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Positive active material of lithium battery, preparation method thereof, and preparation method of lithium battery

A positive electrode active material and active material technology, applied in the field of batteries, can solve the problems of rapid changes in operating voltage, large differences in operating voltage, and difficult dispersion of LFP, and achieve the effects of avoiding voltage mutations, improving discharge internal resistance, and good safety performance

Inactive Publication Date: 2021-06-08
FENGFAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the ternary material and LiFePO 4 The working voltage of the two materials is quite different, and there is a sharp change in the working voltage of the mixed positive electrode battery, and the mixing of the materials in the slurry mixing process is due to the difference in particle shape and specific surface area between the ternary material and the LFP material. Make LFP not easy to disperse, thus increasing the processing difficulty in the production process

Method used

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  • Positive active material of lithium battery, preparation method thereof, and preparation method of lithium battery
  • Positive active material of lithium battery, preparation method thereof, and preparation method of lithium battery
  • Positive active material of lithium battery, preparation method thereof, and preparation method of lithium battery

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Experimental program
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Effect test

Embodiment 1

[0036] Preparation of composite cathode active material:

[0037] According to the weight ratio, LiNi with a D50 particle size of 5 μm 0.5 co 0.2 mn 0.3 o 2 (NCM523) 90.0% ternary material, 10.0% lithium vanadium phosphate (LVP) material with a D50 particle size of 50nm and 0.15% Al of the total weight of the above active material (NCM523+LVP) 2 o 3 Materials, put into the mechanical fusion machine, start mixing for 30 minutes, then add conductive carbon black super-P according to 0.5% of the total weight of the above materials, turn on the equipment for dispersing and mixing for 30 minutes, and then take out the powder to obtain a composite positive electrode active material.

[0038] Preparation of lithium-ion batteries:

[0039] According to weight percentage, 94.5% of the composite cathode active material prepared above and 2.5% of conductive agent were premixed in an intensive mixer for 5 minutes to obtain a premix.

[0040] Add 3wt% PVDF into the NMP solvent, contr...

Embodiment 2

[0043] Preparation of composite cathode active material:

[0044] According to the weight ratio, LiNi with a D50 particle size of 4 μm 1 / 3 co 1 / 3 mn 1 / 3 o 2 (NCM111) 93.0% ternary material, 7.0% lithium vanadium phosphate (LVP) material with a D50 particle size of 50nm and 0.3% TiO of the total weight of the above active material (NCM523+LVP) 2 Materials, put into the mechanical fusion machine, start mixing for 30 minutes, then add conductive carbon black super-P according to 0.5% of the total weight of the above materials, turn on the equipment for dispersing and mixing for 30 minutes, and then take out the powder to obtain a composite positive electrode active material.

[0045] Preparation of lithium-ion batteries:

[0046] According to weight percentage, 93% of the composite positive electrode active material and 4% of conductive agent prepared above were premixed in an intensive mixer for 5 minutes to obtain a premix.

[0047] Add 3wt% PVDF into the NMP solvent, cont...

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Abstract

A positive active material of a lithium battery is a composite material of a ternary material and lithium vanadium phosphate, and comprises, by weight, 80-99.9% of the ternary material, 0.1-20% of the lithium vanadium phosphate, an additive accounting for 0-1% of the total amount of the ternary material and the lithium vanadium phosphate, and a conductive agent accounting for 0-5% of the total amount of the ternary material and the lithium vanadium phosphate. The lithium vanadium phosphate is mixed and added into the layered ternary material, so that the rate discharge performance of the ternary material under low SOC is effectively improved, and the lithium battery prepared from the positive active material has excellent power performance and wide high-power working SOC range.

Description

technical field [0001] The invention relates to a positive electrode active material of a high-power lithium battery, a preparation method and a preparation method of the lithium battery, and belongs to the technical field of batteries. Background technique [0002] As a secondary battery, lithium-ion batteries have the characteristics of high energy density, long cycle life, relatively low price, and no memory effect. They have been widely used in digital products, automotive power batteries, and energy storage fields. [0003] Under the increasing dual pressure of fossil energy and environmental protection around the world, the policies and regulations of various countries and regions put forward higher and higher requirements for vehicle exhaust emissions and fuel consumption. Therefore, the development of energy-saving and new energy vehicles has become an important task for all OEMs. Direction of development. Typical energy-saving and new energy vehicles are mainly div...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M4/131H01M4/04H01M10/058H01M10/0525
CPCH01M4/0404H01M4/131H01M4/366H01M4/505H01M4/525H01M4/62H01M10/0525H01M10/058H01M2220/20Y02E60/10Y02P70/50
Inventor 俞晓峰刘慧洁杨淑娟顾志华宋帅韩晓亚李丹高良秋周宏
Owner FENGFAN
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