In this work, LiFeMnPO@C (x = 0, 0.01, 0.02, 0.03) cathode materials were obtained by a simple co-precipitation method and heat treatment, and the influence of Mn-doped modification on the electrochemical performance of LiFePO@C cathode materials was investigated. Results show that by doping an appropriate amount of Mn, the cell volume became larger, and the electronic conductivity increased, which improved the Li diffusion rate and thus its rate capability and cycle performance of Li-ion batteries. Among them, LiFeMnPO@C showed superior lithium storage capability; the discharge capacity can reach 150.7 mAh g at 0.1 C. The cell could discharge up to 155.9 mAh g at 1 C under high temperature at 45 °C, which was higher than LiFePO@C (142 mAh g) under the same test conditions. The discharge capacity of 1 C at room temperature was 139.9 mAh g, and the cycle stability was 95.9% after 200 cycles. It showed that it had good rate capability and excellent cycle performance. These results indicate that Mn-doped LFP is a simple and effective strategy for developing high-performance cathode materials.

中文翻译：

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锰掺杂LiFePO4@C作为高性能锂离子电池正极材料

本工作通过简单的共沉淀法和热处理得到了LiFeMnPO@C (x = 0, 0.01, 0.02, 0.03)正极材料，并研究了Mn掺杂改性对LiFePO@C正极电化学性能的影响材料进行了调查。结果表明，通过掺杂适量的Mn，电池体积变大，电子电导率增加，从而提高了Li扩散速率，从而提高了锂离子电池的倍率性能和循环性能。其中，LiFeMnPO@C表现出优越的储锂能力； 0.1 C放电容量可达150.7 mAh g。该电池在45℃高温下1 C放电容量可达155.9 mAh g，高于相同测试条件下LiFePO@C（142 mAh g）。室温1C放电容量为139.9mAh·g，循环200次后循环稳定性为95.9%。表明其具有良好的倍率性能和优异的循环性能。这些结果表明，Mn掺杂LFP是开发高性能正极材料的一种简单而有效的策略。