CN-122011822-A - Coating composition and preparation method thereof, isolating film, electrode plate, battery monomer and battery device

Abstract

The application discloses a coating composition and a preparation method thereof, an isolating film, an electrode plate, a battery monomer and a battery device. The coating composition comprises inorganic particle powder, wherein the inorganic particle powder is spherical primary particles and is dispersed in the coating composition, the inorganic particle powder comprises one or more of bismuth oxide powder and lead oxide powder, and the specific surface area of the inorganic particle powder is 8-10 m 2 /g. According to the embodiment of the application, the coating composition is used for the electrode assembly, so that the risk of deterioration of the electrode assembly and the electrolyte by rays can be reduced, and the stability of the battery cell is improved.

Inventors

• FANG SHENGHAO
• HONG HAIYI
• AI SHAOHUA
• ZHENG YI
• SUN CHENGDONG

Assignees

• 宁德时代新能源科技股份有限公司

Dates

Publication Date

20260512

Application Date

20241111

Claims (16)

1. 1. A coating composition comprising an inorganic particulate powder, wherein the inorganic particulate powder is in the form of spherical primary particles dispersed in the coating composition; the inorganic particle powder comprises one or more of bismuth oxide powder and lead oxide powder; The specific surface area of the inorganic particle powder is 8-10 m 2 /g.
2. 2. The coating composition according to claim 1, wherein the mass percentage of the inorganic particle powder is 1% -5% based on the coating composition.
3. 3. The coating composition according to claim 1 or 2, wherein the volume distribution particle diameter Dv10 of the inorganic particle powder is 5.00-6.50 μm; the volume distribution particle diameter Dv50 of the inorganic particle powder is 11.5.00-14.70 mu m; the volume distribution particle diameter Dv90 of the inorganic particle powder is 23.00-27.00 mu m; the volume distribution particle size Dv99 of the inorganic particle powder is 35.00-42.00 mu m; The number distribution particle diameter Dn10 of the inorganic particle powder is 0.90-1.40 mu m.
4. 4. The coating composition according to any one of claims 1 to 3, wherein the inorganic particle powder has an average particle diameter of 19 to 22 μm.
5. 5. The coating composition of any one of claims 1-4, further comprising a binder dispersed on the surface of the inorganic particulate powder, the binder comprising one or more of polyvinylidene fluoride, styrene-butadiene rubber, and polymethyl methacrylate.
6. 6. A method of preparing a coating composition comprising: mixing materials containing soluble inorganic particle salt and alkali, and reacting to obtain inorganic particle sol; carrying out spray drying on the inorganic particle sol under preset conditions to obtain a coating composition containing inorganic particle powder; wherein the inorganic particle powder is spherical primary particles dispersed in the coating composition; The specific surface area of the inorganic particle powder is 8-10 m 2 /g.
7. 7. The method of preparing according to claim 6, wherein the soluble inorganic particulate salt comprises one or more of a soluble bismuth salt comprising one or more of bismuth nitrate, bismuth carbonate and bismuth chloride and a soluble lead salt comprising one or more of lead nitrate, lead carbonate and lead chloride; The base includes one or more of ammonia, sodium hydroxide, and sodium bicarbonate.
8. 8. The production method according to claim 6 or 7, characterized in that the molar ratio of the soluble inorganic particle salt to the base is 1:3 to 1:10 based on the number of moles of inorganic particle elements in the soluble inorganic particle salt and the number of moles of hydroxyl groups contained in the base.
9. 9. The method of any one of claims 6-8, wherein the preset conditions include at least one of: The spray drying temperature is 180-220 ℃; The air flow of spray drying is 10-60 m 3 /h; the spray-dried spray head is a conical solid spray head.
10. 10. A release film comprising a substrate and a coating layer provided on at least one surface of the substrate, wherein the coating layer comprises the coating composition according to any one of claims 1 to 5.
11. 11. The separator film according to claim 10, wherein the substrate comprises a porous base film having an average pore diameter of 30 to 200nm, and/or, The ratio of the average pore diameter of the porous base film to the average particle diameter of the inorganic particle powder is 1.3×10 -3 ～10.5*10 -3 .
12. 12. The separator according to claim 10, wherein the thickness of the coating is 1-5 μm, and/or, The surface density of the coating is 1-5 g/m 2 .
13. 13. The barrier film of any one of claims 10-12, wherein the barrier film has an absorptivity to radiation of 40% -50%.
14. 14. An electrode sheet comprising a current collector and a layer of material disposed on at least one surface of the current collector, the layer of material comprising the coating composition of any one of claims 1-5.
15. 15. A battery cell comprising the coating composition of any one of claims 1-5.
16. 16. A battery device comprising the battery cell of claim 15.

