Coating liquid for lithium-ion battery separator, lithium-ion battery separator and lithium-ion battery

A lithium-ion battery and coating liquid technology, which is applied in the direction of secondary batteries, battery pack parts, circuits, etc., can solve the problems of poor thermal stability and electrolyte wettability, and achieve good thermal stability and electrolyte wettability, Effect of small thickness and weight increase, good thermal stability

Active Publication Date: 2018-11-13
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 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 long nano Wires, short nanowires, and adhesives are mixed to obtain a coating liquid that is coated on the surface of the separator body and cured to obtain a lithium-ion battery separator composed of the separator body and the coating loaded on the separator body. The ion battery separator has good thermal stability, electrolyte wettability and mechanical strength, etc., which effectively solves the problems of existing separators with poor thermal stability and electrolyte wettability

Method used

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  • Coating liquid for lithium-ion battery separator, lithium-ion battery separator 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 9 parts of long nanowires and 10 parts of short nanowires and disperse them in 38 parts of ethanol, stir and mix evenly, then add 19 parts of polyvinyl alcohol to the mixed solution, continue to stir and mix evenly to obtain a coating solution; Long nanowires are carbon nanotubes with an aspect ratio greater than or equal to 500 and less than or equal to 10000 and a diameter of 1 to 100 nm, and short nanowires are nano attapulgite with an aspect ratio greater than or equal to 100 and less than 500 and a diameter of 1 to 1000 nm .

[0054] (2) Apply the coating solution prepared in step (1) evenly on one side surface of polyethylene microporous membrane by spraying, then solidify at 100°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...

Embodiment 2

[0056] (1) Take 5 parts of long nanowires and 10 parts of short nanowires and disperse them in 75 parts of ethanol, stir and mix evenly, then add 22.5 parts of polyvinyl alcohol to the mixed solution, continue to stir and mix evenly to obtain a coating solution; Long nanowires are silver nanowires with an aspect ratio greater than or equal to 500 and less than or equal to 10,000 and a diameter of 1 to 100 nm, and short nanowires are nanocellulose with an aspect ratio greater than or equal to 100 and less than 500 and a diameter of 1 to 1000 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 70°C for 50s; 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 1...

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Abstract

The invention discloses a coating liquid for a lithium-ion battery separator, a lithium-ion battery separator and a lithium-ion battery. The coating liquid includes the following raw materials: a longnanowire, a short nanowire, an adhesive and a solvent. The draw ratio of the long nanowire is not smaller than 500 and not bigger than 10000, the diameter of the long nanowire is 1-100 nm; the draw ratio of the short nanowire is not smaller than 10 and not bigger than 500, and the diameter of the short nanowire is 1-1000 nm. According to the invention, the coating liquid obtained through mixing the long nanowire, the short nanowire and the adhesive is coated on the surface of the separator body, and is then cured, so that the lithium-ion battery separator consisting of the separator body andthe coating loaded on the separator body is obtained; the lithium-ion battery separator has good thermal stability, electrolyte wettability and mechanical strength, and the like.

Description

technical field [0001] 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 [0002] 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 development of lithium-ion batteries, the requirements for battery capacity, high and low temperature resistance and cycle life are getting higher and higher. Lithium-ion batteries are currently a widely used secondary battery. [0003] Lithium-ion batteries are mainly co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/0525
CPCH01M10/0525H01M50/411H01M50/431H01M50/44H01M50/449Y02E60/10
Inventor 王艳杰伍志杰
Owner SHENZHEN SENIOR TECH MATERIAL
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