Composite ceramic coated fiber diaphragm, preparation method thereof and lithium battery

A composite ceramic and coating technology, which is applied to battery components, separators/films/diaphragms/spacers, circuits, etc., can solve the problems of low melting point of the separator, battery failure, explosion, etc., and improve the liquid retention capacity , low self-discharge, and improved cycle life

Pending Publication Date: 2022-04-22
FULLYMAX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] With the extensive use of new energy vehicles, high-rate, high-capacity batteries have been developed one after another. The traditional diaphragm has a low melting point, and its thermal shrinkage will lead to battery failure, fire and explosion. This undoubtedly poses a challenge to the safety performance of lithium-ion batteries. great challenge

Method used

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  • Composite ceramic coated fiber diaphragm, preparation method thereof and lithium battery
  • Composite ceramic coated fiber diaphragm, preparation method thereof and lithium battery
  • Composite ceramic coated fiber diaphragm, preparation method thereof and lithium battery

Examples

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preparation example Construction

[0031] The application provides a method for preparing a composite ceramic coated fiber diaphragm. The preparation method of the above-mentioned composite ceramic coated fiber membrane comprises the following steps: preparing an electrospinning solution; performing a porous membrane electrospinning operation on the electrospinning solution on a cellulose membrane to obtain a precursor film; preparing a nano-ceramic coating Slurry: coating the nano-ceramic coating slurry on both sides of the precursor film respectively to obtain the composite ceramic-coated cellulose diaphragm.

[0032] In the preparation method of the above-mentioned composite ceramic coated fiber diaphragm, by preparing the electrospinning liquid, then performing the electrospinning operation of the porous membrane on the electrospinning liquid on the cellulose membrane, the cellulose film is used as the base film of the composite diaphragm, which can The composite diaphragm has good stability, and the cellul...

Embodiment 1

[0063] The membrane component materials in preset proportions are sequentially added into the organic solvent, and stirred and mixed to obtain an electrospinning solution. Then, the electrospinning liquid was electrospun on the cellulose membrane to form a porous membrane layer, wherein the thickness of the cellulose membrane was 5 μm, and the porosity was 40%. Weigh a preset amount of nano-ceramic component materials, dissolve them in deionized water, and perform a high-speed dispersion operation to obtain a uniform nano-ceramic coating slurry, wherein the nano-ceramic coating slurry includes 10 wt% of particles with a diameter of 0.1 μm Aluminum oxide, 0.5wt% binder, 0.1wt% stabilizer and 0.2wt% surfactant. The nano-ceramic coating slurry is coated on both sides of the precursor film respectively to obtain a composite ceramic-coated cellulose diaphragm.

Embodiment 2

[0065] The membrane component materials in preset proportions are sequentially added into the organic solvent, and stirred and mixed to obtain an electrospinning solution. Then, the electrospinning liquid is subjected to electrospinning operation of the porous membrane on the cellulose membrane to form a porous membrane layer, wherein the thickness of the cellulose membrane is 20 μm, and the porosity is 90%. Weigh a preset amount of nano-ceramic component materials, dissolve them in deionized water, and perform a high-speed dispersion operation to obtain a uniform nano-ceramic coating slurry, wherein the nano-ceramic coating slurry includes 30 wt% of oxide particles with a diameter of 5 μm Aluminum, 10wt% binder, 2wt% stabilizer and 1wt% surfactant. The nano-ceramic coating slurry is coated on both sides of the precursor film respectively to obtain a composite ceramic-coated cellulose diaphragm.

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Abstract

The invention provides a composite ceramic coated fiber diaphragm, a preparation method thereof and a lithium battery. The preparation method of the composite ceramic coated fiber diaphragm comprises the following steps: preparing an electrostatic spinning solution; performing porous membrane electrostatic spinning operation on the electrostatic spinning solution on a cellulose membrane to obtain a precursor membrane; preparing nano ceramic coating slurry; and respectively coating two surfaces of the precursor membrane with the nano ceramic coating slurry to obtain the composite ceramic coated cellulose diaphragm. The composite diaphragm prepared by the preparation method of the composite ceramic coated fiber diaphragm has the advantages of relatively high thermal stability and relatively high safety.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a composite ceramic coated fiber diaphragm, a preparation method thereof, and a lithium battery. Background technique [0002] Lithium-ion battery is a kind of secondary battery, which is widely used because of its long life, high energy density, and fast charging speed. The separator is one of the key inner components of lithium-ion batteries. At present, polyolefin microporous film materials are widely used as the separator of lithium-ion batteries. The separator has a crucial influence on the actual performance of the battery. It must have good chemical and electrochemical stability, and can provide lithium ions in the positive state. The channel through which the negative electrodes penetrate and circulate has good electrolyte absorption and liquid retention capabilities, and has a certain tensile strength and puncture resistance to prevent lithium-ion batteries...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/40H01M50/403H01M50/44
CPCH01M50/40H01M50/403H01M50/44
Inventor 方应国刘长昊李雪峰
Owner FULLYMAX BATTERY CO LTD
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