Lithium ion battery, coating separator and preparation method thereof

A coating and diaphragm technology, applied in the field of new energy, can solve problems such as battery deformation, battery efficiency reduction, safety hazards, etc., and achieve the effects of reducing the probability of short circuit, enhancing hardness, and good adhesion

Active Publication Date: 2019-01-04
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to provide a lithium-ion battery, a coated diaphragm and a preparation method thereof, aiming at solving the local deformation of the battery caused by the local extrusion between the cell pole piece and the diaphragm in the prior art, and the resulting damage to the battery Reduced efficiency and potential safety hazards

Method used

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  • Lithium ion battery, coating separator and preparation method thereof
  • Lithium ion battery, coating separator and preparation method thereof
  • Lithium ion battery, coating separator and preparation method thereof

Examples

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preparation example Construction

[0063] The present invention also proposes a preparation method for preparing a coating diaphragm, comprising the following steps:

[0064] S1. Mix the inorganic compound particles, the surfactant, the first polymer binder and the deionized water uniformly according to the first mass ratio to obtain the first coating slurry.

[0065] The inorganic compound particles are ceramic particles, including one or more of aluminum oxide, silicon dioxide, magnesium hydroxide, boehmite, zirconium dioxide, calcium oxide, and zinc oxide, wherein the average particle size of the inorganic compound particles The diameter ranges from 0.1 μm to 4 μm; the surfactant includes one or more of alkylphenol polyoxyethylene ether, fatty alcohol polyoxyethylene ether, fatty acid polyoxyethylene ether, fatty amine polyoxyethylene ether; the first polymerization The polymer binder includes one or more of styrene-butadiene rubber, polyacrylonitrile, polyacrylic acid, and methyl methacrylate, wherein the a...

Embodiment 1

[0077] refer to figure 1 , is a schematic diagram of the structure of the coating diaphragm in Example 1 of the present invention. The diaphragm base material 10 selects a polyethylene porous film layer with a thickness of 12 μm; the upper surface of the diaphragm base material 10 is coated with a first coating 101 with a thickness of 3 μm; the first The upper surface of the coating 101 is coated with a second coating 102 . The inorganic compound particles of the first coating 101 use boehmite with an average particle size of 2 μm, the first polymer binder uses styrene-butadiene rubber with an average particle size of 0.5 μm, and the surfactant uses alkylphenol polyoxyethylene ether The organic compound particles of the second coating 102 are vinylidene fluoride-hexachloropropylene polymer with an average particle size of 5 μm, and the second polymer binder is styrene-butadiene rubber with an average particle size of 0.5 μm.

[0078] The preparation process of the embodiment ...

Embodiment 2

[0093] The structure of the coating membrane in Example 2 of the present invention is the same as that in Example 1.

[0094] The raw material is different from that of Example 1 in that the inorganic compound particles of the first coating 101 are aluminum oxide with an average particle size of 4 μm, the first polymer binder is polyacrylonitrile with an average particle size of 1 μm, and the surfactant Fatty alcohol polyoxyethylene ether is used; the organic compound particles of the second coating 102 are polyvinylidene fluoride with an average particle size of 5 μm, and the second polymer binder is polyacrylic acid with an average particle size of 1 μm.

[0095] The preparation method is different from that of Example 1 in that: the solid content of the second coating slurry is 13%, and the viscosity is 150 mPa·s. Adjust the flow rate of the pressure pump to deliver the second coating slurry to be 0.6L / min, and the rotation speed of the dispersion disc is 7000r / min, and the...

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Abstract

The invention discloses a lithium ion battery, a coating separator and a preparation method thereof, comprising: a separator base material, wherein the separator base material is a porous polymer filmlayer; A first coating uniformly and continuously formed on at least one surface of the diaphragm substrate; A second coating layer dispersed at a predetermined pitch on the surface of the first coating layer or the surface of the diaphragm substrate by a conical deposit having a preset stacking shape. The first coating and the second coating of the coating diaphragm of the invention increase thebarrier action of the diaphragm between the positive electrode and the negative electrode, and reduce the probability of short circuit in the positive electrode and the negative electrode. The firstcoating also has good thermal stability to the diaphragm substrate. The second coating is sprayed by atomization, the cone-shaped deposit has little effect on the permeability of the membrane, and thegap provides a better channel for the flow and infiltration of the electrolyte. The second coating also possesses cold / hot pressing irreversible deformation and good adhesion, which reduces the riskof cell deformation and improves the electrochemical performance of the battery.

Description

technical field [0001] The invention relates to the technical field of new energy, in particular to a lithium ion battery, a coated diaphragm and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in the fields of consumer electronics and electric vehicles, and as consumers gradually increase their requirements for the battery life of electronic products, the requirements for battery capacity and performance are getting higher and higher at this stage. The greater the thickness, length, width and other volumetric requirements of a single battery, the tighter and tighter the compression between the positive and negative electrodes and the separator will be, so the requirements for the battery manufacturing process are getting higher and higher. At present, in order to improve the efficiency of battery production, battery manufacturers use fully automatic high-speed winding machines to manufacture battery cores. Due to the h...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14H01M10/0525H01M50/403H01M50/446H01M50/457H01M50/489
CPCH01M10/0525H01M50/446H01M50/403H01M50/411Y02E60/10
Inventor 程忠张耀林峰陈辉
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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