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A positive electrode sheet of lithium-ion battery with high safety performance and manufacturing method thereof

A technology for lithium-ion batteries and manufacturing methods, which is applied in the field of high-safety lithium-ion battery positive plates and their production, and can solve the problems of coating material powder dropping, affecting battery electrochemical performance, and inability to effectively improve battery safety performance, etc. , to prevent micro shedding, reduce battery interface impedance, and reduce battery short circuit

Active Publication Date: 2018-04-20
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The processing technology of the coating material and coating slurry used in the prior art is easy to cause a small amount of powder shedding of the coating material, which not only affects the electrochemical performance of the battery itself to a certain extent, but also cannot effectively improve the safety of the battery performance

Method used

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  • A positive electrode sheet of lithium-ion battery with high safety performance and manufacturing method thereof
  • A positive electrode sheet of lithium-ion battery with high safety performance and manufacturing method thereof
  • A positive electrode sheet of lithium-ion battery with high safety performance and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1-4

[0021] A method for making the positive electrode sheet of a lithium ion battery, the method is to uniformly coat the positive electrode material slurry on the current collector to obtain the current collector 1 with the positive electrode material layer 2 on the surface, and then apply the oxide ceramic slurry Evenly coated on the positive electrode material layer to form an oxide ceramic layer 3, the structure is specifically shown in figure 1 , wherein the coating method steps of the oxide ceramic layer are as follows:

[0022] 1) Mix the oxide ceramic powder with a mass percentage of 96-99.8% and 0.2-4% dispersant evenly, and then pulverize it so that the D50 of the powder is controlled between 0.1-0.8 μm, and then add deionized water to carry out Disperse, stir for 2-3 hours and then stand still for 2 hours, extract the upper and middle layer slurry, filter and then dry to obtain ultra-fine ceramic oxide powder with D50<600nm;

[0023] 2) Mix and stir the solvent and the...

Embodiment 5

[0028] Add 90% LiNi by mass percentage in 2514g NMP 1 / 3 co 1 / 3 mn 1 / 3 o 2 Mix 2880g with 6% conductive agent VGCF 192g, 4% binder PVDF 128g, stir and disperse to prepare a positive electrode slurry with a solid content of 56% and a viscosity of 10000mPa·s, and then evenly coat the positive electrode slurry on the aluminum foil Above, the thickness of the positive electrode material layer is 210 μm.

[0029] Mix 5kg of high-purity alumina powder and 102g of dispersant evenly and pulverize it to obtain a powder with a D50 of 0.7μm. Disperse the powder in deionized water and stir for 2 hours, then let it stand for 2 hours, and deposit it on the upper part 70% of the slurry was taken out, filtered, and dried to obtain ultrafine alumina powder with a D50 of 0.54 μm.

[0030] Disperse 10g of binder CMC with 235g of deionized water, stir for 3 hours, add 250g of ultrafine alumina powder, stir and disperse for 2 hours, add 10g of styrene-butadiene rubber SBR emulsion, the solid co...

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Abstract

The invention relates to a positive plate of a battery, in particular to a positive plate of a lithium-ion battery with high safety performance and a fabrication method of the positive plate. The positive plate of the lithium-ion battery comprises a current collector, a positive material layer and an oxide ceramic layer, wherein the positive material layer evenly coats the current collector; the oxide ceramic layer evenly coats the positive material layer; the current collector is an aluminum foil; the positive material layer is a mixture of a conductive agent, a binder and one or more of LiFePO<4>, LiCoO<2>, LiMn<2>O<4>, LiNiO<2>, LiMnO<2>, LiNi<x>Co<y>Mn<1-x-y>O<2> (x is smaller than 1 and greater than or equal to 0, and y is smaller than 1 and greater than or equal to 0) and xLi(Li<1 / 3>Mn<2 / 3>)O2.(1-x)LiNi<y>Co<z>Mn<1-y-z>O2 (x is smaller than 1 and greater than 0, y is smaller than 1 and greater than or equal to 0 and z is smaller than 1 and greater than or equal to 0); and the oxide ceramic layer is a mixture of oxide ceramic powder, a dispersing agent and the binder.

Description

technical field [0001] The invention relates to a positive electrode sheet of a battery, in particular to a positive electrode sheet of a lithium ion battery with high safety performance and a manufacturing method thereof. Background technique [0002] A layer of high-safety coating is applied on the surface of the existing positive electrode material layer. Common coating types include relatively safe lithium-ion positive electrode oxide materials, nano-scale inorganic materials, and polymer materials. In recent years, studies have found that coating on the positive electrode material is also one of the important means to improve the safety performance of lithium-ion batteries, and the selection of coating materials and the processing technology of coating materials are crucial to the improvement of battery safety performance. The processing technology of the coating material and coating slurry used in the prior art is easy to cause a small amount of powder shedding of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/04H01M4/139H01M10/42
CPCY02E60/10
Inventor 周伟瑛殷月辉吕豪杰
Owner WANXIANG 123 CO LTD
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