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Coating liquid for lithium ion battery, lithium ion battery diaphragm and lithium ion battery

A lithium-ion battery and coating solution technology, applied in nanotechnology for materials and surface science, secondary batteries, battery pack components, etc., can solve the problem of poor wettability, poor thermal stability, and poor puncture resistance of the electrolyte and other problems, to achieve the effect of good puncture resistance and electrolyte wettability, and small increase in thickness and weight

Pending Publication Date: 2022-04-15
SHENZHEN SENIOR TECH MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of this, a kind of coating solution for lithium ion battery, lithium ion battery diaphragm and lithium ion battery provided by the present invention better overcome the problems and defects in the above-mentioned prior art. The present invention will use nanowire , ceramic powder, adhesive, etc. to obtain a coating liquid coated on the surface of the diaphragm body, and solidified, to obtain a lithium-ion battery separator composed of a diaphragm body and a coating loaded on the diaphragm body, the lithium-ion battery The separator has good thermal stability, puncture resistance, electrolyte wettability and mechanical strength, etc., which effectively solves the problems of poor thermal stability, poor puncture resistance and electrolyte wettability of existing separators

Method used

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  • Coating liquid for lithium ion battery, lithium ion battery diaphragm and lithium ion battery
  • Coating liquid for lithium ion battery, lithium ion battery diaphragm and lithium ion battery

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preparation example Construction

[0040] The present invention also provides a method for preparing a coating liquid, the coating liquid is the above-mentioned coating liquid, and the preparation method comprises: uniformly mixing various raw materials.

[0041] Preferably, the preparation method includes: firstly dispersing the long nanowires and short nanowires in a solvent, stirring or ultrasonically mixing, then adding an adhesive, continuing stirring or ultrasonically mixing to obtain a coating liquid. Further, it is also possible to continue adding additives after adding the adhesive.

[0042] The present invention also provides a lithium-ion battery diaphragm, comprising a diaphragm body and a coating supported on the diaphragm body, the coating is coated on at least one side of the diaphragm body with the above-mentioned coating solution, Cured to get.

[0043] Preferably, the coating method can be dip coating, spray coating, spin coating, roller coating or blade coating. The curing method may adopt ...

Embodiment 1

[0053] (1) Take 27 parts of ceramic powder and 30 parts of nanowires and disperse them in 100 parts of ethanol, stir and mix evenly, then add 50 parts of styrene-butadiene rubber to the mixed solution, continue to stir and mix evenly, and obtain a coating solution; It is a carbon nanotube with a diameter of 1-100 nm and a length of 0.1-100 μm, and the ceramic powder is an attapulgite rod with a particle diameter of 100 nm.

[0054] (2) Apply the coating solution prepared in step (1) evenly to one side surface of the polyethylene microporous membrane by spraying, then solidify at 70°C for 50s; then cool to room temperature to obtain polyethylene A lithium-ion battery diaphragm composed of a microporous membrane and a coating loaded on the surface of the polyethylene microporous membrane, wherein the thickness of the polyethylene microporous membrane is 20 μm, and the thickness of the coating is 0.05 μm.

Embodiment 2

[0056] (1) Take 7.5 parts of ceramic powder and 15 parts of nanowires and disperse them in 100 parts of ethanol, stir and mix evenly, then add 25 parts of polyvinyl alcohol to the mixed solution, continue to stir and mix evenly, and obtain a coating solution; wherein the nanowires It is nano-cellulose with a diameter of 1-100 nm and a length of 0.1-100 μm, and the ceramic powder is alumina with a particle size of 500 nm.

[0057] (2) Apply the coating solution prepared in step (1) evenly to one side surface of the polyethylene microporous membrane by spraying, then solidify at 40°C for 120s; then cool to room temperature to obtain polyethylene A lithium-ion battery separator composed of a microporous membrane and a coating loaded on the surface of the polyethylene microporous membrane; wherein, the thickness of the polyethylene microporous membrane is 10 μm, and the thickness of the coating is 0.3 μm.

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Abstract

The invention discloses coating liquid of a lithium ion battery diaphragm, the lithium ion battery diaphragm and a lithium ion battery. The coating liquid is prepared from the following raw materials: nanowires, ceramic powder, an adhesive and a solvent, the nanowires are at least one of nanocellulose, carbon nanotubes, silver nanowires, boron carbide nanowires, copper hydroxide nanowires, aramid nanofibers, silicon monoxide nanowires and hydroxyapatite nanowires; the diameter of the nanowire is 1 to 100 nm, and the length of the nanowire is 0.1 to 100 [mu] m; the ceramic powder is at least one of aluminum oxide, silicon oxide, titanium oxide, boehmite and attapulgite. The surface of the diaphragm body is coated with the coating liquid obtained by mixing the nanowires, the ceramic powder, the adhesive and the like, the coating liquid is cured, the lithium ion battery diaphragm composed of the diaphragm body and the coating loaded on the diaphragm body is obtained, and the lithium ion battery diaphragm has good thermal stability, puncture resistance and the like.

Description

[0001] This application is a divisional application of the invention patent application with the application number 201811015292.0 submitted on August 31, 2018, entitled "Coating solution for lithium ion battery, lithium ion battery separator and lithium ion battery". technical field [0002] The invention relates to the technical field of lithium ion batteries, in particular to a coating solution for lithium ion batteries, a lithium ion battery diaphragm and a lithium ion battery. Background technique [0003] Due to the advantages of large specific energy, high working voltage, long cycle life, no memory effect, small self-discharge, no pollution, green environmental protection, and long cycle life, lithium-ion batteries have been widely used in portable mobile electronic devices such as mobile phones and cameras. , notebook computers, etc., are also listed as candidate power sources for electric vehicles, aerospace, military and large energy storage equipment. With the de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/446H01M50/449H01M50/44H01M50/434H01M50/403H01M10/0525H01M10/42B82Y30/00H01M50/443H01M50/489
CPCH01M10/0525H01M10/4235B82Y30/00H01M50/446H01M50/403H01M50/449Y02E60/10
Inventor 王艳杰伍志杰谭斌陈莉
Owner SHENZHEN SENIOR TECH MATERIAL