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Conductive adhesive for lithium ion batteries, preparation method thereof, electrode plate of lithium ion battery, preparation method thereof and lithium ion battery

A lithium-ion battery, conductive binder technology, applied in non-aqueous electrolyte battery electrodes, battery electrodes, secondary batteries, etc. resistance increase and other problems, to achieve the effects of strong mechanical properties, low cost, and increased content

Active Publication Date: 2017-11-21
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the first aspect of the present invention provides a conductive adhesive for lithium-ion batteries, which has both good electrical conductivity and bonding performance, and has a certain strength, so as to solve the problem that existing lithium-ion batteries need to use adhesives at the same time. Binder and conductive agent, leading to the increase of the internal resistance of the battery cell, the problem of the energy density and first-time efficiency reduction of the battery cell; and the existing binder molecules cannot bind the micron-scale silicon particles to the overall pulverization and fragmentation, which leads to the silicon negative electrode The binder fails after pulverization, which eventually leads to the problem of rapid decay of the cycle performance of the battery cell

Method used

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  • Conductive adhesive for lithium ion batteries, preparation method thereof, electrode plate of lithium ion battery, preparation method thereof and lithium ion battery
  • Conductive adhesive for lithium ion batteries, preparation method thereof, electrode plate of lithium ion battery, preparation method thereof and lithium ion battery
  • Conductive adhesive for lithium ion batteries, preparation method thereof, electrode plate of lithium ion battery, preparation method thereof and lithium ion battery

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preparation example Construction

[0042] Correspondingly, an embodiment of the present invention provides a method for preparing the above-mentioned conductive adhesive for lithium ion batteries, comprising the following steps:

[0043] Graphene is obtained after oxidation treatment to obtain graphene oxide; the first binder is taken, and the first binder is grafted to the surface of the graphene oxide through a condensation reaction; or the monomer of the first binder is taken , the monomer of the first binder is polymerized and grafted to the surface of the graphene oxide by atom transfer radical polymerization to obtain the graphene grafted and modified by the first binder, that is, to obtain the lithium ion Conductive adhesive for batteries; the first adhesive includes polyvinyl alcohol, carboxymethyl cellulose, polyethylene glycol, polylactic acid, polymethyl methacrylate, polystyrene, polyvinylidene fluoride, hexa At least one of fluoropropylene polymer, styrene-butadiene rubber, sodium alginate, starch,...

Embodiment 1

[0060] A preparation method for a lithium-ion battery conductive binder, comprising the following steps:

[0061] (1) Weigh 10g of graphene, mix it with 100g of concentrated nitric acid (65wt%) aqueous solution, heat to 95°C, stir for 4h, wash and dry to obtain graphene oxide sample G;

[0062](2) Add 10g graphene oxide sample G to 100ml dimethyl sulfoxide (DMSO), add 2g thionyl chloride, stir and react at room temperature for 2h, after the reaction is completed, wash with DMSO, redisperse in DMSO, and add 2g of PVA, stirred at 120°C for 2h, washed with water and dried to obtain PVA graft-modified graphene G-PVA;

[0063] (3) Disperse G-PVA in water, first feed nitrogen to remove oxygen, then add 2g acrylic acid, 0.1g K 2 S 2 o 8 with 0.03g NaHSO 3 , heated to 55 ° C, reacted for 2-4h, the reaction was completed, dried after washing to obtain polyvinyl alcohol-polyacrylic acid (PVA-PAA) grafted graphene G-PVA-b-PAA;

[0064] (4) Disperse G-PVA-b-PAA in water, add LiOH aqu...

Embodiment 2

[0069] A preparation method for a lithium-ion battery conductive binder, comprising the following steps:

[0070] (1) Weigh 10 g of graphene, mix it with 100 g of concentrated nitric acid (65 wt%) aqueous solution, heat to 95° C., stir for 4 hours, wash and dry to obtain graphene oxide sample G.

[0071] (2) Disperse 10g of graphene oxide in 100ml of tetrahydrofuran (THF) under stirring, add 1g of diborane, stir at room temperature for 12h, and reduce the carboxyl, acid anhydride, carbonyl, etc. on the surface of graphene oxide to alcoholic hydroxyl groups; then use THF After washing and drying, redisperse in the mixed solution of 2g pyridine and 100mL dry ether, add 2g 2-bromoisobutyryl bromide (BiBB), stir slowly at 0°C for 2h, and then stir the reaction at room temperature for 10h. Drying after washing with absolute ethanol to obtain hydroxybrominated graphene oxide G-Br;

[0072] (3) Add 100mL of methanol, 3g of vinylidene fluoride, 0.02g of cuprous bromide (CuBr), and 0....

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Abstract

The invention provides a conductive adhesive for lithium ion batteries. The conductive adhesive comprises graphene and a first adhesive grafted to the surface of the graphene, and the first adhesive comprises at least one of polyvinyl alcohol, sodium carboxymethylcellulose, polyethylene glycol, polylactic acid, polymethyl methacrylate, polystyrene, polyvinylidene fluoride, hexafluoropropylene polymer, styrene-butadiene rubber, sodium alga acid, starch, cyclodextrin and polysaccharide. The conductive adhesive for lithium ion batteries has good conductivity and adhesive property, and is of certain strength, so that the integral mechanical strength of the electrode plate can be strengthened; the conductive adhesive realizes that the adhesive is combined with a conductive agent, so that the content of active substances in the electrode plate can be increased, and the energy density of cells is further increased. The invention also provides a preparation method of the conductive adhesive, an electrode plate containing the conductive adhesive and the lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a conductive binder for lithium-ion batteries and a preparation method thereof, a lithium-ion battery electrode pole piece and a preparation method thereof, and a lithium-ion battery. Background technique [0002] Due to the advantages of high energy density, long cycle life, and maintenance-free, lithium-ion batteries have been widely used in portable electronic devices, electric vehicles, and energy storage appliances. [0003] The existing lithium-ion battery preparation process is to disperse the active material (positive electrode or negative electrode active material) powder in a solvent with a conductive agent and a binder to form a slurry, and then coat it on a current collector (such as copper foil and aluminum foil). Pole pieces are formed on the top, and finally assembled into a complete battery cell. However, most of the existing commercial conductive agents exis...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525H01M4/13H01M4/139
CPCH01M4/13H01M4/139H01M4/622H01M4/625H01M10/0525H01M4/62Y02E60/10Y02T10/70H01M4/621H01M4/624
Inventor 王志勇夏圣安王平华
Owner HUAWEI TECH CO LTD
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