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Composite positive electrode material and preparation method thereof, lithium battery positive electrode material and lithium battery

A composite positive electrode material and positive electrode material technology, applied in the field of lithium battery positive electrode material and lithium battery, composite positive electrode material and its preparation, can solve the problems of poor performance and uneven coating of high-nickel ternary positive electrodes

Pending Publication Date: 2021-01-22
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a composite positive electrode material and its preparation method, a lithium battery positive electrode material and a lithium battery, so as to solve the problem of uneven coating and graphene coating in the coating modification of lithium battery positive electrode materials in the prior art. The problem of poor performance of high nickel ternary positive electrode

Method used

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  • Composite positive electrode material and preparation method thereof, lithium battery positive electrode material and lithium battery
  • Composite positive electrode material and preparation method thereof, lithium battery positive electrode material and lithium battery
  • Composite positive electrode material and preparation method thereof, lithium battery positive electrode material and lithium battery

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preparation example Construction

[0038] In another typical embodiment of the present application, a method for preparing the aforementioned composite positive electrode material is provided, the preparation method comprising: mixing graphene, a ternary positive electrode material and a coupling agent to obtain a composite positive electrode material.

[0039] This application simply mixes graphene, ternary positive electrode material and coupling agent, so that the coupling agent bonds graphene and ternary positive electrode material to obtain a stacked structure. The stacked structure constrains the peeling of graphene, ensures the conductivity of the composite cathode material, and realizes the uniform coating of the ternary cathode material, thereby greatly reducing the gap between graphene and the ternary cathode material, thereby shortening the The path for the diffusion and conduction of lithium ions on graphene is opened, and the internal resistance of the ternary cathode material is reduced. At the sa...

Embodiment 1

[0049] Disperse 2g of 3-layer graphene with a sheet diameter of 3 μm in NMP solvent to obtain a graphene solution with a solid content of 0.35%. 97.5g of the ternary positive electrode material is mixed with the graphene solution for the first time, and passed through a high-speed disperser in the Fully disperse and stir at a rotational speed of 1000 rpm to obtain the first mixed liquid. The first mixed liquid was mixed with 0.5g KH560 coupling agent for the second time, and the high-speed disperser was used to fully disperse and stir at the speed of 1000r / min to obtain the second mixed liquid. The second mixed solution is spray-dried (parameter conditions for spray-drying are: air inlet temperature is 199° C., wind speed is 75%, sampling peristaltic pump speed is 30%, 30s automatic needle opening, high-pressure gas flow meter 10NL / min), A dried material is obtained, and the dried material can be prepared into sheets by homogenate coating without sintering to obtain a composit...

Embodiment 2

[0051] The difference between Example 2 and Example 1 is that the mass ratio of graphene (1.67g) to KH560 coupling agent (0.83g) is 2:1, and finally a composite positive electrode material is obtained.

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Abstract

The invention provides a composite positive electrode material and a preparation method thereof, a lithium battery positive electrode material and a lithium battery. The composite positive electrode material comprises graphene, a ternary positive electrode material and a coupling agent. The ternary positive electrode material is uniformly coated by using a stacked structure obtained by bonding thegraphene and the ternary positive electrode material with the coupling agent, so that the gap between the graphene and the ternary positive electrode material is greatly reduced, the diffusion and conduction path of lithium ions on the graphene is shortened, and the internal resistance of the ternary positive electrode material is reduced. Meanwhile, by utilizing a fast ion conduction channel contained in the coupling agent and the electrolyte isolation effect of graphene, the diffusion obstruction of graphene to lithium ions is further reduced, the rate capability and the cycle performance of the lithium battery are improved, and the composite positive electrode material is simple in component, wide in source and relatively low in cost.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a composite positive electrode material and a preparation method thereof, a lithium battery positive electrode material and a lithium battery. Background technique [0002] With the development of new energy vehicles, lithium-ion power batteries have attracted much attention as the most popular electric vehicle power batteries. Compared with the mature and stable commercial graphite anode, the research and development of cathode materials with high capacity, long life, low cost, safety and environmental protection is particularly urgent. The current commercial lithium battery cathode materials mainly include layered lithium cobaltate, ternary materials, spinel-structured lithium manganate and olivine-structured lithium iron phosphate. Among them, the high-nickel ternary cathode material has the advantages of high specific capacity, energy density and power density,...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/052H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/625H01M4/628H01M10/052H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 郑军华王亚州
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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