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Porous membrane and lithium ion battery

A technology of lithium-ion batteries and porous membranes, which is applied in the direction of secondary batteries, battery electrodes, battery components, etc., can solve the problems of lithium-ion battery cycle capacity reduction and impact on service life, and achieve excellent rate performance and cycle performance. The effect of reducing the probability of hole plugging and improving dynamic performance

Active Publication Date: 2019-10-22
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the cycle of lithium-ion batteries, as the charge and discharge progress, there will be a gap between the electrodes and the separator, resulting in a decrease in the cycle capacity of the lithium-ion battery, thereby affecting its service life

Method used

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  • Porous membrane and lithium ion battery
  • Porous membrane and lithium ion battery
  • Porous membrane and lithium ion battery

Examples

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preparation example Construction

[0032] According to the second aspect of the present application, there is provided a method for preparing a porous film, which is used to prepare the porous film described in the first aspect of the present application, comprising the steps of: (1) mixing the inorganic particles with a binder, and then adding the second A solvent and uniformly stirred to obtain a coating liquid, wherein the binder is dissolved in the first solvent; (2) the coating liquid is evenly coated on at least one surface of the substrate to form a wet film; (3) the The matrix of the wet film is immersed in the coagulation liquid for phase inversion, wherein the coagulation liquid includes the second solvent and the third solvent, and the second solvent and the third solvent are mutually soluble; (4) after the phase inversion is completed, dry treatment is performed to obtain the surface with The substrate of a porous membrane, wherein the average wall thickness between adjacent pores in the porous membr...

Embodiment 1

[0072] (1) Preparation of negative electrode sheet

[0073] Negative electrode active material artificial graphite, binder styrene-butadiene rubber, conductive agent conductive carbon black (Super P) are mixed with deionized water at a mass ratio of 92:3:5 to make negative electrode slurry, and then the negative electrode slurry is evenly coated Cover the positive and negative sides of the copper foil of the negative electrode current collector, and then dry it at 85°C to form a negative electrode active material layer, and then perform cold pressing, slitting, cutting, and welding the negative electrode lugs to obtain the negative electrode sheet.

[0074] (2) Preparation of positive pole piece

[0075] The positive electrode active material lithium cobalt oxide (LiCoO 2 ), the binder polyvinylidene fluoride (PVDF), and the conductive agent conductive carbon black (Super P) are dissolved in the solvent N-methylpyrrolidone (NMP) at a mass ratio of 97:1.5:1.5, and stirred even...

Embodiment 2

[0083] In this embodiment, the preparation methods of the negative pole piece, the positive pole piece, the electrolyte solution, and the lithium-ion battery are the same as the corresponding preparation methods described in Example 1. The preparation method of the isolation film is the same as that described in Example 1, except that the solid content of the coating liquid is 10%.

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Abstract

The invention provides a porous membrane and a lithium ion battery. The porous membrane provided by the invention has excellent cohesiveness, and the pore structure of the porous membrane can be wellmaintained after being soaked in an electrolyte, so that the probability of pore blockage of the porous membrane is reduced, the lithium ion battery has high ion conductivity, the dynamic performanceof the lithium ion battery is greatly improved, and the provided lithium ion battery has the excellent rate capability and cycle performance.

Description

technical field [0001] The present application relates to the field of energy storage devices, and more particularly, to porous membranes and lithium ion batteries. Background technique [0002] Non-aqueous secondary batteries, especially lithium-ion batteries, are widely used in portable electronic devices such as notebook computers, digital cameras, video cameras, and mobile phones due to their high energy density and good rate performance. In recent years, lithium-ion batteries, as the power supply of new energy vehicles, are also promoting the development of lithium-ion battery technology. During the cycle of lithium-ion batteries, as the charge and discharge progress, a gap will be formed between the electrodes and the separator, resulting in a decrease in the cycle capacity of the lithium-ion battery, thereby affecting its service life. Therefore, there is an urgent need for a technical solution to solve the gap problem between the separator and the electrode to impro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/403H01M50/417H01M50/426H01M50/431H01M50/443H01M50/491
CPCH01M50/44H01M50/431H01M50/443H01M50/491H01M50/426H01M50/417H01M50/403H01M10/0525Y02E60/10H01M50/446H01M4/623H01M2004/028H01M4/583H01M4/661H01M2004/027H01M50/409
Inventor 易建建张新枝魏增斌陶兴华
Owner NINGDE AMPEREX TECH
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