Anode aqueous binder of lithium ion battery and preparation method thereof

A technology for water-based adhesives and lithium-ion batteries, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of increasing the production cost of water-based adhesives, low content of adhesive copolymers, affecting dispersion efficiency, etc. Achieve the effect of improving dispersion efficiency and film-forming properties, low surface tension and good cycle performance

Inactive Publication Date: 2016-05-11
BLUE OCEAN & BLACK STONE TECH CO LTD FUJIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The resulting adhesive copolymer has a low content and high viscosity, which affects the dispersion efficiency, and there ar

Method used

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  • Anode aqueous binder of lithium ion battery and preparation method thereof
  • Anode aqueous binder of lithium ion battery and preparation method thereof
  • Anode aqueous binder of lithium ion battery and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0041] In this example, sodium vinyl sulfonate, acrylic acid and ethyl acrylate are used as reactive emulsifiers, hydrophilic acrylic monomers and lipophilic acrylic monomers respectively, and the ratio of the three in the whole preparation process is 0.5:25 :60.

[0042] Prepare the emulsion of the lithium-ion battery negative electrode water-based adhesive according to the following steps: by weight, add in the reaction kettle in turn: 1.5 parts of sodium vinyl sulfonate, 25 parts of acrylic acid, 60 parts of ethyl acrylate and water, stir and mix, and rotate at a speed of 200rpm. Nitrogen, 72 ℃ constant temperature, add 0.5 parts of 10% ammonium persulfate aqueous solution to initiate polymerization, the reaction time is 50min; then slowly dropwise add 50 parts of acrylic acid, 120 parts of ethyl acrylate aqueous solution and 10 parts of 10% (mass percentage) The ammonium persulfate aqueous solution was added dropwise for 3 hours, and the temperature in the system was 75°C...

Embodiment 2

[0045] In the present embodiment, the components and proportions added to the reaction kettle in turn are: 1.5 parts of sodium vinyl sulfonate, 12.5 parts of acrylic acid, 30 parts of ethyl acrylate and water; the components and proportions of dripping are: 62.5 parts of acrylic acid , 150 parts of ethyl acrylate; All the other steps are with embodiment 1.

[0046] The prepared water-based adhesive is an emulsion viscous liquid with a solid content of 40% and a viscosity of 1000-1500mpa.s.

Embodiment 3

[0048] In this embodiment, the water-soluble acrylic monomer and the oil-soluble acrylic monomer are respectively hydroxyethyl acrylate and butyl acrylate, and the rest of the steps are the same as in embodiment 1.

[0049] The prepared water-based adhesive is an emulsion viscous liquid with a solid content of 50% and a viscosity of 1500mpa.s.

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Abstract

The invention belongs to the lithium ion battery technical field, discloses an anode aqueous binder of a lithium ion battery and a preparation method thereof. The preparation method of the anode aqueous binder of the lithium ion battery comprises follow specific steps: successively adding reactivity emulsifier, water soluble acrylic acid monomers, oil soluble acrylic acid monomers and initiator solution, mixing evenly, taking the mixture as base solution, heating up to initiate polymerization, keeping stirring, dripping the mixture of the water soluble and oil soluble acrylic acid monomers and the initiator solution, reacting, thus preparing the anode aqueous binder of the lithium ion battery. According to the anode aqueous binder and the preparation method of the invention, the problems that the anode aqueous binder of the lithium ion battery is high in viscosity and low in dispersion efficiency are solved; and the anode aqueous binder of the lithium ion battery prepared by the invention is low in viscosity and dosage, has excellent dispersion performance in electrode materials such as graphite and has excellent battery capacity exerting performance and cycle performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery negative electrode aqueous binder and a preparation method thereof. Background technique [0002] As an emerging industry, new energy projects are in line with the national policy of energy conservation, emission reduction and sustainable development, and are of great help to the adjustment and transformation of industrial structure. As a very important part of the new energy industry, lithium-ion secondary batteries are particularly important in this industry at present. [0003] With the development of science and technology and the improvement of people's material and cultural living standards, people's requirements for lithium-ion batteries are also getting higher and higher. Lithium-ion secondary batteries are widely used in 3C products such as mobile phones, electric vehicles and automobiles, and their capacity and service li...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/62H01M4/139
CPCH01M4/139H01M4/62H01M4/621H01M10/0525Y02E60/10C08F2/22C08F2/44C08F220/06Y02P70/50
Inventor 李强白丰瑞罗贺斌
Owner BLUE OCEAN & BLACK STONE TECH CO LTD FUJIAN
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