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A surface-coated composite lithium-rich manganese-based positive electrode material and preparation method thereof

A lithium-rich manganese-based, positive electrode material technology, applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems affecting the energy density, power performance and service life of lithium-ion batteries, the capacity attenuation of lithium-ion positive electrode materials, and the shortening of cruising range. Service life and other issues to achieve the effect of improving regional restrictions, improving applications, and solving poor performance

Active Publication Date: 2019-09-10
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, lithium-rich manganese-based cathode materials perform well in normal temperature cycling and high temperature cycling, but poor performance in low temperature conditions, with severe gram capacity fading
As we all know, over-cold and over-heated environments will lead to a large capacity fading of lithium-ion cathode materials, thereby greatly shortening its cruising range and service life.
In actual use, the change of seasons and real-time temperature changes in a day will affect the energy density, power performance and service life of lithium-ion batteries, resulting in severe regional restrictions on the application of electric vehicles.

Method used

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  • A surface-coated composite lithium-rich manganese-based positive electrode material and preparation method thereof
  • A surface-coated composite lithium-rich manganese-based positive electrode material and preparation method thereof
  • A surface-coated composite lithium-rich manganese-based positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The lithium-rich manganese-based cathode material is Li 1.2 mn 0.56 Ni 0.16 co 0.08 o 2.2 , lithium iron manganese phosphate material is LiFe 0.7 mn 0.28 (Mg+Ti) 0.02 PO 4 / C, fully mixed according to the mass ratio of lithium-rich manganese-based positive electrode material to carbon-composite lithium iron manganese phosphate of 99:1.

[0042] The average particle size of the secondary particle size of lithium iron manganese phosphate material is 3um, and the carbon content is LiFe y mn 1-y-z N z PO 4 3% of the mass of / C.

[0043] The preparation method of the composite cathode material is as follows: accurately weigh the lithium-rich manganese-based cathode material Li 1.2 mn 0.56 Ni 0.16 co 0.08 o 2.2 and composite components lithium iron manganese phosphate LiFe 0.7 mn 0.28 (Mg+Ti) 0.02 PO 4 / C, use a planetary ball mill according to the ball-to-material ratio of 3:1, and perform ball milling and dry mixing at a speed of 200r / min for 2 hours and...

Embodiment 2

[0048] The lithium-rich manganese-based cathode material is Li 1.1 mn 0.1 Ni 0.9 o 2.1 , lithium iron manganese phosphate material is LiFe 0.9 mn 0.0994 (Mg+Ti) 0.006 PO 4 / C, fully mixed according to the mass ratio of lithium-rich manganese-based positive electrode material to carbon-composite lithium iron manganese phosphate of 99.5:0.5.

[0049] The average particle size of the secondary particle size of lithium iron manganese phosphate material is 8um, and the carbon content is LiFe y mn 1-y-z N z PO 4 / C 2% of mass.

[0050] The preparation method of the composite cathode material is as follows: accurately weigh the lithium-rich manganese-based cathode material Li 1.1 mn 0.1 Ni 0.9 o 2.1 and composite components lithium iron manganese phosphate LiFe 0.9 mn 0.0994 (Mg+Ti) 0.006 PO 4 / C, manual grinding after high-speed mixing, fully mixed and baked in an oven at 80°C; accurately weigh the prepared mixture and molten salt NaCl according to the molar ratio ...

Embodiment 3

[0052] The lithium-rich manganese-based cathode material is Li 1.9 mn 0.9 co 0.1 o 2.9 , lithium iron manganese phosphate material is LiFe 0.9 mn 0.071 (Mg+Ti) 0.029 PO 4 / C, fully mixed according to the mass ratio of lithium-rich manganese-based positive electrode material to carbon-composite lithium iron manganese phosphate of 95:5.

[0053] The average particle size of the secondary particle size of lithium iron manganese phosphate material is 50nm, and the carbon content is LiFe y mn 1-y-z N z PO 4 4% of the mass of / C.

[0054] The preparation method of the composite cathode material is as follows: accurately weigh the lithium-rich manganese-based cathode material Li 1.9 mn 0.9 co 0.1 o 2.9 and composite components lithium iron manganese phosphate LiFe 0.9 mn 0.071 (Mg+Ti) 0.029 PO 4 / C, after wet mixing with alcohol, manually grind, mix well and bake in an oven at 80°C; accurately weigh the prepared mixture and molten salt NaCl and KCl mixture according ...

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Abstract

The invention provides a lithium-rich manganese-based cathode material with a coated and compounded surface and a preparation method of the lithium-rich manganese-based cathode material. A lithium-rich manganese-based cathode material xLi2MnO3-(1-x)LiMO2 is used as a raw material, and is mixed and coated with a lithium ferric manganese phosphate material LiFeyMn1-yMzPO4 / C, wherein the mass of the lithium ferric manganese phosphate material LiFeyMn1-yMzPO4 / C is 0.5 to 5% of the total mass of the lithium-rich manganese-based cathode material with the coated and compounded surface; M in the lithium-rich manganese-based cathode material xLi2MnO3-(1-x)LiMO2 is at least one of transition metals Mn, Ni and Co, and x is smaller than 1 and greater than 0; N in a lithium ferric manganese phosphate material LiFeyMn1-yNzPO4 / C is any two of metals Ti, Mg, Al and Zn, y is smaller than 1 and greater than 0.6, and z is smaller than 0.03 and greater than 0.005; carbon content is 2 to 4% of the mass of the LiFeyMn1-yNzPO4 / C. A lithium ion battery prepared by utilizing the lithium-rich manganese-based cathode material with the coated and compounded surface, which is provided by the invention, has ultrahigh cycling stability in a range of 0 to 30DEG C, and can obviously improve gram capacity playing at a temperature lower than 25 DEG C.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a surface-coated composite lithium-rich manganese-based positive electrode material and a preparation method thereof. Background technique [0002] Lithium-rich manganese-based cathode material xLi 2 MnO 3 ·(1-x)LiMO 2 (M=Mn, Ni, Co, 0<x<1) has a theoretical specific capacity of up to 300mAh / g, which is twice that of the current industrialized materials such as lithium iron phosphate and lithium manganate LiMn2O4, and has low cost, High voltage, good security and other advantages. Therefore, lithium-rich manganese-based lithium-ion batteries can be considered as one of the ideal choices for energy density up to 300wh / kg, which is expected to significantly increase the cruising range of electric vehicles. However, the poor cycle stability greatly limits the commercialization progress of lithium-rich manganese-based materials. [0003] In view of these problems, the curr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 徐平红陈方高玉仙
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY