Composite diaphragm and preparation method and use thereof

A composite diaphragm and base film technology, applied in electrical components, circuits, battery pack components, etc., can solve the problems of large particle size of LLZO, improved battery performance, complicated preparation process, etc. The effect of improved performance and improved cycle stability

Inactive Publication Date: 2019-10-29
青岛上惠新材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process is relatively complicated. The LLZO precursor needs to be prepared first, then calcined to form a powder, and then sintered to obtain LLZO. At the same time, the LLZO particle size in the coating may be large, which is not conducive to the improvement of battery performance.
CN 108258174 A discloses

Method used

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  • Composite diaphragm and preparation method and use thereof
  • Composite diaphragm and preparation method and use thereof
  • Composite diaphragm and preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] A kind of preparation method of composite diaphragm comprises the steps:

[0090] (1) Take CuSAPO-5 molecular sieve with a size of 4 μm, sulfonated melamine formaldehyde condensate (German BASF company, F10 brand) and water to prepare a coating dispersion through 3000r / min high-speed sand milling for 3.5h, wherein CuSAPO-5 The mass ratio of molecular sieve and sulfonated melamine formaldehyde condensate is 3:1, then the coating dispersion liquid, acrylate binder and polyether modified polydimethylsilane wetting agent are stirred at room temperature Prepare a coating coating solution, the content of the acrylate binder in the coating coating solution is 0.8 wt%, and the content of the polyether-modified polydimethylsilane wetting agent is 0.05 wt%;

[0091] (2) Choose a polyethylene (PE) diaphragm with a thickness of 9 μm, and dip it in the coating solution for dipping and pulling coating (lifting rising speed: 60mm / min; falling speed: 100mm / min; dipping time: After 1 m...

Embodiment 2

[0093] The difference with Example 1 is that the mass ratio of molecular sieve and sulfonated melamine formaldehyde condensate (BASF, Germany, F10 brand) described in step (1) is 2:2, and in the prepared composite diaphragm, the selective control coating The morphology is a stacked structure composed of granular and flake materials. Figure 4 This is the SEM image of the stacked structure described in this example. It can be seen from the figure that the selective control coating in the composite diaphragm presents a disordered stacked structure of inorganic components composed of granular and sheet-like materials.

Embodiment 3

[0095] The difference with Example 1 is that the mass ratio of molecular sieve and sulfonated melamine formaldehyde condensate (BASF, Germany, F10 brand) described in step (1) is 1:3, and in the prepared composite diaphragm, the selective control coating The morphology is a disordered stacking structure of granular and flake inorganic components.

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Abstract

The invention relates to a composite membrane and a preparation method and use thereof. The composite membrane comprises a base film and a selective control coating arranged on the surface of the basefilm. The selective control coating is composed of an inorganic component and an organic component distributed on the surface of the inorganic component particles. The inorganic component and the organic component are connected through any one of a chemical bond, a hydrogen bond and the van der Waals force, or a combination of at least two. According to the invention, the composite membrane takesa factor affecting battery performances (lithium ion conductivity, electrode interface, self-structural stability, electrolyte stability and the like) as a starting point; the composition and morphology of the membrane coating is selectively controlled and designed; and the conventional properties, such as mechanical strength, thermal stability, electrode interface stability, electrolyte wettability, of the acquired membrane meet requirements, and at the same time the electrochemical performance, rate performance and cycle stability of a lithium battery system are improved.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a composite diaphragm and its preparation method and application. Background technique [0002] Since the commercialization of lithium batteries, as a type of electrochemical energy storage device, it has been widely used in portable electronic devices, electric vehicles and other fields due to its advantages such as long cycle life, no memory effect and high energy density. [0003] The components of a lithium battery include a positive electrode, a negative electrode, a separator, and an electrolyte. Among them, the diaphragm is one of the four important components of the lithium battery. It can realize the conduction of lithium ions and block the electrons, and at the same time isolate the positive and negative electrodes to avoid their contact and cause a short circuit of the battery to cause safety hazards. The current traditional polyolefin separator ...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14
CPCH01M50/403H01M50/446Y02E60/10
Inventor 施利毅袁帅邱郑富王竹仪
Owner 青岛上惠新材料科技有限公司
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