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A kind of preparation method of anti-overcharge lithium-ion battery pole piece

A lithium-ion battery, anti-overcharge technology, applied in the direction of battery electrodes, electrode manufacturing, secondary batteries, etc., can solve the problems of reduced battery cycle life, battery temperature rise, battery combustion, etc., to achieve increased internal resistance, Prevent powdering and reduce side effects

Active Publication Date: 2020-08-04
北电爱思特(江苏)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to solve the current common lithium-ion battery pole piece in the case of overcharging, over-discharging, damage and extrusion deformation, etc., causing the battery temperature to rise sharply, reducing the cycle life of the battery, and even causing battery damage. Defects of combustion and explosion, providing a preparation method for anti-overcharge lithium-ion battery pole pieces

Method used

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  • A kind of preparation method of anti-overcharge lithium-ion battery pole piece

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example 1

[0023] Weigh 24g of sodium alginate, grind and pulverize it for 8 minutes, pass through a 100-mesh sieve, collect the sieved sodium alginate powder, then weigh 5g of sodium lauryl sulfate, pour it into a beaker with 36mL of deionized water, and place it in ultrasonic dispersion Ultrasonic dispersion in the instrument for 16 minutes to obtain a self-made dispersion, continue to mix and stir the sieved sodium alginate powder and the self-made dispersion at a mass ratio of 1:4 to obtain a modified sodium alginate dispersion; weigh 12g of nano-alumina and Mix and grind 16g of nano-silica for 6 minutes to obtain a mixed powder, then mix the mixed powder, modified sodium alginate dispersion and deionized water in a beaker at a mass ratio of 5:1:7, and continue stirring for 1 hour to obtain a self-made coating Slurry: Weigh 45g of polyethylene and heat it up to 90°C to soften it, add 6mL of 2-bromoanisole and 2mL of N-methylpyrrolidone to the softened polyethylene, mix and stir for 24...

example 2

[0025]Weigh 28g of sodium alginate, grind and pulverize it for 9 minutes, pass through a 100-mesh sieve, collect the sieved sodium alginate powder, then weigh 6g of sodium lauryl sulfate, pour it into a beaker with 38mL of deionized water, and place it in an ultrasonic dispersion Ultrasonic dispersion in the instrument for 18 minutes to obtain a self-made dispersion, continue to mix and stir the sieved sodium alginate powder and the self-made dispersion at a mass ratio of 1:4 to obtain a modified sodium alginate dispersion; weigh 14g of nano-alumina and Mix and grind 18g of nano-silica for 7 minutes to obtain a mixed powder, then mix the mixed powder, modified sodium alginate dispersion and deionized water in a beaker with a mass ratio of 5:1:7, and continue stirring for 1.5 hours to obtain a self-made coating layer slurry; weigh 50g of polyethylene and heat it up to 95°C to soften it, add 7mL of 2-bromoanisole and 3mL of N-methylpyrrolidone to the softened polyethylene, mix an...

example 3

[0027] Weigh 32g of sodium alginate and grind it for 10min, pass it through a 100-mesh sieve, collect the sieved sodium alginate powder, then weigh 7g of sodium lauryl sulfate and pour it into a beaker with 42mL of deionized water, and place it in ultrasonic dispersion Ultrasonic dispersion in the instrument for 20 minutes to obtain a self-made dispersion, continue to mix and stir the sieved sodium alginate powder and the self-made dispersion at a mass ratio of 1:4 for 20 minutes to obtain a modified sodium alginate dispersion; weigh 16g of nano-alumina and Mix and grind 20g of nano-silica for 8 minutes to obtain a mixed powder, then mix the mixed powder, modified sodium alginate dispersion and deionized water in a beaker at a mass ratio of 5:1:7, and continue stirring for 2 hours to obtain a self-made coating Slurry: Weigh 55g of polyethylene and heat it up to 100°C to soften it, add 8mL of 2-bromoanisole and 4mL of N-methylpyrrolidone to the softened polyethylene, mix and sti...

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Abstract

The invention discloses a preparation method of an anti-overcharged lithium ion battery pole piece and belongs to the technical field of preparation of battery pole pieces. The preparation method disclosed by the invention has the benefits that firstly, sodium dodecyl sulfate is mixed with deionized water to obtain a self-made dispersing liquid, so that the internal resistance of a lithium ion battery is increased, and the side reaction between a negative electrode and an electrolyte is reduced; in addition, particles have high thermal stability; polyethylene, 2-bromoanisole and N-methyl pyrrolidone are subjected to mixed reaction continuously to obtain self-made thermal expansion latex, wherein the polyethylene is a thermal expansion polymer, and once the battery is overcharged or over-discharged, the thermal expansion polymer can quickly expand; in addition, the 2-bromoanisole contains an ortho-bromo group, and the ortho-bromo group increases the stability of a benzene ring Pi bond conjugate system to a certain extent; adsorption products can hinder ion migration, charge transfer and the like, so that the overall impedance property of the battery is increased, and the anti-overcharge and cycle performances of the lithium ion battery pole piece are further improved; therefore, the application prospect is wide.

Description

technical field [0001] The invention discloses a preparation method of an overcharge-proof lithium-ion battery pole piece, and belongs to the technical field of battery pole piece preparation. Background technique [0002] Lithium-ion battery is a new type of high-energy secondary chemical battery. Compared with other secondary batteries, it has high voltage, large specific energy, long cycle life, no pollution, no memory effect, small self-discharge, and high operating temperature range. With outstanding advantages, it is a kind of green chemical power source with broad development prospects. Especially in recent years, global resources and environmental protection issues have led to high prices of non-ferrous metals and rare earths, causing serious cost pressure and environmental protection pressure on conventional secondary batteries such as nickel-metal hydride batteries and lead-acid batteries. Lithium-ion batteries are used in most It has been unanimously recognized b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/133H01M4/136H01M4/04H01M10/0525
CPCH01M4/0404H01M4/133H01M4/136H01M10/0525Y02E60/10
Inventor 唐仕平杨明忠陈可
Owner 北电爱思特(江苏)科技有限公司
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