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Metal compound diaphragm as well as preparation method and application thereof

A metal compound and diaphragm technology, applied in the field of metal compound diaphragm and its preparation, can solve the problems of not being able to fundamentally inhibit the growth of lithium dendrites, failing to reduce battery performance attenuation, and being punctured, so as to avoid battery corrosion, Effect of improving electrochemical performance and increasing tortuosity

Active Publication Date: 2022-08-02
SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at best, this method only reduces the risk of internal short circuit caused by the diaphragm being punctured, and cannot fundamentally inhibit the growth of lithium dendrites. The degradation of battery performance caused by

Method used

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  • Metal compound diaphragm as well as preparation method and application thereof
  • Metal compound diaphragm as well as preparation method and application thereof
  • Metal compound diaphragm as well as preparation method and application thereof

Examples

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preparation example Construction

[0054] The preparation method of the metal compound separator according to the first embodiment of the present invention is further described below, which includes: a mixing step; and a drying coating step.

[0055] During mixing, the heat-resistant particles, metal oxide particles and solvent are mixed to obtain a dispersion. The use of a solvent can disperse the heat-resistant particles and the metal oxide particles so that they can subsequently be distributed in a desired manner on one side of the base film (1), an example of the solvent can be, but not limited to, N,N-dimethyl One or more of formamide, N-methylpyrrolidone, acetonitrile, ethanol, and isopropanol. Furthermore, in order to improve the adhesion of the coating (2), the dispersion liquid may further comprise a binder. Under this condition, the use of a solvent can dissolve the binder more.

[0056] During dry coating, the dispersion liquid is coated on one side of the base film (1) and dried to obtain a metal ...

Embodiment 1

[0073] In the separator of this embodiment, the thickness of the base film is 9 μm, and the thickness of the coating layer is 2 μm.

[0074] First, alumina heat-resistant particles with a particle size of 100 nm, manganese oxide metal oxide particles with a particle size of 50 nm, a PVDF binder and a solvent are mixed to obtain a dispersion. The solvent is N,N-dimethylformamide, N-methylformamide One or more of pyrrolidone, acetonitrile, ethanol, and isopropanol.

[0075] Next, the dispersion liquid was applied to one side of the polyethylene base film and then dried to obtain a separator.

Embodiment 2

[0077] In the separator of this embodiment, the thickness of the base film is 9 μm, and the thickness of the coating layer is 4 μm.

[0078]First, the alumina heat-resistant particles with a particle size of 100 nm, the PVDF binder and the solvent are mixed to obtain a first dispersion liquid, and the manganese oxide metal oxide particles with a particle size of 50 nm, the PVDF binder and the solvent are mixed to obtain a second dispersion liquid liquid. The solvent is one or more of N,N-dimethylformamide, N-methylpyrrolidone, acetonitrile, ethanol, and isopropanol.

[0079] Next, the first dispersion liquid is coated on one side of the polyethylene base film and then dried, and the second dispersion liquid is coated on the same side of the polyethylene base film and then dried to obtain a separator.

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Abstract

The present invention provides a metal compound separator including a base film and a coating layer formed on at least one side of the base film, the coating layer including at least heat resistant particles and metal oxide particles. The invention also provides a lithium battery which comprises the metal compound diaphragm, a positive electrode and a negative electrode, and the metal compound diaphragm is positioned between the positive electrode and the negative electrode. The invention also provides a preparation method of the metal compound diaphragm. The preparation method comprises the following steps: mixing materials: mixing the heat-resistant particles, the metal oxide particles and a solvent to obtain a dispersion liquid; and drying and coating: coating at least one side of a base membrane with the dispersion liquid, and drying to obtain the metal compound diaphragm.

Description

technical field [0001] The present invention relates to the technical field of lithium batteries, and in particular relates to a metal compound separator and a preparation method and application thereof. Background technique [0002] In recent years, with the great breakthrough in the technical level of lithium batteries, it has achieved rapid development and growth in many application fields, especially in the field of new energy vehicles. However, the formation of lithium dendrites during the use of commercial lithium batteries will bring about electrical performance degradation and safety hazards, and it is difficult to meet the needs of users for long cycles, fast charging, and use in supercooled and overheated environments. [0003] At present, in order to inhibit the growth of lithium dendrites and reduce the risk of internal short circuit in lithium batteries, improvements are mainly made in the aspects of battery separator coating, pole piece coating, high-safety ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/431H01M50/449H01M50/403H01M10/052
CPCH01M50/431H01M50/449H01M50/403H01M10/052Y02E60/10
Inventor 庄志郭宏伟鲍晋珍吴惠康蔡裕宏冶成良程跃
Owner SHANGHAI ENERGY NEW MATERIALS TECH CO LTD
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