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Preparation method of enhanced polyvinylidene fluoride lithium battery conductive adhesive

A polyvinylidene fluoride and conductive binder technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of lithium-ion battery discharge capacity decline, battery system safety hazards, active material shedding, etc. Electrochemical properties, enhanced interfacial stability, and improved bonding properties

Inactive Publication Date: 2019-05-10
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polyvinylidene fluoride resin binder tends to swell in the electrolyte in the positive electrode system, causing the active material to fall off from the positive electrode current collector, causing the discharge capacity of the lithium-ion battery to decline rapidly with the charge-discharge cycle. The battery system poses a great safety hazard, and the application field is limited

Method used

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  • Preparation method of enhanced polyvinylidene fluoride lithium battery conductive adhesive

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of enhanced binder: put the silane coupling agent mixture, PVDF, and NMP in a round-bottomed flask at a mass ratio of 1:5:50, and magnetically stir for 1 hour to obtain the enhanced polymer modified by the silane coupling agent. Vinylidene fluoride binder. Among them, the mass ratio of KH550 and KH570 is 0.28:0.72.

[0021] Preparation of positive electrode homogeneous slurry: Mix the positive active material commercial ternary material NCM523, conductive carbon, reinforced polyvinylidene fluoride binder, and NMP according to the mass ratio of 17:2:10:80, and perform ball milling for 1.5h. homogeneously to obtain positive electrode slurry.

[0022] Test sample preparation: Coat the positive electrode slurry on an aluminum foil with a thickness of 15um, dry it, and prepare samples according to the sample preparation requirements in "GB / T2790-1995 Adhesive 180° Peel Strength Test Method Flexible Materials Versus Rigid Materials" test, the result of which is ...

Embodiment 2

[0024] Preparation of reinforced binder: put silane coupling agent mixture:PVDF:NMP in a round bottom flask according to the mass ratio of 2:5:40, and magnetically stir for 3h to obtain the reinforced polymer modified by silane coupling agent. Vinylidene fluoride binder. Among them, the mass ratio of KH560, KH550 and KH570 is 0.4:0.2:0.4.

[0025] Preparation of homogeneous positive electrode slurry: mix the positive active material commercial ternary material NCM523, conductive carbon, reinforced polyvinylidene fluoride binder, and NMP according to the mass ratio of 17:2:10:80, and perform ball milling for 3 hours to mix , to obtain positive electrode slurry.

[0026] Test sample preparation: Coat the positive electrode slurry on an aluminum foil with a thickness of 15um, dry it, and prepare samples according to the sample preparation requirements in "GB / T2790-1995 Adhesive 180° Peel Strength Test Method Flexible Materials Versus Rigid Materials" test, the result of which i...

Embodiment 3

[0028] Preparation of reinforced binder: put the silane coupling agent mixture: PVDF: NMP in a round bottom flask according to the mass ratio of 2:5:50, and magnetically stir for 2 hours to obtain the reinforced polymer modified by silane coupling agent. Vinylidene fluoride binder. The silane coupling agent mixture is made by mixing KH560, KH550, KH570, and KH792 in a mass ratio of 0.35:0.25:0.1:0.3.

[0029] Preparation of homogeneous positive electrode slurry: Mix positive active material commercial ternary material NCM523, conductive carbon, reinforced polyvinylidene fluoride binder, and NMP at a mass ratio of 17:2:10:80, and perform ball milling for 2 hours to mix , to obtain positive electrode slurry.

[0030] Test sample preparation: Coat the positive electrode slurry on an aluminum foil with a thickness of 15um, dry it, and prepare samples according to the sample preparation requirements in "GB / T2790-1995 Adhesive 180° Peel Strength Test Method Flexible Materials Versu...

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Abstract

The invention discloses a preparation method of enhanced polyvinylidene fluoride lithium battery conductive adhesive. The method comprises the following steps of adding a mixture of polyvinylidene fluoride, N-methyl pyrrolidinone and a silane coupling agent into a round-bottom flask according to the raw material mass part ratio being 5: (40-50): (1-4); magnetically stirring for 1-3 h, uniformly mixing to obtain the enhanced PVDF adhesive. The manufactured enhanced PVDF adhesive is mixed with the positive active material and the conductive carbon and then added into a ball-milling tank to manufacture uniform slurry; the manufactured uniform slurry is coated on an aluminum foil current collector to improve the bonding intensity of the polyvinylidene fluoride adhesive. The preparation methoddisclosed by the invention is simple in process and easy to operate, and the modified effect is obvious. The modified adhesive prepared by the invention can be applied to the preparation of the lithium ion battery positive plate.

Description

technical field [0001] The invention relates to the field of modification of conductive binders for lithium ion batteries, in particular to a method for preparing a reinforced polyvinylidene fluoride lithium battery conductive binder modified with a silane coupling agent. The modified binder prepared by the invention can be applied to the preparation of positive electrode sheets of lithium ion batteries. Background technique [0002] Due to the advantages of high voltage, good safety performance, low environmental pollution, and no memory effect, lithium-ion batteries are an important technical means to solve environmental pollution and energy crises. Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, separators, electrolytes and other components. Binder is an important auxiliary material for the preparation of positive and negative electrodes of batteries, and has an important impact on the overall performance of lithium-ion batteries. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCY02E60/10
Inventor 翁景峥卢合欢彭黎波童庆松
Owner FUJIAN NORMAL UNIV
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