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Lithium nickel cobalt aluminate composite material and preparation method and application thereof

A technology of nickel-cobalt-lithium-aluminate and composite materials, which is applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems of material performance degradation, and achieve the effect of avoiding performance degradation and facilitating application

Inactive Publication Date: 2017-01-04
LONG POWER SYST SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to provide a nickel-cobalt lithium aluminate that does not require secondary sintering to avoid material performance degradation for the traditional preparation method of nickel-cobalt-lithium-aluminate composite materials that requires secondary sintering to cause material performance degradation. Preparation method of composite material

Method used

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  • Lithium nickel cobalt aluminate composite material and preparation method and application thereof
  • Lithium nickel cobalt aluminate composite material and preparation method and application thereof
  • Lithium nickel cobalt aluminate composite material and preparation method and application thereof

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preparation example Construction

[0036] like figure 1 The preparation method of the shown nickel-cobalt-lithium-aluminate composite material comprises the steps:

[0037] S10. Spray the polytetrafluoroethylene emulsion on the surface of the lithium nickel cobalt aluminate powder, mix thoroughly, add the lithium iron phosphate material powder, and mix thoroughly again to obtain a mixed material.

[0038] The polytetrafluoroethylene emulsion includes polytetrafluoroethylene, nonionic surfactant and water. The solid content of the polytetrafluoroethylene emulsion is 20% to 60%. The mass ratio of the polytetrafluoroethylene and the nonionic surfactant is 99-99.5:0.5-1. The solid content is the mass percentage of the remaining part of the emulsion or coating after drying under specified conditions.

[0039] The particle size of the lithium nickel cobalt aluminate powder is 1 μm to 12 μm. The particle size of the lithium iron phosphate material powder is 50nm-200nm.

[0040] Wherein, sufficient mixing can be r...

Embodiment 1

[0058] Spray 13.75g of polytetrafluoroethylene emulsion (60% solid content) evenly on the surface of 165g of micron-sized nickel-cobalt-lithium aluminate powder, mix thoroughly after stirring with a high-speed mixer for 2 hours, and then add 135g of nano-sized ferromanganese phosphate The lithium powder was stirred by a high-speed mixer for 2 hours and then fully mixed to obtain a mixed material.

[0059] The above mixed material was moved into an oven, baked at 130° C. for 6 hours to remove moisture, and then pulverized with a high-speed pulverizer to obtain a nickel-cobalt-lithium-aluminate composite material.

Embodiment 2

[0061] Add polyvinylidene fluoride into N-methylpyrrolidone, mix well, add superconducting carbon black, and mix thoroughly to obtain conductive glue.

[0062] Add the nickel-cobalt-lithium-aluminate composite material prepared in Example 1 into the above-mentioned conductive glue solution, wherein the mass ratio of the nickel-cobalt-lithium-aluminate composite material, superconducting carbon black, and polyvinylidene fluoride is 90:5:5. The electrode slurry is obtained after the above three are fully mixed.

[0063] The above-mentioned electrode slurry is coated on the surface of the aluminum foil, followed by drying to remove N-methylpyrrolidone, and the positive electrode sheet is obtained after rolling.

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Abstract

The invention relates to a lithium nickel cobalt aluminate composite material and a preparation method and application thereof. The lithium nickel cobalt aluminate composite material comprises lithium nickel cobalt aluminate and a lithium iron phosphate material coating the surface of the lithium nickel cobalt aluminate, wherein lithium ferric manganese phosphate and the lithium nickel cobalt aluminate are glued together through polytetrafluoroethylene. By the lithium nickel cobalt aluminate composite material, the problem of battery bulging can be solved. The preparation method of the lithium nickel cobalt aluminate composite material comprises the following steps of spraying a polytetrafluoroethylene emulsion on the surface of lithium nickel cobalt aluminate powder, fully mixing, adding lithium iron phosphate powder and fully mixing again to obtain a mixed material; and drying the mixed material to remove moisture, and then carrying out crushing to obtain the lithium nickel cobalt aluminate composite material. By the method, secondary sintering on the material is not needed, the problem of performance reduction of the lithium nickel cobalt aluminate composite material caused by sintering is solved and application is facilitated. Furthermore, the invention further provides a positive pole piece comprising the composite material and a lithium-ion battery comprising the positive pole piece.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a nickel-cobalt-lithium-aluminate composite material and a preparation method and application thereof. Background technique [0002] As one of the new energy sources, lithium-ion batteries are widely used in electronic products, electric vehicles and implanted medical devices due to their high energy density and long service life. With the expansion of the application range of lithium-ion batteries, higher requirements are put forward for the safety of battery materials, battery high-rate charge and discharge performance, and cycle life. Traditional positive electrode materials mainly include lithium cobalt oxide, lithium manganate, lithium nickel cobalt manganese oxide, and lithium iron phosphate. For 3C electronic products, lithium cobalt oxide occupies a large market, but its price is relatively high. Nickel-cobalt lithium aluminate material with nickel content is low in ...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/525H01M4/505
CPCH01M4/505H01M4/525H01M4/5825Y02E60/10
Inventor 黄碧英孙喜梅李艳
Owner LONG POWER SYST SUZHOU
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