镁掺杂改性LiMn0.5Fe0.5PO4/C正极材料与性能研究

doi:10.19799/j.cnki.2095-4239.2023.0942

摘要/Abstract

摘要：

低成本磷酸锰铁锂正极材料相比于磷酸铁锂能量密度提升15%，近年来受到广泛关注，但是差的电子/离子电导率导致其功率性能不佳，难以满足实际应用的需求。本工作设计了一种具有多级结构的镁离子掺杂磷酸锰铁锂正极材料，该材料由纳米级一次颗粒自组装的二次球组成，且每个一次颗粒表面都具有均匀的碳包覆层。掺杂在晶格内的镁离子通过增加八面体LiO₆间隙提升锂离子扩散速率，表面的碳层能够在二次颗粒内构建完整的导电网络，提升电子电导率。此外，纳微多级结构不仅缩短锂离子迁移路径，还可以避免长循环过程中纳米粒子的团聚。因此，所制备的磷酸锰铁锂材料在0.1C和5C电流密度下分别具有151.8 mAh/g和113 mAh/g的高比容量，1C电流密度下循环1000次后比容量保持率高达96.2%。

关键词: LiMn_0.5Fe_0.5PO₄, 镁掺杂, 倍率性能, 锂离子电池

Abstract:

LiMn _x Fe_1-_x PO₄ (LMFP) cathode materials offer higher energy density compared to LiFePO₄, making them a subject of widespread interest. However, their practical application is hindered by low power density resulting from inferior electron/Li-ion conductivities. In this study, a Mg-doped LiMn_0.5Fe_0.5PO₄ cathode is designed and synthesized. This cathode comprises secondary spherical particles self-assembled from nanoscale primary particles, with each nanoparticle uniformly coated by a carbon layer. The introduction of Mg-ions enhances Li-ion transfer efficiency by increasing the gap of octahedral LiO₆. At the same time, the carbon coating layer improves electronic conductivity by establishing a complete conductive network within the secondary particles. Moreover, the hierarchical structure shortens the migration path of Li-ions and prevents nanoparticle aggregation during long cycling processes. Consequently, the LMFP/C-1Mg cathode exhibits a reversible specific discharge capacity of 151.8 and 113 mAh/g at 0.1C and 5C, respectively. After 1000 cycles at 1C, the capacity retention increases from 90.6% to 96.4% compared to unmodified cathodes.

Key words: LiMn_0.5Fe_0.5PO₄, Mg doping, rate performance, lithium-ion batteries

中图分类号:

TB 32

李晨威, 徐世国, 余海峰, 于松民, 江浩. 镁掺杂改性LiMn_0.5Fe_0.5PO₄/C正极材料与性能研究[J]. 储能科学与技术, 2024, 13(6): 1767-1774.

Chenwei LI, Shiguo XU, Haifeng YU, Songmin YU, Hao JIANG. Synthesis of Mg-doped LiFe_0.5Mn_0.5PO₄/C cathode materials for Li-ion batteries[J]. Energy Storage Science and Technology, 2024, 13(6): 1767-1774.

图/表 6

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参考文献 32

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镁掺杂改性LiMn_0.5Fe_0.5PO₄/C正极材料与性能研究

Synthesis of Mg-doped LiFe_0.5Mn_0.5PO₄/C cathode materials for Li-ion batteries

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