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Surface coating slurry and coating method thereof

A coating method and surface coating technology, which is applied to the surface coating liquid device, coating, pretreatment surface, etc., can solve the incomplete feedback of ceramic coating uniformity, inaccurate measurement, and small coating amount and other problems, to improve the overall stability and adhesion, save test time, and avoid oxidation

Inactive Publication Date: 2019-11-22
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing detection technology cannot completely feedback the uniformity of the ceramic coating
The coating amount of the ceramic coating is extremely small, which is close to the fluctuation tolerance of the active material, which leads to the inaccurate measurement due to the influence of the fluctuation of the active material when measuring the surface coating weight; due to the extreme difference in the lateral thickness of the pole piece after rolling, the fluctuation is within ±2um , so it is necessary to cut and take the pole pieces, resulting in waste of process production

Method used

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  • Surface coating slurry and coating method thereof
  • Surface coating slurry and coating method thereof
  • Surface coating slurry and coating method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A surface coating slurry, the surface coating slurry is made of raw materials including the following parts by weight: 7 parts of nano-γ-ALOOH, 0.3 parts of dibutyl phthalate, 0.6 parts of PVDF, 0.015 parts of TM-6 , 0.015 parts of polyether, 0.015 parts of polyacrylamide.

[0030] The coating method of described surface coating slurry, comprises the steps:

[0031] (1) Dissolve the binder uniformly in the solvent NMP, add nano-γ-ALOOH, transparent agent, defoamer and dispersant to it, stir and mix to form a slurry, the solid content of the slurry is 23%, Viscosity 100cp;

[0032] (2) Coat the slurry evenly on the pole piece at a coating speed of 150m / min, and conduct low-temperature vacuum heating with a vacuum degree of ≤-0.090MPa and a temperature of 50°C so that all the air bubbles in the slurry are discharged and leveled evenly. Then carry out vacuum infrared heating, and quickly dry NMP in an oxygen-deficient state to avoid color development of the slurry and ox...

Embodiment 2

[0035] A surface coating slurry, the surface coating slurry is made of raw materials including the following parts by weight: 10 parts of nano-γ-ALOOH, 0.5 parts of dibutyl phthalate, 1.0 parts of PVDF, 0.03 parts of TM-6, 0.02 parts of polyether, 0.02 parts of polyacrylamide.

[0036] The coating method of described surface coating slurry, comprises the steps:

[0037] (1) Dissolve the binder uniformly in the solvent NMP, add nano-γ-ALOOH, transparent agent, defoamer and dispersant to it, stir and mix to form a slurry, the solid content of the slurry is 25%, Viscosity 150cp;

[0038] (2) Coat the slurry evenly on the pole piece at a coating speed of 100m / min, heat in vacuum at low temperature, the vacuum degree is ≤-0.090MPa, and the temperature is 55°C, so that all the air bubbles in the slurry are discharged and evenly leveled, Then vacuum infrared heating is carried out, and the NMP is quickly dried in an oxygen-deficient state to avoid color development of the slurry an...

Embodiment 3

[0041] A surface coating slurry, the surface coating slurry is made of raw materials including the following parts by weight: 5 parts of nano-γ-ALOOH, 0.15 parts of dibutyl phthalate, 0.4 parts of PVDF, 0.03 parts of TM-6, 0.03 parts of polyether, 0.02 parts of polyacrylamide.

[0042] The coating method of described surface coating slurry, comprises the steps:

[0043] (1) Dissolve the binder uniformly in the solvent NMP, add nano-γ-ALOOH, transparent agent, defoamer and dispersant to it, stir and mix to form a slurry, the solid content of the slurry is 20%, Viscosity 100cp;

[0044] (2) Coat the slurry evenly on the pole piece at a coating speed of 200m / min, heat in vacuum at low temperature, the vacuum degree ≤ -0.090MPa, and the temperature is 60°C, so that all the air bubbles in the slurry are discharged and evenly leveled, Then vacuum infrared heating is carried out, and the NMP is quickly dried in an oxygen-deficient state to avoid the color development of the slurry ...

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Abstract

The invention provides a surface coating slurry. The surface coating slurry is prepared from the following raw materials in parts by weight of 5 to 10 parts of nano-gamma-ALOOH, 0.45 to 1.5 parts of abinding agent, 0.005 to 0.04 part of a transparent agent, 0.005 to 0.04 part of a defoaming agent and 0.005 to 0.04 part of a dispersing agent. The surface coating slurry disclosed by the invention is a transparent or semitransparent coating after being dried, so that the size of an active substance can be conveniently detected in the subsequent process, the uniformity can be detected, the size of a pole piece can be detected, the coating amount uniformity of the surface coating can be accurately fed back, the production yield is improved, and the test time is saved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a surface coating slurry and a coating method thereof. Background technique [0002] The safety performance and service life of lithium-ion batteries have always been the focus of everyone's attention, especially the rapid development and application of power batteries have made people more concerned about the safety performance and service life of lithium-ion batteries, and it is more urgent to improve the performance of power batteries. Ion battery professionals have also been making unremitting efforts, and the surface coating process of the pole piece came into being. [0003] Pole piece surface coating is to coat a thin layer of ceramic coating on the surface of the lithium-ion battery pole piece. The ceramic coating has insulation, ion conductivity and strong mechanical properties, which can effectively prevent the internal micro-short circuit of the battery...

Claims

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Application Information

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IPC IPC(8): C09D127/16C09D7/61C09D7/63C09D7/65H01M4/66H01M10/0525B05D1/26B05D3/02B05D3/04B05D7/24
CPCB05D1/265B05D3/0263B05D3/0426B05D7/24C08K2003/2227C08K2201/011C09D127/16C09D7/61C09D7/63C09D7/65H01M4/664H01M4/667H01M10/0525C08L33/26C08K3/22C08K5/12Y02E60/10
Inventor 董伟民张伟王健郭赛恺
Owner TIANJIN ENERGIES
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