Low-moisture lithium-ion battery diaphragm

Abstract

The invention relates to the field of the preparation of lithium ion batteries, in particular to a low-moisture lithium-ion battery diaphragm. Paste for preparing a lithium-ion battery diaphragm coating comprises the following components in parts by weight: 35 to 41 parts of filler, 4.5 to 5.5 parts of a binder, 0.3 to 0.8 part of a dispersing agent, 0.3 to 0.7 part of a thickening agent, and 50 to 60 parts of a solvent. The paste and the formed coating have the characteristic of low moisture, thereby being capable of greatly reducing the baking cost for customers and further enhancing the battery performance, and having high consistency and stability, so as to meet customer requirements.

Description

technical field

[0001] The invention relates to the field of lithium-ion battery preparation, in particular to a low-moisture lithium-ion battery diaphragm. Background technique

[0002] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charged, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge.

[0003] At present, the lithium-ion battery separators we use in modern society are generally polyethylene or polypropylene separators. Such separators have better acid and alkali resistance, higher tensile strength, porosity and other properties. But in our battery production p...

Examples

Embodiment 1

[0033]a) Weigh 0.15Kg of dispersant (model: SN5040, supplier: Guangzhou Huixiang Chemical Co., Ltd.) and add it to 15Kg of pure water and stir until it is completely dispersed and uniform to form a dispersion. Take 0.12Kg of thickener (model: CMC1220 (supplier: Suzhou Fosai New Material Co., Ltd.) is added to the dispersion, and after stirring evenly, 10kg of nano-alumina powder (filler D50 = 0.95μm) is added to the solution to make slurry A, and the slurry A carries out high-speed dispersion, after cooling to normal temperature, (take by weighing 1.33kg) low water-absorbing molecular weight is 200,000-500,000, solid content is 44-46% aqueous acrylic resin aqueous solution (model: BM-930B, supplier: Japan ZEON Co., Ltd.) into the dispersed slurry, fully stirred, after stirring evenly, the low-moisture slurry is prepared in this way;

[0034] b) Take a base film with a thickness of 16 μm, and apply the low-moisture slurry on one side of a polyethylene-based film (supplier: Mits...

Embodiment 2

[0036] a) Weigh 0.15Kg of dispersant (model: SN5040, supplier: Guangzhou Huixiang Chemical Co., Ltd.) and add it to 15Kg of pure water and stir until it is completely dispersed and uniform to form a dispersion. Take 0.12Kg of thickener (model: CMC1220 (supplier: Suzhou Fosai New Material Co., Ltd.) is added to the dispersion, and after stirring evenly, 10kg of nano-alumina powder (filler D50 = 0.95μm) is added to the solution to make slurry A, and the slurry A high-speed dispersion, after cooling to normal temperature, (weigh 1.33kg) low water absorption molecular weight is 1-50 million, solid content is 44-46% aqueous acrylic resin aqueous solution (model: BM-930B, supplier: Japan ZEON Co., Ltd.) into the dispersed slurry, fully stirred, after stirring evenly, the low-moisture slurry is prepared in this way;

[0037] b) Take a base film with a thickness of 16 μm, apply the low-moisture slurry on one side of the polyethylene-based film by micro-gravure roller coating, and the ...

Embodiment 3

[0039] a) Weigh 0.15Kg of dispersant (model: SN5040, supplier: Guangzhou Huixiang Chemical Co., Ltd.) and add it to 15Kg of pure water and stir until it is completely dispersed and uniform to form a dispersion. Take 0.12Kg of thickener (model: CMC1220 (supplier: Suzhou Fosai New Material Co., Ltd.) is added to the dispersion, and after stirring evenly, 10kg of nano-alumina powder (filler D50 = 0.95μm) is added to the solution to make slurry A, and the slurry A high-speed dispersion, after cooling to normal temperature, (weigh 1.33kg) low water absorption molecular weight is 1-50 million, solid content is 44-46% aqueous acrylic resin aqueous solution (model: BM-930B, supplier: Japan ZEON Co., Ltd.) into the dispersed slurry, fully stirred, after stirring evenly, the low-moisture slurry is prepared in this way;

[0040] b) Take a base film with a thickness of 16 μm, apply the low-moisture slurry on one side of the polyethylene-based film by micro-gravure roller coating, and the ...

technical field

[0001] The invention relates to the field of lithium-ion battery preparation, in particular to a low-moisture lithium-ion battery diaphragm. Background technique

[0002] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charged, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge.

