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
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[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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