氟掺杂对LiMn0.8Fe0.2PO4/C正极材料电化学性能的影响

doi:10.19964/j.issn.1006-4990.2024-0054

Abstract

Abstract:

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 PO₄^3- partial oxygen site，LiF was used as a dopant to improve the electrochemical performance of lithium manganese iron phosphate.LiMn_0.8Fe_0.2PO_4-_X F₂_X /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 LiMn_0.8Fe_0.2PO₄/C cathode materials were studied.The analyses demonstrated that fluorine could be incorporated into LiMn_0.8Fe_0.2PO₄/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 LiMn_0.8Fe_0.2PO₄/C resulted in good reversible capacity and rate capability.LiMn_0.8Fe_0.2PO_3.99F_0.02/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, LiMn_0.8Fe_0.2PO₄, cathode material, F-doping

CLC Number:

TM911

LIU Jiasheng, LUO Xiaoqiang, HOU Cuihong, XUE Lingwei. Effects of fluorine doping on electrochemical behavior of LiMn_0.8Fe_0.2PO₄/C cathode materials[J]. Inorganic Chemicals Industry, 2024, 56(11): 45-50.

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X	a/Å	b/Å	c/Å	V/Å³
0	6.033 97	10.441 92	4.691 01	295.56
0.003	6.029 95	10.411 56	4.694 47	294.72
0.005	6.047 55	10.357 42	4.703 92	294.64
0.010	6.059 33	10.351 02	4.730 51	294.47
0.020	6.026 84	10.353 23	4.708 76	293.81

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Effects of fluorine doping on electrochemical behavior of LiMn_0.8Fe_0.2PO₄/C cathode materials

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Effects of fluorine doping on electrochemical behavior of LiMn0.8Fe0.2PO4/C cathode materials