Preparation method of composite diaphragm, composite diaphragm and lithium ion battery
A composite diaphragm and base film technology, which is applied in the field of lithium-ion batteries, can solve the problems of poor bonding effect, no pole piece bonding effect, and no diaphragm sticking, etc., and achieve the effect of improving the bonding effect
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Example Embodiment
[0032] A method for preparing a composite diaphragm includes the following operations:
[0033] Placing the inorganic particles 2 in the first solvent to obtain an inorganic slurry, coating the inorganic slurry on at least one surface of the base film 1 at intervals, and drying to obtain an inorganic thermally stable coating;
[0034] The organic particles 3 are dissolved in the second solvent to obtain an organic slurry, and the organic slurry is intermittently coated on the surface of the base film 1 between the inorganic thermally stable coatings to obtain an organic bonding coating; wherein, the organic bonding The thickness of the coating is greater than that of the inorganic thermally stable coating, and a composite diaphragm is obtained after drying.
Example Embodiment
[0035] Example 1
[0036] This embodiment provides a lithium ion battery, the preparation method of which is as follows:
[0037] (1) Preparation of composite diaphragm:
[0038] Take polyethylene microporous film with a thickness of 16um as the base film;
[0039] Preparation of inorganic thermally stable coating: adding Al in deionized water 2 O 3 Particle (Al 2 O 3 The average particle size of the particles is 1 μm) after stirring for 2 hours, grinding in a ball mill for 1 hour, and adding sodium carboxymethyl cellulose (CMC) to the ground slurry and stirring for 1 hour to prepare an inorganic slurry. The gravure coating method is used to coat the two sides of the base film with inorganic slurry so that the Al 2 O 3 The particles are arranged in island-like intervals on the surface of the base film to obtain an inorganic thermally stable coating with a thickness of 5 μm, which is ready for use after drying;
[0040] Preparation of organic bonding coating: Add polyvinylidene fluoride...
Example Embodiment
[0045] Example 2
[0046] This embodiment provides a lithium ion battery. The difference from Embodiment 1 is the preparation of the composite diaphragm:
[0047] Take a glass fiber membrane with a thickness of 16um, synthesize a polyamic acid solution and dissolve it in DMAc, then apply the mixed solution to the glass fiber membrane, first heat up to 60°C for 30 minutes; then heat up to 120°C for 30 minutes; then heat up Keep it at 200°C for 60 minutes, dry to remove excess solvent, vacuum dry to complete the imidization reaction, and obtain a polyimide-glass fiber composite film as the base film;
[0048] Preparation of inorganic thermally stable coating: adding Al in deionized water 2 O 3 Particle (Al 2 O 3 The average particle size of the particles is 1 μm) after stirring for 2 hours, grinding in a ball mill for 1 hour, and adding sodium carboxymethyl cellulose (CMC) to the ground slurry and stirring for 1 hour to prepare an inorganic slurry. The gravure coating method is used t...
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