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Conductive binder material and preparation method thereof, negative pole piece and lithium ion battery

A technology of conductive binder and raw materials, applied in non-aqueous electrolyte battery electrodes, batteries, negative electrodes, etc., can solve the problems of poor conductivity, bonding failure, and easy pulverization of silicon-based materials, and achieves alleviation of pulverization and mitigation. Bond failure, high bond strength

Active Publication Date: 2020-12-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The first object of the present invention is to provide a conductive binder material, which has both the functions of conduction and bonding, so as to solve the problem of poor conductivity of silicon-based materials and problems in the cycle process when silicon-based materials are used as negative electrode active materials in the prior art. Adhesive failure and easy pulverization problems

Method used

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  • Conductive binder material and preparation method thereof, negative pole piece and lithium ion battery
  • Conductive binder material and preparation method thereof, negative pole piece and lithium ion battery
  • Conductive binder material and preparation method thereof, negative pole piece and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] S1) Preparation of binder material A1:

[0053] Prepare 10ml of 5% polyvinyl alcohol aqueous solution, put the polyvinyl alcohol aqueous solution into a 50ml polytetrafluoroethylene-lined hydrothermal kettle, place the hydrothermal kettle in an oven at 160°C, take it out after 6h, and place it in the air for natural cooling , that is, to obtain the binder material, denoted as A1.

[0054] S2) making of pole piece N1:

[0055] Mix 1 mass part of A1 and 9 mass parts of active material nano-silicon with a mortar, add 0.2ml of deionized water to obtain negative electrode slurry, and coat the negative electrode slurry on copper foil. The solid coating quality is 1mg / cm 2 , and then dried in a vacuum oven at 100°C for 12 hours, cut into pieces, and weighed. The obtained pole piece is designated as N1.

[0056] S3) Preparation of lithium-ion half-cell C1:

[0057] The separator is a 25 μm polypropylene film;

[0058] The electrolyte is composed of non-aqueous organic solv...

Embodiment 2

[0061] S1) Preparation of binder material A2:

[0062] Prepare 10ml of 8% polyvinyl alcohol aqueous solution, put the polyvinyl alcohol aqueous solution into a 100ml polytetrafluoroethylene-lined hydrothermal kettle, place the hydrothermal kettle in an oven at 200°C, take it out after 24 hours, and place it in the air for natural cooling , that is, to obtain the binder material, denoted as A2.

[0063] S2) making of pole piece N2:

[0064] 1 mass part of A2 and 9 mass parts of active material nano-silicon were mixed evenly with a mortar, and 0.2ml deionized water was added to obtain the negative electrode slurry, which was coated on the copper foil, and the solid coating mass was 1mg / cm 2 , and then dried in a vacuum oven at 100°C for 12 hours, cut into pieces, weighed, and the obtained pole piece was recorded as N2.

[0065] S3) Preparation of lithium-ion half-cell C2:

[0066] The separator is a 25 μm polypropylene film;

[0067] The electrolyte is composed of non-aqueo...

Embodiment 3

[0070] S1) Preparation of binder material A3:

[0071] Prepare 50ml of 20% polyvinyl alcohol aqueous solution, put the polyvinyl alcohol aqueous solution into a 200ml polytetrafluoroethylene-lined hydrothermal kettle, place the hydrothermal kettle in an oven at 250°C, take it out after 12h, and place it in the air for natural cooling , that is, to obtain the binder material, denoted as A3.

[0072] S2) making of pole piece N3:

[0073] 1 mass part of A3 and 9 mass parts of active material nano-silicon were mixed evenly with a mortar, and 0.2ml deionized water was added to obtain the negative electrode slurry, which was coated on the copper foil, and the solid coating mass was 1mg / cm 2 , and then dried in a vacuum oven at 100°C for 12 hours, cut into pieces, and weighed. The obtained pole piece is designated as N3.

[0074] S3) Preparation of lithium-ion half-cell C3:

[0075] The separator is a 25 μm polypropylene film;

[0076] The electrolyte is composed of non-aqueous ...

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Abstract

The invention provides a conductive adhesive material and a preparation method thereof, a negative pole piece and a lithium ion battery, and relates to the field of batteries. The conductive adhesivematerial comprises polyvinyl alcohol, sodium carboxymethyl cellulose, sodium alginate, chitosan, polyethyleneimine and other polymers rich in hydroxyl groups, carboxyl groups and amino groups as raw materials, and a polymer carbon dot aqueous solution is prepared through high-temperature and high-pressure or microwave treatment. By utilizing a conductive binder material, the problems that in the prior art, when a silicon-based material is used as a negative electrode active material, the silicon-based material is poor in conductivity and is easy to fall off from a pole piece can be solved, andthe purposes of improving the conductivity of the pole piece and the binding power of the pole piece material so as to improve the energy density of the silicon negative electrode pole piece are achieved.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a conductive binder material and a preparation method thereof, a negative electrode sheet and a lithium ion battery. Background technique [0002] At present, in commercial lithium-ion batteries, the active material of the anode is mainly graphite. However, due to the limited mass-specific capacity of graphite and little room for improvement in volume-specific capacity, lithium-ion batteries using graphite as the anode active material cannot meet the needs of future high-capacity and small-volume electronic devices. [0003] Through research, it has been found that silicon is the most promising anode material for lithium-ion batteries. The theoretical gram capacity of silicon-based materials is as high as 4200mAh / g, and the theoretical volume specific capacity is as high as 7200mAh / cm 3 . However, silicon-based materials have poor electrical conductivity, and conductive carbon black m...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/13H01M10/0525
CPCH01M4/622H01M4/13H01M10/0525H01M2004/027H01M2220/30Y02E60/10
Inventor 凌敏杜乔昆梁成都
Owner ZHEJIANG UNIV
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