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Lithium ion battery ceramic diaphragm paste

A technology of lithium-ion batteries and ceramic diaphragms, which is applied to battery pack components, separators/films/diaphragms/spacer components, circuits, etc., can solve the electrochemical performance of battery space, unfavorable energy and power density, coating, etc. Problems such as poor layer adhesion

Inactive Publication Date: 2016-04-13
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although inorganic nanoparticles will improve the gas permeability of the separator compared with flake-like particles, the single-sided coating thickness of 4 μm will increase the internal resistance and occupy limited space in the battery, which is not conducive to electrochemical performance such as energy and power density.
[0004] It can be seen from the above that the previous technologies have defects such as thick inorganic nano-coatings and poor coating adhesion.

Method used

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  • Lithium ion battery ceramic diaphragm paste

Examples

Experimental program
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Effect test

Embodiment 1

[0014] Example 1: Weigh 7.5g of ethylene-vinyl acetate copolymer, 15g of polyvinyl alcohol aqueous solution, 140g of nano-alumina (average particle size: 200nm) powder, and 60g of alumina whisker (average aspect ratio 1:20) , polyacrylamide 2.5g, deionized water 270g, dispersant 5g. Mix in a sand mill for 30 minutes to obtain a uniform suspension; apply the suspension to a PE film with a thickness of 16 μm on both sides, dry it at 60°C, and measure the coating thickness, adhesion and heat shrinkage properties. The results are shown in Table 1.

Embodiment 2

[0015] Example 2: Weigh 7.5g of ethylene-vinyl acetate copolymer, 15g of polyvinyl alcohol aqueous solution, 120g of nano-alumina (average particle size: 200nm) powder, and 80g of alumina whisker (average aspect ratio 1:20) , polyacrylamide 2.5g, dispersant 5g, deionized water 270g. Mix in a sand mill for 30 minutes to obtain a uniform suspension; apply the suspension to a PE film with a thickness of 16 μm on both sides, dry it at 60°C, and measure the coating thickness, adhesion and heat shrinkage properties. The results are shown in Table 1.

Embodiment 3

[0016] Example 3: Weigh 7.5g of ethylene-vinyl acetate copolymer, 15g of polyvinyl alcohol aqueous solution, 75g of nano-alumina (average particle size: 200nm) powder, 125g of alumina whiskers (average aspect ratio 1:20), Polyacrylamide 2.5g, dispersant 5g, deionized water 270g. Mix in a sand mill for 30 minutes to obtain a uniform suspension; apply the suspension to a PE film with a thickness of 16 μm on both sides, dry it at 60°C, and measure the coating thickness, adhesion and heat shrinkage properties. The results are shown in Table 1.

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Abstract

The invention discloses paste for a lithium ion battery ceramic diaphragm. The lithium ion battery ceramic diaphragm comprises a basic membrane and a coating coated on a single side or double sides of the basic membrane. Paste adopted for the coating is paste which is formed in the mode that inorganic nanoparticles and whiskers are composited with a basic material and water. The inorganic nanoparticles are prepared from one of alumina, boehmite, silicon dioxide and barium sulfate, the whiskers are prepared from one of alumina and boehmite, and the basic material is prepared from a thickening agent, a dispersing agent and an adhering agent. The paste can continuously form a uniform inorganic nanometer and whisker coating on PE / PP in a roller painting mode, and the composite diaphragm with the ultra-thin coating and high adhesive force is obtained through drying. The composite diaphragm can effectively reduce the heat-shrinkage rate of the lithium ion battery ceramic diaphragm, and compared with a traditional composite diaphragm prepared from single inorganic particle paste, the ultrathin coating is favorable for increase of air permeability and ionic conductivity, and space in a battery and paste cost are saved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a slurry for a lithium ion battery ceramic diaphragm. Background technique [0002] With the increasing pressure on the ecological environment, the development of electric vehicles has become an important direction. Lithium-ion batteries have become an important power source due to their high energy density and long cycle life. Lithium-ion battery separator is a porous membrane that blocks the positive and negative electrodes, prevents internal short circuit of the battery, but allows ions to pass through, so that it can be quickly transmitted between the positive and negative electrodes during charging and discharging. It is one of the key components of lithium-ion batteries. It occupies a very important position in the materials for making batteries. The development direction of lithium-ion battery separators used as power sources is mainly focused o...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M50/40H01M50/403H01M50/449
CPCH01M50/40H01M50/409H01M50/411Y02E60/10
Inventor 杨云霞杨崇文袁双龙仝华
Owner EAST CHINA UNIV OF SCI & TECH
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