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Lithium battery diaphragm ceramic coating slurry and ceramic coating diaphragm

A lithium battery separator, battery separator technology, applied in the direction of separator/film/diaphragm/spacer element, battery pack parts, circuit, etc. Problems such as poor wettability and ionic conductivity, to achieve the effect of improving wettability and ionic conductivity, as well as film surface flatness and density

Active Publication Date: 2021-10-22
CHONGQING YUNTIANHUA NEWMI-TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Ceramic-coated separators are currently the most widely used lithium battery separators. However, there are some problems with the existing ceramic separators on the market: the interface compatibility of ceramic separators with organic and inorganic materials is poor, which often leads to the wettability and ionization of ceramic separators. The electrical conductivity is poor, and it will also cause the membrane surface of the ceramic diaphragm to be uneven
In addition, if the ceramic layer is not dense enough, the heat resistance of the separator will not be improved significantly; if it is too dense, it will block the pores, making the battery cycle and rate performance worse.

Method used

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  • Lithium battery diaphragm ceramic coating slurry and ceramic coating diaphragm
  • Lithium battery diaphragm ceramic coating slurry and ceramic coating diaphragm
  • Lithium battery diaphragm ceramic coating slurry and ceramic coating diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Prepare ceramic powder slurry: disperse alumina ceramic powder in water, and add conventional dispersant, adhesive and wetting agent at the same time to obtain ceramic powder slurry.

[0029] (2) Preparation of lithium siloxane: dissolve lithium hydroxide powder in water, then add γ-methacryloxypropyltrimethoxysilane, and perform ultrasonic hydrolysis reaction for 24 hours under ice bath conditions to obtain silicon oxide Lithium alkylate, its synthesis process is as follows figure 1 shown.

[0030] (3) Prepare ceramic coating slurry: add the prepared lithium siloxane to the ceramic powder slurry, and add sericin, ethylene glycol bispropionitrile ether and FC-4430 fluorocarbon surfactant; In parts by weight, 25 parts of alumina ceramic powder, 1 part of lithium siloxane, 1 part of sericin, 1 part of ethylene glycol bispropionitrile ether, 0.03 part of FC-4430 fluorocarbon surfactant; stir and mix evenly , to obtain a ceramic coating slurry.

[0031] (4) Use 7μm p...

Embodiment 2

[0034] The difference between this example and Example 1 is that in the ceramic coating slurry, in parts by weight, there are 35 parts of silica ceramic powder, 2 parts of lithium siloxane, 2 parts of zein, melamine Formaldehyde resin 1.5 parts, FC-4430 fluorocarbon surfactant 0.05 parts.

Embodiment 3

[0036] The difference between this example and Example 1 is that in the ceramic coating slurry, in parts by weight, there are 40 parts of magnesium oxide ceramic powder, 3 parts of lithium siloxane, 3 parts of carboxymethyl cellulose, cyanide 2 parts of ethyl polyvinyl alcohol, 0.08 parts of FS-3100 fluorocarbon surfactant.

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Abstract

The invention discloses a lithium battery diaphragm ceramic coating slurry and a ceramic coating diaphragm; the ceramic coating slurry contains ceramic powder slurry obtained by dispersing ceramic powder in a solvent, and the ceramic coating slurry It also contains lithium siloxane, natural high molecular material, cyano polymer and surfactant; the lithium siloxane is an organic lithium salt formed by hydrolysis of silane coupling agent and lithium hydroxide. The invention improves the interfacial compatibility of the organic and inorganic materials of the ceramic diaphragm, and remarkably improves the wettability, ion conductivity and membrane surface smoothness of the ceramic diaphragm.

Description

technical field [0001] The invention belongs to the field of lithium battery diaphragm materials, and in particular relates to a ceramic coating slurry for a lithium battery diaphragm and a ceramic coating diaphragm. Background technique [0002] As a new type of secondary battery, lithium battery has the advantages of high energy density and long cycle life. Its application range continues to expand and is widely used in portable electronic devices, electric tools, energy storage and power vehicles. With the rapid development, lithium batteries are more and more used in power vehicles. However, frequent lithium battery safety accidents have aroused widespread concern. Among them, the separator, as an important part of the lithium battery, can effectively prevent the short circuit between the positive and negative electrodes, which has a very important impact on the safety of the lithium battery. Therefore, the performance improvement and safety requirements of the lithium ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/40H01M50/403H01M50/446
CPCH01M50/40H01M50/403H01M50/409H01M50/411H01M50/44Y02E60/10
Inventor 陶晶王志豪陈瀚
Owner CHONGQING YUNTIANHUA NEWMI-TECH CO LTD