA g^-1). The magnetic stimuli source bridges both the preparation optimization and the electrochemical performance enhancements for the red P based anode materials.