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Power type low-temperature lithium battery and preparation method thereof

A low-temperature lithium battery, power-type technology, applied in the manufacture of electrolyte batteries, secondary batteries, battery electrodes, etc., can solve the problems of high frequency of concentrated outbreaks of safety accidents, shortened use time, and reduced

Pending Publication Date: 2021-11-16
HENAN FUSEN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, lithium-ion batteries also have their own defects; batteries with excellent cycle performance under normal temperature conditions have significantly reduced service life and safety under high-temperature environmental conditions; Weak, poor power performance; Lithium battery industry, from May to August every year, the frequency of concentrated outbreaks of safety accidents in various fields using lithium batteries is particularly high
Disassemble the lithium battery that has worked under low temperature conditions, and there are many lithium precipitation phenomena on the surface of the negative electrode; as the seasons alternate between working under low temperature conditions and then switching to high temperature conditions, the frequency of accidents increases, indicating that low temperature charging and discharging of lithium batteries produces lithium precipitation. The problem is not only related to the reduction of actual use capacity, the deterioration of power performance, but also the reduction of safety performance

Method used

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  • Power type low-temperature lithium battery and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of positive electrode slurry and positive electrode sheet for lithium battery: use single-particle coated oxide large-particle lithium cobaltate as the positive electrode active material, and its weight content (relative to the weight of the powder, similar to the following) is 95.5%; Vinyl fluoride (PVDF molecular weight 1.3 million) is the binder, and its weight content is 1.0%; carbon nanotubes, conductive carbon black, and conductive graphite are used as conductive agents, and its weight content is 1.5%, 1.0%, and 1.0% respectively. The above materials are mixed by dry mixing at a stirring speed of 30HZ, dispersed at 200rpm, stirred for 2 hours, and the solvent methyl pyrrolidone (NMP) is added. Disperse and stir at 2000rpm for 5 hours to prepare positive electrode slurry, and lower the temperature to normal temperature to test the viscosity and fineness of the slurry. The positive electrode slurry is evenly coated on the aluminum foil of the positive el...

Embodiment 2

[0038] Preparation of positive electrode slurry and positive electrode sheet for lithium battery: use single-particle coated oxide large-particle lithium cobaltate as the positive electrode active material, and its weight content (relative to the weight of the powder, similar to the following) is 95.4%; Vinyl fluoride (PVDF molecular weight 1.3 million) is the binder, and its weight content is 1.0%; carbon nanotubes, conductive carbon black, and conductive graphite are used as conductive agents, and its weight content is 1.2%, 1.2%, and 1.2% respectively. The above materials are mixed by dry mixing at a stirring speed of 30HZ, dispersed at 200rpm, stirred for 2 hours, and the solvent methyl pyrrolidone (NMP) is added. Disperse and stir at 2000rpm for 5 hours to prepare positive electrode slurry, and lower the temperature to normal temperature to test the viscosity and fineness of the slurry. The positive electrode slurry is evenly coated on the aluminum foil of the positive el...

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Abstract

The invention relates to the technical field of lithium batteries, in particular to a power type low-temperature lithium battery and a preparation method thereof. The lithium battery comprises a positive current collector and a positive plate coating the positive current collector. The lithium battery is prepared from, by weight, 90-98 parts of lithium cobalt oxide, 0.4-2 parts of nanotube conductive agent, 0.4-2 parts of conductive agent, 6-0.8 part of binder, 94-97 parts of graphite, 0.4-2 parts of conductive carbon black, 1-5 parts of a polyacrylate binder and 0.5-2 parts of an additive. The 3C detection discharge capacity of the lithium battery under the environment condition of-40 DEG C reaches 80% or above of the initial capacity under the environment condition of 25 DEG C, the power performance of the lithium battery under the low-temperature condition is excellent, and the safety performance of the lithium battery is relatively outstanding; and compared with the performance of an existing lithium battery, the 0.2 C discharge capacity of the lithium battery of the invention under the low temperature condition reaches 70% of the capacity under the environment condition of 25 DEG C, the discharge capacity of the lithium battery is greatly improved, the application field range of the lithium battery is widened, and meanwhile, the safety problem of the lithium battery is relatively solved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a power type low-temperature lithium battery and a preparation method thereof. Background technique [0002] At present, compared with nickel-metal hydride and nickel-cadmium batteries, lithium-ion batteries are in the leading position in the 3C (computer, communication, consumer electronics) field with absolute advantages; at the same time, in order to meet the requirements of energy conservation and environmental protection, electric vehicles (including electric bicycles and electric vehicles) Automobile) has a broad market prospect. As a power source for electric vehicles, lithium-ion batteries are very competitive. [0003] However, lithium-ion batteries also have their own defects; batteries with excellent cycle performance under normal temperature conditions have significantly reduced service life and safety under high-temperature environmental conditions; Weak,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/131H01M4/133H01M4/1391H01M4/1393H01M4/525H01M4/587H01M10/058
CPCH01M4/131H01M4/525H01M4/1391H01M4/133H01M4/1393H01M4/587H01M10/0525H01M10/058H01M2004/028H01M2004/027Y02P70/50Y02E60/10
Inventor 曹智铭
Owner HENAN FUSEN NEW ENERGY TECH
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