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Composite ceramic particles as well as preparation method and application thereof

A technology of composite ceramics and ceramic particles, used in coatings, electrical components, electrochemical generators, etc., can solve the problems of inability to provide mechanical strength, melting collapse, powdering of external ceramic coatings, etc., to improve heat resistance. , Avoid excessive shrinkage, improve the effect of thermal stability

Active Publication Date: 2021-08-20
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the diaphragm with this structure still has the following deficiencies: 1) When the temperature exceeds the melting point of the polyolefin diaphragm, the porous structure polyolefin will melt and collapse, resulting in the pulverization of the external ceramic coating, which cannot provide effective support, and the diaphragm will shrink significantly , there is a risk of direct contact between the positive and negative electrodes; 2) Under high temperature conditions, the polyolefin-based film cannot provide any mechanical strength after melting, causing the separator to easily puncture and cause an internal short circuit

Method used

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  • Composite ceramic particles as well as preparation method and application thereof
  • Composite ceramic particles as well as preparation method and application thereof
  • Composite ceramic particles as well as preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0044] 2. A method for preparing composite ceramic particles, comprising the following steps:

[0045] mixing phase change particles 1 and ceramic particles 2, so that the phase change particles 1 are filled in the ceramic particles 2, and ceramic particles filled with phase change particles are obtained;

[0046] The ceramic particles filled with phase-change particles are mixed with the heated film-forming material 3, so that the heated film-forming material 3 is coated on the surface of the ceramic particles filled with phase-change particles; wherein, the heated The melting point of the film-forming material 3 is 80-150°C;

[0047] The preparation of composite ceramic particles is completed.

[0048] Further, when the phase-change particles 1 are mixed with the ceramic particles 2, the phase-change particles 1 should be ground into powder first, and the particle diameter of the phase-change particles 1 is smaller than the inner diameter of the ceramic particles 2, so as t...

Embodiment 1

[0069] A kind of composite ceramic particles, including phase change particles 1, ceramic particles 2 and heated film-forming material 3; wherein, the phase change particles 1 are used as the inner core of the composite ceramic particles; the ceramic particles 2 are used as the middle layer of the composite ceramic particles; the The ceramic particles 2 have a mesoporous hollow sphere structure, and the phase change particles 1 are filled in the ceramic particles 2; the heated film-forming material 3 is used as the shell of the composite ceramic particles, and is coated on the ceramic particles 2. Surface; the melting point of the heated film-forming material 3 is 80-150°C.

[0070] Specifically, copper sulfate pentahydrate is used as the phase change particles 1 , alumina with a mesoporous hollow sphere structure is used as the ceramic particles 2 , and polyethylene wax is used as the film-forming material 3 easily heated by heat.

[0071] The preparation method of the compos...

Embodiment 2

[0084] Different from Example 1, the phase change particle 1 of this example is potassium sulfate.

[0085] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention provides composite ceramic particles as well as a preparation method and application thereof. The composite ceramic particles comprise phase change particles, ceramic particles and a material easy to form a film after being heated, wherein the phase change particles are used as inner cores of the composite ceramic particles, the ceramic particles are used as middle layers of the composite ceramic particles, the ceramic particles are of mesoporous hollow sphere structures, the phase change particles fill in the ceramic particles, the material easy to form a film after being heated is used as shells of the composite ceramic particles and coats the surfaces of the ceramic particles; the melting point of the material easy to form the film after being heated is 80-150 DEG C. Compared with a conventional ceramic coating prepared from ceramic particles, a ceramic coating prepared from the ceramic particles with the three-layer core-shell structure has high heat resistance. Thus, with the structural design of the composite ceramic particles adopted, the problem that the existing ceramic coating is insufficient can be effectively solved.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a composite ceramic particle and a preparation method and application thereof. Background technique [0002] Due to its high specific energy, no memory effect and excellent cycle life, lithium-ion batteries are widely used in various electronic devices such as digital cameras, mobile phones, tablet computers, and drones, and are constantly being used in the field of new energy vehicles. Development is an important driving force for the development of electrochemical energy storage devices. [0003] In the structure of lithium ion battery, it includes positive electrode, negative electrode, electrolyte and diaphragm. The separator is located between the positive electrode and the negative electrode, and its main function is to separate the positive electrode and the negative electrode to prevent the migration of active materials; at the same time, it also has the function of prov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D5/32C09D7/65H01M50/443H01M50/449H01M50/489H01M10/0525
CPCC09D1/00C09D5/32C09D7/65H01M10/0525Y02E60/10
Inventor 官淑敏邓豪马斌陈杰杨山李载波
Owner HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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