Tin phosphide (Sn₄P₃) holds great promise because sodium-ion batteries use this material as an anode with impressive theoretical capacity. In this paper, it is reported that Co-doped Sn₄P₃ is embedded into carbon-based materials and SnCoP/C with a porous skeleton is prepared. As a result, SnCoP/C-2, as the material utilized in sodium-ion battery anodes, exhibits reversible capacities at 415.6, 345.9, and 315.6 mAh g^–1 at current intensities of 0.5, 1.0, and 2.0 A g^–1, respectively. The electrochemical reversibility, cycle stability, and rate performance of SnCoP/C samples are obviously better than those of Sn₄P₃/C. Cobalt in SnCoP/C stabilizes the conductive matrix of tin phosphide and promotes the diffusion kinetics of sodium. These results show that, with an appropriate amount of cobalt doping, highly dispersed nanoparticles can be formed in the tin phosphide matrix, which can significantly enhance the cycle stability of tin-based electrode materials.

中文翻译：

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锡钴双金属磷化物纳米粒子作为钠离子电池负极的研究

磷化锡 (Sn ₄ P ₃ ) 前景广阔，因为钠离子电池使用这种材料作为阳极，具有令人印象深刻的理论容量。该论文报道了将Co掺杂Sn ₄ P ₃嵌入到碳基材料中，制备了具有多孔骨架的SnCoP/C。因此，SnCoP/C-2作为钠离子电池负极材料，在0.5、1.0和2.0 A g ^{–1电流强度下表现出415.6、345.9和315.6 mAh g –1 的}可逆容量，分别。 SnCoP/C样品的电化学可逆性、循环稳定性和倍率性能明显优于Sn ₄ P ₃ /C。 SnCoP/C 中的钴可稳定磷化锡的导电基质并促进钠的扩散动力学。这些结果表明，适量的钴掺杂可以在磷化锡基体中形成高度分散的纳米粒子，从而显着增强锡基电极材料的循环稳定性。