Method for manufacturing polymer lithium ion battery

A technology of lithium-ion batteries and manufacturing methods, applied in the direction of secondary batteries, final product manufacturing, sustainable manufacturing/processing, etc., capable of solving performance degradation such as battery capacity and cycle, reducing the content of active materials in electrodes, and unstable passivation films Decomposition and other issues to achieve the effect of improving capacity and cycle performance, improving thermal stability, and ensuring battery performance

Inactive Publication Date: 2009-02-18
TIANJIN LISHEN BATTERY
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  • Abstract
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  • Claims
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Problems solved by technology

[0007] However, these methods all have certain problems, such as the anti-bulging effect is not obvious, or the additive itself will decompose at high temperature, or the passive film formed on the surface of the negative electrode is unstable and decomposed, or the addition of the additive reduces the electrode The content of active substances will lead to a decrease in charge and discharge efficiency, and a decrease in battery capacity, cycle performance, etc.

Method used

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  • Method for manufacturing polymer lithium ion battery
  • Method for manufacturing polymer lithium ion battery

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Embodiment 1

[0029] Positive electrode preparation: 93% LiCoO 2 , 4% conductive carbon black and 3% polyvinylidene fluoride (PVDF) were mixed in N-methylpyrrolidone (NMP) to form a slurry, evenly coated on the aluminum current collector, and finally dried and compacted at 100 ° C, cut into 51.5 mm*551mm size, and weld the aluminum tab at one end to get the positive pole.

[0030] Negative electrode preparation: 90% mesocarbon microspheres (MCMB), 4% conductive carbon black and 6% polyvinylidene fluoride (PVDF) were mixed into a slurry in N-methylpyrrolidone (NMP), and evenly coated on the copper collector On the fluid, it was finally dried and compacted at 100°C, cut into a size of 53mm*540mm, and welded a nickel tab at one end to obtain a negative electrode.

[0031] Preparation of polymer-coated matrix diaphragm: Mix PVDF-HFP copolymer with an average molecular weight of 500,000 in acetone to form a slurry, and evenly coat it on a polypropylene / polyethylene / polypropylene (PP / PE / PP) diap...

Embodiment 2

[0040] Positive electrode preparation: 93% LiCoO 2 , 4% conductive carbon black and 3% polyvinylidene fluoride (PVDF) were mixed in N-methylpyrrolidone (NMP) to form a slurry, evenly coated on the aluminum current collector, and finally dried and compacted at 100 ° C, cut into 51.5 mm*551mm size, and weld the aluminum tab at one end to get the positive pole.

[0041] Negative electrode preparation: 90% mesocarbon microspheres MCMB, 4% conductive carbon black and 6% polyvinylidene fluoride (PVDF) were mixed into a slurry in N-methylpyrrolidone (NMP), and evenly coated on the copper current collector , and finally dried and compacted at 100°C, cut into a size of 53mm*540mm, and welded a nickel tab at one end to obtain a negative electrode.

[0042] Preparation of polymer-coated matrix diaphragm: Mix PVDF-HFP copolymer with an average molecular weight of 460,000 and polymethacrylate in NMP to form a slurry, and evenly coat both surfaces of a polyethylene (PE) diaphragm with a th...

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Abstract

The invention discloses a manufacturing method of polymer lithium ion battery to provide a manufacturing method of polymer lithium ion battery capable of preventing a cathode surface passivation film from decomposition and inhibiting secondary reaction between an electrolyte solvent and the anode and the cathode to reduce gas and control thickness of the battery effectively so as to prevent the battery from tympanites and deformation. The method comprises steps of: respectively coating the polymer substrate slurry on both surfaces of the dissepiment, and drying the same; roiling the anode, the cathode and the dissepiment coated with the polymer substrate to battery core and packaging the same in an aluminum plastic package film, drying the same to remove surplus water; infusing non water electrolyte to the aluminum plastic package film and sealing, the non water electrolyte composed of lithium salts, film forming additives, anti-tympanites additive triphenyl organic phosphate and the solvent; depositing the battery core sealed at 60 deg C to 120 deg C, enabling the non water electrolyte and the polymer substrate to form gel phase to obtain the polymer lithium ion battery of the invention.

Description

technical field [0001] The invention relates to a method for manufacturing a polymer lithium ion battery, more specifically, relates to a method for manufacturing a polymer lithium ion battery suitable for use under high temperature conditions. Background technique [0002] With the continuous development of science and technology, new electronic devices have an increasingly urgent demand for high-energy rechargeable batteries, and environmental protection also puts forward new requirements for batteries. At present, secondary rechargeable batteries mainly include lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries, lithium-ion batteries and fuel cells. Among them, lithium-ion batteries have the advantages of high voltage, many cycle times, and long storage time. They are recognized as efficient green energy sources, so they have developed rapidly in recent years. [0003] Lithium-ion batteries can be divided into liquid lithium-ion batteries and p...

Claims

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Application Information

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IPC IPC(8): H01M10/38H01M10/40H01M10/0587
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 黄庆华高俊奎滕彦梅王贵超
Owner TIANJIN LISHEN BATTERY
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