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Preparation method of oxygen-absorbing diaphragm for high-safety lithium ion battery

A lithium-ion battery, high-safety technology, applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve problems such as thermal runaway of batteries, achieve the effect of improving safety and electrical performance, and avoiding thermal runaway

Pending Publication Date: 2022-05-10
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the cell is placed in a high-temperature environment, the inside of the cell will continue to be heated, and the cell will eventually experience thermal runaway.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for preparing an oxygen-absorbing diaphragm for a high-safety lithium-ion battery, in which an enzyme-based deoxidizer is coated on both sides of the outer surface of the diaphragm, the diaphragm is a functional film with a microporous structure, the thickness is 21 μm, the porosity is 60%, and it is breathable The density is 150s / 100mL, the tensile strength is 300MPa, and the puncture strength is 600Mpa;

[0021] The diaphragm is coated with boehmite on both sides of the base film, the base film is a single-layer polyolefin film PE, the thickness of the base film is 9 μm, and the total coating thickness of boehmite is 4 μm, that is, the single-layer coating thickness is 2 μm ;

[0022] The enzyme-based deoxidizer is glucose oxidized alcohol. First, a certain mass of glucose oxidized alcohol is dissolved in a certain mass of polyvinylidene fluoride (PVDF) binder under the action of centrifugal force, that is, the glucose oxidized alcohol is completely dissolved...

Embodiment 2

[0026] A preparation method of an oxygen-absorbing diaphragm for a high-safety lithium-ion battery. The outer surface of the diaphragm is double-coated with activated carbon additives. The diaphragm is a functional film with a microporous structure, with a thickness of 20 μm, a porosity of 60%, and an air permeability of 150 s / 100mL, tensile strength 300MPa, puncture strength 600MPa;

[0027] The diaphragm is coated with an alumina inorganic layer on one side of the base film, the base film is a composite film of polyethylene and polypropylene (PP / PE / PP), the thickness of the base film is 10 μm, and the coating thickness of the alumina inorganic layer is 3 μm;

[0028] The oxygen-absorbing additive is an activated carbon additive. First, a certain mass of activated carbon additive is dissolved in a certain mass of PVDF binder under the action of high-speed centrifugal force to form an activated carbon solution, so that the mass percentage of the activated carbon additive is 15...

Embodiment 3

[0032] A method for preparing an oxygen-absorbing diaphragm for a high-safety lithium-ion battery, in which carbon black additives are coated on both sides of the outer surface of the diaphragm, the diaphragm is a functional film with a microporous structure, the thickness is 18 μm, the porosity is 60%, and it is breathable The density is 100s / 100mL, the tensile strength is 300MPa, and the puncture strength is 700MPa;

[0033] The diaphragm is coated with boehmite on both sides of the base film, the base film is a polyolefin film, the thickness of the base film is 8 μm, and the total coating thickness of boehmite is 4 μm;

[0034] The oxygen-absorbing additive is a carbon black additive. First, a certain quality of the carbon black additive is dissolved in a certain quality of PVDF binder under high-speed centrifugal force to form a carbon black solution. The mass percentage of the carbon black additive is 15%, and then the carbon black The solution is dispersed into uniform a...

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Abstract

The invention discloses a preparation method of an oxygen-absorbing diaphragm for a high-safety lithium ion battery, which is characterized in that the outer surface of the diaphragm is coated with an oxygen-absorbing additive in a spraying or roller coating manner, and the diaphragm is a functional film with a microporous structure. The diaphragm provided by the invention has certain aperture and porosity, and can ensure smooth shuttling of ions in the charging and discharging process of the lithium ion battery. When the positive electrode material is decomposed at a high temperature to release oxygen, the functional diaphragm coated with the oxygen absorption additive prepared by the invention can quickly capture and absorb oxygen in the battery cell and prevent the oxygen from reacting with electrolyte, the negative electrode material and the like in a high-temperature environment to cause fire, so that thermal runaway of the battery cell can be avoided, and the safety performance and the electrical performance of the battery cell are improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery diaphragms, in particular to a method for preparing an oxygen-absorbing diaphragm for high-safety lithium-ion batteries. Background technique [0002] With the development of the world's electrification revolution, all walks of life, such as mobile electronics, transportation and energy storage, have undergone earth-shaking changes. Among them, lithium-ion battery has become the most widely used electrochemical power source at present, because of its remarkable advantages such as high specific energy and long cycle life, it is a clean and efficient battery with great development prospects. At the same time, with the rapid development of electric vehicles and emerging electronic products, the market demand for high-energy-density lithium-ion batteries is increasing. At present, the main route to increase energy density is through high-nickel, high-voltage cathode materials, etc. While ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403H01M50/446H01M50/449H01M10/0525
CPCH01M50/403H01M50/446H01M50/449H01M10/0525
Inventor 王振昆蒋亚清王光俊汪亚军
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY