Li Jilan, Liu Zhangbin, Ma Jiarou
School of Chemistry and Materials Engineering, Liupanshui Normal University, Liupanshui, Guizhou, 553004, China.
College of Environmental and Chemical Engineering, Dalian University, Dalian, Liaoning, 116622, China.
Sci Rep. 2025 Jul 31;15(1):28004. doi: 10.1038/s41598-025-12971-y.
Lithium manganese phosphate (LiMnPO) is the most promising candidate for the next generation of lithium-ion battery cathode materials due to its 4.1 V(vs. Li/Li) high voltage platform. At present, the discharge rate performance and cycle stability are still poor. And here, various Fe, Ni co-doped carbon-coated LiMnPO composites materials LiMnPO/C were successfully prepared using coprecipitation and solvothermal methods. Morphological and electrochemical performance analyses were conducted on the LiMnPO/C materials prepared by different methods to explore the relationship between material morphology and electrochemical performance. Compared with the coprecipitation method, LiMnPO/C prepared by the solvothermal method has a smaller particle size and a more regular morphology. Moreover, after the addition of glucose as an auxiliary, the particles exhibit a spindle-shaped porous structure, leading to improved cycling performance and rate capability, and demonstrating superior electrochemical properties. At 0.1, 0.2, 0.5, 1, and 2 C, the discharge specific capacities are 121.4, 102.7, 91.2, 81.5, and 53.7 mAh g, respectively. After 100 cycles at 1 C rate, 91% of the initial capacity is still retained. The above results indicate selecting appropriate preparation methods and controlling the structure and morphology of the material, the electrochemical activity of LiMnPO can be directly influenced, which providing a new approach to improve the electrochemical performance of LiMnPO.
磷酸锂锰（LiMnPO）因其4.1V（相对于Li/Li）的高电压平台而成为下一代锂离子电池正极材料最有前景的候选者。目前，其放电倍率性能和循环稳定性仍然较差。在此，采用共沉淀法和溶剂热法成功制备了各种铁、镍共掺杂碳包覆的LiMnPO复合材料LiMnPO/C。对通过不同方法制备的LiMnPO/C材料进行了形貌和电化学性能分析，以探索材料形貌与电化学性能之间的关系。与共沉淀法相比，溶剂热法制备的LiMnPO/C粒径更小，形貌更规则。此外，添加葡萄糖作为助剂后，颗粒呈现纺锤形多孔结构，导致循环性能和倍率性能得到改善，并展现出优异的电化学性能。在0.1C、0.2C、0.5C、1C和2C下，放电比容量分别为121.4、102.7、91.2、81.5和53.7 mAh g。在1C倍率下循环100次后，仍保留91%的初始容量。上述结果表明，选择合适的制备方法并控制材料的结构和形貌，可以直接影响LiMnPO的电化学活性，这为提高LiMnPO的电化学性能提供了一种新方法。