Description

Coating composition and preparation method thereof, isolating film, electrode plate, battery monomer and battery device Technical Field The application belongs to secondary batteries, and particularly relates to a coating composition and a preparation method thereof, a separation film, an electrode plate, a battery monomer and a battery device. Background The battery has been one of important energy sources in human production and life because it can convert chemical energy into electric energy, and thus is widely used in various fields such as electric tools, electric vehicles, electronic devices, etc. to supply electric energy thereto. With the wide application of batteries in various fields, the requirements on the performance of the batteries are also increasing, wherein the stability of the batteries has become one of the important points. Therefore, how to improve the stability of the battery is one of the technical problems to be solved by the battery at present. Disclosure of Invention The embodiment of the application provides a coating composition, a preparation method thereof, a separation film, an electrode plate, a battery monomer and a battery device, which are used for an electrode assembly, so that the risk of deterioration of the electrode assembly and electrolyte by rays can be reduced, and the stability of the battery monomer is improved. In a first aspect, an embodiment of the application provides a coating composition, which comprises inorganic particle powder, wherein the inorganic particle powder is spherical primary particle dispersed in the coating composition, the inorganic particle powder comprises one or more of bismuth oxide powder and lead oxide powder, and the specific surface area of the inorganic particle powder is 8-10 m 2/g. The coating composition provided by the embodiment of the application is inorganic particle powder with a specific morphology structure and specific surface area when being used for an electrode assembly. The inorganic particle powder with a specific morphology structure can provide more radiation absorption directions, the specific surface area in the range can provide more radiation absorption area, the radiation absorptivity is further improved, the risk of deterioration of the positive electrode active material, the electrolyte, the adhesive and the electrode interface by the radiation is reduced, and the stability of the battery cell is improved. Meanwhile, under the condition of a specific morphology structure and specific surface area, the inorganic particle powder with proper content can improve the total effective radiation absorption area, so that the risk of radiation deterioration of an electrode assembly and electrolyte is reduced, and the stability of the battery monomer is improved. In any embodiment of the application, the mass percentage of the inorganic particle powder is 1% -5% based on the coating composition. In any embodiment of the application, the volume distribution particle diameter Dv10 of the inorganic particle powder is 5.00-6.50 mu m, the volume distribution particle diameter Dv50 of the inorganic particle powder is 12.00-14.00 mu m, the volume distribution particle diameter Dv90 of the inorganic particle powder is 24.00-27.00 mu m, the volume distribution particle diameter Dv99 of the inorganic particle powder is 39.00-42.00 mu m, and the number distribution particle diameter Dn10 of the inorganic particle powder is 0.90-1.40 mu m. In any embodiment of the present application, the average particle diameter of the inorganic particle powder is 19 to 22 μm. In any embodiment of the present application, the coating composition further includes a binder dispersed on the surface of the inorganic particle powder, the binder including one or more of polyvinylidene fluoride, styrene-butadiene rubber, and polymethyl methacrylate. In a second aspect, the embodiment of the application provides a preparation method of a coating composition, which comprises the steps of mixing materials containing soluble inorganic particle salt and alkali, reacting to obtain inorganic particle sol, and carrying out spray drying on the inorganic particle sol under preset conditions to obtain the coating composition containing inorganic particle powder, wherein the inorganic particle powder is spherical and is dispersed in the coating composition once, and the specific surface area of the inorganic particle powder is 8-10 m 2/g. In any embodiment of the application, the soluble inorganic particulate salt comprises one or more of a soluble bismuth salt and a soluble lead salt, the bismuth salt comprises one or more of bismuth nitrate, bismuth carbonate and bismuth chloride, the lead salt comprises one or more of lead nitrate, lead carbonate and lead chloride, and the base comprises one or more of ammonia, sodium hydroxide and sodium bicarbonate. In any embodiment of the present application, the molar ratio of the soluble inorganic particulate salt to the