[0003] At present, the lithium-ion battery separators we use in modern society are generally polyethylene or polypropylene separators. Such separators have better acid and alkali resistance, higher tensile strength, porosity and other properties. But in our battery production p...

Examples

Embodiment 1

[0033]a) Weigh 0.15Kg of dispersant (model: SN5040, supplier: Guangzhou Huixiang Chemical Co., Ltd.) and add it to 15Kg of pure water and stir until it is completely dispersed and uniform to form a dispersion. Take 0.12Kg of thickener (model: CMC1220 (supplier: Suzhou Fosai New Material Co., Ltd.) is added to the dispersion, and after stirring evenly, 10kg of nano-alumina powder (filler D50 = 0.95μm) is added to the solution to make slurry A, and the slurry A carries out high-speed dispersion, after cooling to normal temperature, (take by weighing 1.33kg) low water-absorbing molecular weight is 200,000-500,000, solid content is 44-46% aqueous acrylic resin aqueous solution (model: BM-930B, supplier: Japan ZEON Co., Ltd.) into the dispersed slurry, fully stirred, after stirring evenly, the low-moisture slurry is prepared in this way;

[0034] b) Take a base film with a thickness of 16 μm, and apply the low-moisture slurry on one side of a polyethylene-based film (supplier: Mits...

Embodiment 2

[0036] a) Weigh 0.15Kg of dispersant (model: SN5040, supplier: Guangzhou Huixiang Chemical Co., Ltd.) and add it to 15Kg of pure water and stir until it is completely dispersed and uniform to form a dispersion. Take 0.12Kg of thickener (model: CMC1220 (supplier: Suzhou Fosai New Material Co., Ltd.) is added to the dispersion, and after stirring evenly, 10kg of nano-alumina powder (filler D50 = 0.95μm) is added to the solution to make slurry A, and the slurry A high-speed dispersion, after cooling to normal temperature, (weigh 1.33kg) low water absorption molecular weight is 1-50 million, solid content is 44-46% aqueous acrylic resin aqueous solution (model: BM-930B, supplier: Japan ZEON Co., Ltd.) into the dispersed slurry, fully stirred, after stirring evenly, the low-moisture slurry is prepared in this way;

[0037] b) Take a base film with a thickness of 16 μm, apply the low-moisture slurry on one side of the polyethylene-based film by micro-gravure roller coating, and the ...

Embodiment 3

[0039] a) Weigh 0.15Kg of dispersant (model: SN5040, supplier: Guangzhou Huixiang Chemical Co., Ltd.) and add it to 15Kg of pure water and stir until it is completely dispersed and uniform to form a dispersion. Take 0.12Kg of thickener (model: CMC1220 (supplier: Suzhou Fosai New Material Co., Ltd.) is added to the dispersion, and after stirring evenly, 10kg of nano-alumina powder (filler D50 = 0.95μm) is added to the solution to make slurry A, and the slurry A high-speed dispersion, after cooling to normal temperature, (weigh 1.33kg) low water absorption molecular weight is 1-50 million, solid content is 44-46% aqueous acrylic resin aqueous solution (model: BM-930B, supplier: Japan ZEON Co., Ltd.) into the dispersed slurry, fully stirred, after stirring evenly, the low-moisture slurry is prepared in this way;

[0040] b) Take a base film with a thickness of 16 μm, apply the low-moisture slurry on one side of the polyethylene-based film by micro-gravure roller coating, and the ...

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