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High-performance LiMn1-xFexPO4/C cathode constructed by nano-sized spherical MnFePO4·H2O precursor via scalable reverse-titration co-precipitation strategy
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DOI：10.1039/D6NR01096B.png)
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Abstract
En 中文
To develop high-safety and high-performance olivine LiMn1-xFexPO4/C cathodes for lithium-ion batteries; a scalable synthetic route is established by employing KMnO4 as the oxidant to prepare MnFePO4·H2O precursors through a reverse-titration co-precipitation strategy. Nanosized spherical MnFePO4·H2O with uniform elemental distribution and consistent valence states is successfully obtained; effectively suppressing Mn3+ disproportionation in the aqueous co-precipitation system. During lithiation; Li+ inserts into the initially vacant M1 sites; accompanied by the reduction of Mn3+/Fe3+ to Mn2+/Fe2+; thereby converting trivalent MnFePO4·H2O into olivine LiMn1-xFexPO4. The sand-milling spray-drying (SMSD) process further enables the formation of quasi-spherical secondary particles with a narrow particle-size distribution and a continuous highly graphitized carbon coating layer; in clear contrast to the irregular agglomerates and nonuniform carbon coatings generated by conventional ball-milling/stirring-drying treatment. As a result; the L-SMSD sample delivers a high discharge specific capacity of 153.5 mAh g-1 at 0.1C; an excellent rate capacity of 120.5 mAh g-1 at 5C; and outstanding cycling stability with a capacity retention of 95.15% after 450 cycles at 1 C. Kinetic analysis further reveals that L-SMSD exhibits reduced polarization; enhanced Li+ diffusivity; and improved interfacial reaction kinetics. This work provides a practical route for the industrial-scale production of LiMn1-xFexPO4/C cathodes and is of great significance for the development of next-generation lithium-ion batteries.
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5.1
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11.6W
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