Ceramic microsphere, diaphragm containing ceramic microsphere and lithium ion battery containing diaphragm

A technology of ceramic microspheres and microspheres, which is applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve the problems of limited application, small voltage sensitive range, high cost, etc., and achieve the effect of improving safety performance and reducing processing costs

Active Publication Date: 2021-03-19
ZHUHAI COSMX BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to improve the safety performance of the lithium-ion battery diaphragm, a voltage-sensitive diaphragm is disclosed in the literature. Microcrystalline graphite is added to a chloroform solution containing poly(3-decyl-thiophene), and the mechanical ball mill is homogenized to obtain a modified diaphragm. After drying, a voltage-sensitive diaphragm is obtained. The diaphragm has a reversible overcharge protection function, especially for lithium iron phosphate batteries. However, the diaphragm has a large degree of self-discharge and The voltage sensitive range is small, which limits its application in high energy density power batteries
There is also a document that discloses a diaphragm with heat sealing and excellent air permeability, which uses electrospinning technology to spin heat-sensitive materials on the base film, and obtains a safety diaphragm for secondary batteries after drying, but this document The use of electrospinning technology in the process has disadvantages such as high cost and difficulty in industrialization, which limit its application.

Method used

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  • Ceramic microsphere, diaphragm containing ceramic microsphere and lithium ion battery containing diaphragm
  • Ceramic microsphere, diaphragm containing ceramic microsphere and lithium ion battery containing diaphragm
  • Ceramic microsphere, diaphragm containing ceramic microsphere and lithium ion battery containing diaphragm

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preparation example Construction

[0041] [Preparation method of ceramic microspheres]

[0042] As mentioned above, the present invention also provides a method for preparing the above-mentioned ceramic microspheres, the method comprising the following steps:

[0043] Using a liquid-phase coating method or a solid-phase coating method, coating a shell-forming material including a thermosensitive polymer and a conductive agent on the surface of a core-forming material including a ceramic material to prepare the ceramic microspheres; Wherein, the ceramic microsphere has a core-shell structure, that is, includes a shell layer and a core, the material forming the shell layer includes a thermosensitive polymer and a conductive agent, and the material forming the core core includes a ceramic material.

[0044] Exemplarily, in the case of using a liquid-phase coating method, the liquid-phase coating method includes the following steps:

[0045] The material forming the shell layer is dissolved in a solvent by stirrin...

Embodiment 1

[0103] 0.5g polyethylene terephthalate is dissolved in cresol by stirring mode, forms mixed solution, adds 50g to dope 20wt.% perfluoromethanesulfonic acid (CF 3 SO 3 H) Pyrolyzed polyvinyl alcohol, after stirring and mixing uniformly, the solvent in the mixture is removed by spray drying technology to obtain microspheres coated with conductive materials by thermosensitive polymers.

[0104] In the prepared conductive microspheres, the shell layer is polyethylene terephthalate, and the core is doped with 20wt.% perfluoromethanesulfonic acid (CF 3 SO 3 H) pyrolyzed polyvinyl alcohol; the mass ratio of the shell to the core is 0.5:50, the thickness of the shell is 1 nm, and the average particle size of the microspheres is about 0.01 μm.

[0105] Dissolve 0.2g polyethylene terephthalate and conductive carbon black (the mass ratio of thermosensitive polymer: conductive carbon black=100:1) in cresol by stirring to form a mixed solution, add 50g Boehm After stirring and mixing un...

Embodiment 2

[0110] 200g polystyrene was dissolved in benzene by stirring to form a mixed solution, and 60g doped with 30wt% tungsten hexafluoride (WF 6 ) of polyacetylene, after stirring and mixing evenly, the solvent in the mixture is removed by spray drying technology to obtain microspheres of thermosensitive polymer-coated conductive materials.

[0111] In the prepared conductive microspheres, the shell is polystyrene, and the core is doped with 30wt% tungsten hexafluoride (WF 6 ) of polyacetylene; the mass ratio of the shell to the core is 200:60, the thickness of the shell is 400nm, and the average particle diameter of the microspheres is about 10 μm.

[0112] 0.32g polystyrene and conductive agent Ketjen black (wherein thermosensitive polymer: the mass ratio of conductive agent Ketjen black=1000:1) are dissolved in benzene by stirring mode, form mixed solution, add 80g zirconium dioxide, After stirring and mixing evenly, the solvent in the mixture is removed by spray drying technol...

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Abstract

The invention provides a ceramic microsphere, a diaphragm containing the ceramic microsphere and a lithium ion battery containing the diaphragm. Different from a conventional diaphragm of a lithium ion battery, the diaphragm disclosed by the invention is mainly characterized in that two high-safety coated microspheres, namely conductive microspheres and ceramic microspheres, of thermosensitive blocking lithium ions and thermosensitive conduction electrons are prepared by adopting a polymer coating method, and the two high-safety coated microspheres are applied to the diaphragm of the lithium ion battery. The diaphragm of the lithium ion battery has two functions, namely a thermosensitive lithium ion blocking function and a thermosensitive conduction function, and the safety performance ofthe lithium ion battery can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of microspheres and lithium ion batteries, and in particular relates to a ceramic microsphere, a diaphragm containing the ceramic microsphere and a lithium ion battery containing the diaphragm with high safety. Background technique [0002] Compared with traditional secondary batteries, lithium-ion batteries have the advantages of high energy density, environmental protection, and long service life. At present, they have been widely used in the field of power batteries, digital products, and energy storage. Lithium-ion batteries are mainly composed of positive electrode materials, negative electrode materials, separators, and electrolytes. Due to the material system and structural characteristics of lithium-ion batteries, lithium-ion batteries may cause the temperature of the battery to rise during actual use. It will accelerate the exothermic reaction rate in lithium-ion batteries, which will lead to therma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/434H01M50/443H01M50/449H01M50/403H01M10/0525
CPCH01M10/0525H01M50/434H01M50/403H01M50/443Y02E60/10H01M50/414H01M50/446
Inventor 李素丽唐伟超张祖来赵伟李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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