磷酸铁锰锂材料的合成方法及结构改性的研究进展

doi:10.19964/j.issn.1006-4990.2023-0461

Abstract

Abstract:

Lithium⁃ion batteries have attracted much attention because of their high specific energy，long cycle life and no memory effect，and have been widely used in daily life.Among the existing cathode materials for lithium⁃ion batteries，lithium iron manganese phosphate cathode material is a promising cathode material for lithium⁃ion batteries with the advantages of high energy density，high specific capacity of discharge，high voltage plateau，etc.However，due to the problems of its low electrical conductivity and slow ion mobility rate，it has been restricting its development.In this paper，by analysing the effects of different Fe-Mn ratios，particle sizes and morphologies on the electrochemical performance of lithium iron manganese phosphate，it was pointed out that the small particle size porous spherical particles with an Fe-Mn ratio of 0.5∶0.5 had a good effect on improving the electrochemical performance.And it was also introduced that the optimization by using the methods of plasma doping of Mg，Ti，and Ni or the modification method of surface capping，the performance of the material would be more satisfactory.Finally，some suggestions on the development trend of lithium ferromanganese phosphate were put forward，pointing out that the improvement of the synthesis process and the development of more in⁃depth theoretical research were still the focus of future research.

Key words: cathode material, lithium iron manganese phosphate, synthesis, modification, electrochemical performance

CLC Number:

TQ131.11

SU Baocai, ZHANG Qin, XIE Yuanjian, CAI Pingxiong, PAN Yuanfeng. Advances in synthesis methods and structural modification of LiMnFePO₄ materials[J]. Inorganic Chemicals Industry, 2024, 56(7): 28-36.

Figures/Tables 11

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材料	理论比容量/ （mA·h·g^-1）	平台电压/V	安全性	成本	优势	缺点
LiNi _x Mn _y Co _z O₂	270~278	3.7	一般	高	高比容量，比能量高	循环性能、热稳定性能差，安全性能不稳定
LiFePO₄	170	3.4	好	低	循环性能好，安全性和稳定性高	导电性差，比能量低
LiFe _x Mn_1-_x PO₄	171	4.1	好	低	循环性能好，比能量高，安全性和稳定性高	导电性差
LiMn₂O₄	110~130	3.9	好	低	成本低，安全性能高	高温循环性能差
LiCoO₂	140~145	3.7	一般	高	速率性能良好	成本高，钴资源有限

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Advances in synthesis methods and structural modification of LiMnFePO₄ materials

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