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Oily ceramic slurry, preparation method thereof, positive plate coated with slurry and lithium ion battery

A technology of ceramic slurry and positive electrode sheet, applied in the direction of positive electrode, secondary battery, battery electrode, etc., can solve the problems of large swelling of water-based ceramic coating, easy phase separation and easy detachment of oil-based ceramic coating, etc., to solve the problem of swelling Large, improve flexibility, improve the effect of heat resistance

Inactive Publication Date: 2021-02-23
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problems of large swelling and easy falling off of water-based ceramic coating; easy phase separation, easy falling off and hardening of oil-based ceramic coating

Method used

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  • Oily ceramic slurry, preparation method thereof, positive plate coated with slurry and lithium ion battery
  • Oily ceramic slurry, preparation method thereof, positive plate coated with slurry and lithium ion battery
  • Oily ceramic slurry, preparation method thereof, positive plate coated with slurry and lithium ion battery

Examples

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Effect test

Embodiment 1

[0053] This embodiment provides an oily ceramic slurry and its preparation method, the raw material components of the oily ceramic slurry include: a first binder, a second binder, ceramic powder and an organic solvent; wherein, the first One binder is polyacrylic acid-polyacrylate copolymer, the molecular weight of the first binder is 600,000, and the glass transition temperature is 65°C; the second binder is polyvinylidene fluoride, and the The molecular weight of the second binder is 1.1 million, and the crystallinity is 42%; the ceramic powder is alumina ceramics (particle diameter D50 is 2 μm); the organic solvent is N-methylpyrrolidone;

[0054] The weight ratio of the first binder and the second binder is 4:1, and the mass ratio of the total mass of the first binder and the second binder to the ceramic powder is 3.5:1.

[0055] The preparation method of described oily ceramic slurry comprises:

[0056] (1) Add the powder solids of the first binder and the second binder ...

Embodiment 2

[0067]This embodiment provides an oily ceramic slurry and its preparation method, the raw material components of the oily ceramic slurry include: a first binder, a second binder, ceramic powder and an organic solvent; wherein, the first One binder is polyacrylonitrile-polyacrylamide, the molecular weight of the first binder is 300,000, and the glass transition temperature is 70°C; the second binder is polytetrafluoroethylene, and the second binder is The molecular weight of the second binder is 900,000, and the crystallinity is 45%; the ceramic powder is zirconia ceramics (particle size D50 is 0.5 μm); the organic solvent is N-methylpyrrolidone;

[0068] The weight ratio of the first binder and the second binder is 7:3, and the mass ratio of the total mass of the first binder and the second binder to the ceramic powder is 6:4.

[0069] The preparation method of described oily ceramic slurry comprises:

[0070] (1) Add the powder solids of the first binder and the second binde...

Embodiment 3

[0074] This embodiment provides an oily ceramic slurry and its preparation method, the raw material components of the oily ceramic slurry include: a first binder, a second binder, ceramic powder and an organic solvent; wherein, the first One binder is polyacrylate-polyamideimide copolymer, the molecular weight of the first binder is 400,000, and the glass transition temperature is 75°C; the second binder is polyhexafluoropropylene , the molecular weight of the second binder is 1.2 million, and the crystallinity is 43%; the ceramic powder is magnesium oxide ceramics (particle diameter D50 is 1 μm); the organic solvent is N-methylpyrrolidone;

[0075] The weight ratio of the first binder to the second binder is 6:1, and the mass ratio of the total mass of the first binder and the second binder to the ceramic powder is 2:1.

[0076] The preparation method of described oily ceramic slurry comprises:

[0077] (1) Add the powder solids of the first binder and the second binder to t...

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Abstract

The invention discloses oily ceramic slurry, a preparation method of the oily ceramic slurry, a positive plate coated with the slurry and a lithium ion battery. The oily ceramic slurry comprises the following raw material components: a first binder, a second binder, ceramic powder and an organic solvent; wherein the first binder comprises a mixture of at least two of polyacrylic acid, polyacrylate, polyacrylamide, polyacrylonitrile, polyamide or polyamideimide, the molecular weight of the first binder is 300,000-600,000, and the glass transition temperature of the first binder is 60-80 DEG C;and the second binder comprises fluorine-containing polyolefin, and the molecular weight of the second binder is 800,000-1300,000. The oily ceramic slurry provided by the invention solves the problemsthat a water-based ceramic coating is large in swelling and easy to fall off, and the oily ceramic coating is easy to split phases, easy to fall off, hard and the like.

Description

technical field [0001] The invention relates to the technical field of new energy, and relates to an oily ceramic slurry, a preparation method thereof, a positive plate coated with the slurry, and a lithium ion battery. Background technique [0002] With the continuous improvement of the energy density of the battery cell, the size of the negative electrode in the overhang design of the battery cell is gradually reduced, and the size of the negative electrode in the diaphragm is gradually narrowed. In order to reduce the risk of physical short circuit of the positive and negative poles of the battery cell caused by the overhang design or the shrinkage of the diaphragm, more and more battery manufacturers apply a ceramic insulating layer to the tab area of ​​the positive pole piece to improve Lithium battery energy density, fast charging performance, safety performance, while reducing manufacturing costs. [0003] Common ceramic coatings are divided into two types: water-bas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/36H01M4/131H01M4/136H01M4/04H01M10/0525H01M10/42
CPCH01M4/0402H01M4/0411H01M4/0419H01M4/131H01M4/136H01M4/366H01M4/623H01M4/628H01M10/0525H01M10/4235H01M2004/028Y02E60/10
Inventor 朱忠泗李倩伟何巍刘金成顾岚冰高灿
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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