Fe-doped Sn@ 3D carbon lithium-ion battery anode mesoporous material with sodium alginate as the carbon source

Sn-based materials receive a lot of attention because of their high theoretical specific capacity, acceptable price, and good electrical conductivity. However, Sn-based materials have a large volume expansion in the circulation process, leading to the rapid decay of capacity. According to the ion diffusion time formula: t = L2/2D, where L is the diffusion length or the particle size, and D is the diffusion constant of the ions and the electrons. It can be seen that reducing the particle size can significantly improve the multiplier performance of the material. At present, the main methods for preparing nano-sized metal/carbon composites are the high-energy ball grinding method, hydrothermal method, calcined metal, and organic matter precursor. In this paper, sodium alginate was used as a precursor system for the Fe-doped Sn @3D carbon composite material, which was applied to the lithium-ion battery anode to obtain excellent electrochemical performance (1133.5 mAhg −1 after 200 cycles at 0.2 Ag −1 ). The increase in the specific surface area of Fe-doped Sn @3D carbon also increases the charge transfer efficiency and further improves the multiplier performance of the electrode. Meanwhile, the nano-size and structure can better buffer the volume expansion and protect the structure of the electrode.