Abstract Li1-XNaXFePO4 (X = 0, 0.01 or 0.05) composite cathode materials were synthesized by the simple solvothermal method. SEM images showed that Na doping had little effect on the morphology of particles, which provided a guarantee for its excellent electrochemical performance. Charge/discharge data revealed that an appropriate amount of doped Na could improve electrochemical performance. Li0.99Na0.01FePO4 showed excellent rate capacity and cycle stability, i.e., an extremely high keep in the capacity of 86.7% after 500 cycles at 10C, due to its ac facet morphology, larger lattice parameters in a and c, the enhanced electronic conductivity and Li-ion diffusion processes.

中文翻译：

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Na+原位掺杂对锂离子电池LiFePO4/C正极材料的影响

摘要 采用简单的溶剂热法合成了Li1-XNaXFePO4 (X = 0、0.01或0.05)复合正极材料。SEM图像表明，Na掺杂对颗粒的形貌影响不大，为其优异的电化学性能提供了保证。充放电数据表明，适量的Na掺杂可以提高电化学性能。Li0.99Na0.01FePO4 表现出优异的倍率容量和循环稳定性，即在 10C 下循环 500 次后容量保持率高达 86.7%，这是由于其 ac 晶面形态、较大的 a 和 c 晶格参数、增强的电子电导率和锂离子扩散过程。