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Preparation of high-performance lithium manganese iron phosphate cathode materials from ferromanganese alloy leachate
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DOI：10.1016/j.ssi.2026.117183.png)
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Abstract
En 中文
Lithium manganese iron phosphate (LiMnxFe1-xPO4) has garnered significant attention due to its theoretical energy density being approximately 20% higher than lithium iron phosphate and its superior voltage plateau. However, current synthesis processes depend on costly, highly oxidizable, and high-purity acidic reagents, such as manganese and iron, which can lead to elevated costs and the potential degradation of battery performance. This study replaces traditional reagents with manganese-iron alloy and iron powder leachate as manganese and iron sources for LiMnxFe1-xPO4 synthesis. A systematic investigation of the material synthesis process has been undertaken, resulting in the establishment of an efficient, cost-effective pathway for the preparation of this novel energy material. Experimental evidence indicates that the optimal crystal structure stability and electrochemical performance are achieved at a Mn/Fe molar ratio of 5:5, a solvothermal reaction temperature of 180 degrees C, and a calcination temperature of 700 degrees C. The material exhibits a 0.2C discharge capacity of 145.47 m Ah/g, a low impedance of 50.42 Omega, with a capacity retention rate of 91.54% after 200 cycles at 0.2C. High-rate performance testing revealed capacity retention rates of 91.81% and 94.19% after 300 cycles at 1C and 5C, respectively, demonstrating the material's outstanding long-term cycling stability.
Keywords:
Lithium iron phosphate
Electrochemical performance
Solvothermal method
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