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Battery diaphragm with irregularly-shaped particle coating and preparation method of battery diaphragm

A battery separator, irregular technology, applied in the field of battery separator with irregular particle coating and its preparation, can solve the problem of poor heat resistance of polyolefin separator, achieve improved heat resistance, low thermal shrinkage, and guarantee safety effect

Active Publication Date: 2022-08-02
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the technical problem of poor heat resistance of polyolefin separators, a battery separator with irregular particle coating and a preparation method thereof are provided

Method used

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  • Battery diaphragm with irregularly-shaped particle coating and preparation method of battery diaphragm
  • Battery diaphragm with irregularly-shaped particle coating and preparation method of battery diaphragm

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A battery separator with a coating of irregular-shaped particles, comprising a PP base film and a coating covering the surface of the PP base film, the irregular-shaped particles are uniformly distributed in the coating, and the structure of the irregular-shaped particles is including TiO 2 Spherical particles coated with PMMA (hereinafter abbreviated as TiO) 2 / PMMA), and a PAN polymer layer polymerized after partially swelling the surface-coated PMMA, the irregular-shaped particles are abbreviated as TiO 2 / PMMA / PAN.

[0025] The preparation of irregular-shaped particles includes the following steps: 2 / PMMA spherical particles dispersed in water to form a dispersion with a solid content of 8 wt%, N 2 After bubbling for 30min to deoxygenate, add AN, swell at room temperature, then heat up to 65°C, add KPS initiator to carry out polymerization reaction for 2h, the raw material of polymerization reaction is TiO 2 The mass ratio of / PMMA spherical particles, AN, and ...

Embodiment 2

[0030] The structure and preparation of the battery separator with irregular-shaped particle coating in this example is the same as that in Example 1, the difference is that in the preparation of the battery separator with irregular-shaped particle coating, the slurry is prepared according to the mass percentage of 100 %, the TiO 2 / PMMA / PAN irregular-shaped particles accounted for 25%, aqueous thickener accounted for 30%, aqueous binder 4%, aqueous wetting agent 0.2%, and the balance was water.

Embodiment 3

[0032] The structure and preparation of the battery separator with irregular-shaped particle coating in this example is the same as that in Example 1, the difference is that in the preparation of the battery separator with irregular-shaped particle coating, the slurry is prepared according to the mass percentage of 100 %, the TiO 2 / PMMA / PAN irregular-shaped particles accounted for 25%, aqueous thickener accounted for 35%, aqueous binder 8%, aqueous wetting agent 0.3%, and the balance was water.

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Abstract

The invention relates to a battery diaphragm with an irregularly-shaped particle coating and a preparation method thereof, the battery diaphragm comprises a diaphragm base membrane and a coating covering the surface of the diaphragm base membrane, and irregularly-shaped particles are uniformly distributed in the coating; each irregular-shaped particle structurally comprises a spherical particle formed by coating the surface of an inorganic particle with PMMA (Polymethyl Methacrylate) and a polymer layer formed by partially swelling and polymerizing the PMMA coated with the surface, and the glass-transition temperature of the polymer layer is higher than 85 DEG C; the preparation method comprises the following steps: dispersing irregularly-shaped particles in water, adding a water-based thickening agent, a water-based adhesive and a water-based wetting agent while stirring, uniformly stirring to obtain slurry, uniformly coating one side or two sides of a diaphragm base material with the slurry, drying, and rolling to obtain the battery diaphragm with the irregularly-shaped particle coating. The hot-pressing peel strength between the coating and the pole piece is relatively good, and meanwhile, the coating has relatively good heat resistance.

Description

technical field [0001] The invention relates to the technical field of battery separators with coatings, in particular to a battery separator with irregular-shaped particle coatings and a preparation method thereof. Background technique [0002] As one of the four major components of lithium batteries, the battery separator is mainly used to separate the positive and negative electrodes, and to absorb the electrolyte to allow lithium ions to pass through. For lithium batteries of 3C products, only using polyolefin separators, such as PP separators, PE separators, etc., can basically meet the battery performance. However, in recent years, with the vigorous development of the new energy vehicle industry, higher requirements have been placed on the performance of the separator used in the power battery, such as the adhesion between the pole piece and the better heat resistance. [0003] Polyolefin separators are currently the most widely used lithium battery separators, but th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/431H01M50/403H01M50/443
CPCH01M50/431H01M50/403H01M50/443Y02E60/10
Inventor 王林张立斌赵海玉陈朝晖
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD
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