Low-temperature-resistant nano-cellulose coated diaphragm, preparation method and low-temperature-resistant secondary battery

[0014] In order to improve the low temperature resistance of the secondary battery, the present invention provides a method of preparing a low temperature nanochemical coating membrane, comprising the step of preparing a nanocellulose slurry, i.e., adding nanocarns to a dispersant solution. After stirring, the thickener, binder, wetting agent is sequentially added, and stirring is continued; the nanochemical coating diaphragm is prepared, and the obtained nanochemially slurry is applied to the surface of the porous separator, and Drying; preparing low-temperature nanocolymetate coating diaphragms, i.e., a corona treatment of the drying nanoculine coating diaphragm, after coating the surface of the diary, after the surface of the diaphragm is sprayed, Carry the winding.

[0015] Specifically, the nanochemical is prepared to a nanochemical slurry, and the porous isolation film is applied, and the nanochemical coating diaphragm is produced; the nanochemical coating diaphragm is dried, a

[0038] Example 1

[0039] The cellulose microfiber with a 40 kg of length of 300 nm was added to a 0.6 kg solid content of 40% sodium dodecyl benzene sulfonate solution, and stirred dispersion, and the cellulose microfiber solution was prepared;

[0040] Add a 9.6 kg of a solid content of 5% a sodium carboxymethylcellulose solution of 5%, 6 kg solid content of 30%, and 0.6 kg of fatty alcohol polyoxyethylene ether. Stirring dispersion, produce nanochemical slurry;

[0041] Two surfaces of the PE porous film having a thickness of 4 μm were coated with a nancellulose slurry, and each coating had a thickness of 3 μm, and dried to prepare nanocarbon coating diaphragms;

[0042] The cryogenic treatment of the drying nanoculin was coated with a film, and the surface spraying of the isolated membrane was applied to the surface of the isolated membrane, and the drying and retracted, and the low temperature nanocolysulose coating was produced. Diaphragm.

[0043] Example 2

[0044]The cellulose microfiber of 40 kg of 350 nm was added to a 0.3 kg solid content of 40% sodium dodecyl benzene sulfonate solution, and stirred dispersion, and the cellulose microfiber solution was produced.

[0045] To the dispersed cellulose microfil solution, a 24 kg solid content of 5% sodium carboxymethylcellulose solution is sequentially added, and 10 kg solid content is 30% acrylate adhesive, 0.16 kg of fatty alcohol polyoxyethylene ether, and carried out Stir disperse,;

[0046] Two surfaces of the PE porous membrane having a thickness of 0.6 μm were coated with nanochemical slurry, and each coating had a thickness of 0.2 μm and dried to prepare a nanocolysulin coating diaphragm;

[0047] The cryogenic treatment of the drying nanoculin was coated with a film, and the surface spraying of the isolated membrane was applied to the surface of the isolated membrane, and the drying and retracted, and the low temperature nanocolysulose coating was produced. Dia