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Effects of fluorine doping on electrochemical behavior of LiMn0.8Fe0.2PO4/C cathode materials
Received date: 2024-01-29
Online published: 2024-02-26
With the popularization and promotion of new energy vehicles and lithium-ion batteries，the electrochemical performance of lithium manganese iron phosphate as cathode material for lithium-ion batteries needs to be further optimized.Among the modification methods of lithium ferromanganese phosphate，there are few studies on anion substitution.By the modification method of F- replacing PO43- partial oxygen site，LiF was used as a dopant to improve the electrochemical performance of lithium manganese iron phosphate.LiMn0.8Fe0.2PO4-X F2X /C（X=0.003，0.005，0.01，0.02） materials were prepared by high temperature solid state method using Li2CO3，LiF，MnCO3，FeC2O4·2H2O，NH4H2PO4 and sucrose as raw materials，and the effects of different fluorine doping contents on the electrochemical properties of LiMn0.8Fe0.2PO4/C cathode materials were studied.The analyses demonstrated that fluorine could be incorporated into LiMn0.8Fe0.2PO4/C without altering the olivinestructure，but slightly changing the lattice parameters and having little effect on the particle sizes.The results of electrochemical measurement showed that fluorine doping in LiMn0.8Fe0.2PO4/C resulted in good reversible capacity and rate capability.LiMn0.8Fe0.2PO3.99F0.02/C exhibited highest initial capacity and best rate performance.Its discharge capacities at 0.1C and 5C rates were 155.1 mA·h/g and 128.6 mA·h/g，respectively.After 500 cycles at 1C，the capacity retention was increased from 73.3% to 96.1% compared with the unmodified materials.
Key words： electrochemical performance; LiMn0.8Fe0.2PO4; cathode material; F-doping
LIU Jiasheng , LUO Xiaoqiang , HOU Cuihong , XUE Lingwei . Effects of fluorine doping on electrochemical behavior of LiMn0.8Fe0.2PO4/C cathode materials[J]. Inorganic Chemicals Industry, 2024 , 56(11) : 45 -50 . DOI: 10.19964/j.issn.1006-4990.2024-0054
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