Modified biomass lithium ion battery adhesive

A technology of lithium-ion batteries and adhesives, which is applied in the direction of acidic copolymer adhesives, adhesive types, polysaccharide adhesives, etc., can solve problems such as polluting the environment, endangering the health of workers, and increasing battery costs, and achieves Improved coating performance and good film-forming performance

Active Publication Date: 2013-10-02
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the lithium-ion battery binders commonly used in the industrial production of lithium-ion batteries are homopolymers and copolymers of polyvinylidene fluoride (PVDF). Since PVDF needs to use N-methylpyrrolidone, N, N-dimethylamide, Dimethyl sulfoxide, etc. as a solvent not only pollutes the environment, endangers the health of the staff, but also increases the cost of the battery with organic solvents.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Dissolve 1g of sodium carboxymethyl cellulose and 0.5g of polyacrylic acid in 20mL of water and stir for 1 hour to form a gel evenly, then dry the water, keep it in a molten state in a vacuum oven at 150 degrees Celsius for two hours, and cool down to room temperature naturally Obtain the desired lithium ion battery binder.

Embodiment 2

[0016] Take 0.5g of the binder prepared in Example 1 and dissolve it in 10mL of water, add 10g of modified natural graphite and stir evenly to form a negative electrode slurry, then apply the slurry evenly on the copper foil, and then Drying, rolling, and punching to produce a circular negative electrode sheet with a radius of 12 mm and a thickness of 80 microns. After vacuum drying at a temperature of 120 degrees, place it in a glove box with a dry argon atmosphere, and pair it with a metal lithium electrode Assembled into a half-battery, the electrolyte uses 1M lithium hexafluorophosphate (EC / DMC=1:1(v)), the diaphragm uses a polypropylene diaphragm, and the lithium-ion half-battery prepared by this adhesive is charged and discharged at a current of 0.2C, and the first reversible capacity Up to 355mAh / g or more, and the electrode has no material drop.

[0017] Lithium cobaltate is used as the positive electrode, 1M lithium hexafluorophosphate (EC / DMC / EMC=1:1:1(v)) is used as...

Embodiment 3

[0019] Take 0.6g of the adhesive prepared in Example 1 and dissolve it in 10mL of water, add 10g of silicon-carbon composite material and stir evenly to form a negative electrode slurry, then apply the slurry evenly on the copper foil, and then Drying, rolling, and punching to produce a circular negative electrode sheet with a radius of 12 mm and a thickness of 80 microns. After vacuum drying at a temperature of 120 degrees, place it in a glove box with a dry argon atmosphere, and pair it with a metal lithium electrode Assembled into a half-battery, the electrolyte is 1M lithium hexafluorophosphate (EC / DMC / EMC=1:1:1(v)), the separator is a polypropylene separator, and the lithium-ion half-battery prepared by this adhesive is charged and discharged at a current of 0.2C , the first reversible capacity reaches 950mAh / g, and the electrode has no material drop phenomenon.

[0020] Using ternary materials as the positive electrode, 1M lithium hexafluorophosphate (EC / DMC / EMC=1:1:1(v)...

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Abstract

The invention relates to a preparation method of modified biomass lithium ion battery adhesives. According to the method, under high temperature and vacuum conditions, a plurality of natural polymers, such as sodium carboxymethylcellulose, sodium alginate, amylose, Arabia gum, carboxymethyl chitin, carboxymethyl chitosan and the like, and polyacrylic acid or polymethylacrylic acid undergo esterification crosslinking, so that a series of lithium ion battery adhesives can be prepared. The adhesives prepared by the invention can be applied in carbon based and silicon based lithium ion battery negative electrode materials at small dosages and can reach very good bonding effects. The film-forming property of materials can be improved substantially. Also, the adhesives prepared by the invention have the advantages of cheap and easily available raw materials, simple preparation method, environmental friendliness and no pollution, etc.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery adhesives, and relates to the preparation and application of a class of environment-friendly biomass-based lithium-ion battery adhesives. Background technique [0002] Biomass refers to the general term for all biological organisms produced by photosynthesis, including plants, crops, forest waste, marine products (various seaweeds) and urban waste, among which sodium carboxymethyl cellulose, sodium alginate, direct Amylopectin, gum arabic, carboxymethyl chitin, carboxymethyl chitosan, etc. are all biodegradable materials utilizing natural substances, which are renewable resources, consume less resources and energy, are environmentally friendly and low in price , and has no effect on human health. [0003] Improving the processability of biomass materials such as film-forming properties or modifying them for industrial production is of great significance to the environment and economy, especiall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/62C09J101/26C09J103/12C09J105/04C09J105/00C09J133/02C08J3/24
CPCY02E60/10
Inventor 崔光磊段玉龙刘志宏韩鹏献
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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