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Lithium ion battery electrode binder and application thereof

A lithium-ion battery and binder technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, lithium batteries, etc., can solve problems such as easy oxidation, difficult drying of aqueous phase systems, severe lithium dissolution, etc.

Inactive Publication Date: 2020-09-25
TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, few water-soluble binders are used in the positive electrode system. The commonly used water-soluble binder, styrene-butadiene rubber (SBR), contains unsaturated double bonds, and is easily oxidized when the voltage is higher than 4V; system, it will cause serious dissolution of lithium; the water phase system is difficult to dry and other problems

Method used

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  • Lithium ion battery electrode binder and application thereof
  • Lithium ion battery electrode binder and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The present embodiment provides a kind of positive electrode binder of lithium ion battery, and its preparation method comprises the following steps: 30g styrene-butadiene rubber emulsion (wherein solid content 40wt%) joins the four-neck flask that has condensing tube, mechanical stirrer and thermometer During the process, perform mechanical stirring at a speed of 500r / min, and add hydrazine hydrate when the temperature of the styrene-butadiene rubber emulsion rises above 55°C; weigh 2g of boric acid, dissolve it with deionized water, and add it to the reaction system in the four-necked flask; Measure the hydrogen peroxide solution (content 75%) of 30mL, dropwise in the reaction system in the four-neck flask with 1mL / min with peristaltic pump, dropwise process continues 30min, after dropwise, maintain original temperature and Pressure and other reaction conditions, continue to mechanically stir the reaction at a speed of 500r / min for 1 hour, stop heating, maintain the or...

Embodiment 2

[0042]The present embodiment provides a kind of positive electrode binder of lithium ion battery, and its preparation method comprises the following steps: join 30g lithium polyacrylate emulsion (wherein solid content 40wt%) to the four-necked flask that has condensing tube, mechanical stirrer and thermometer During the process, perform mechanical stirring at a speed of 400r / min, and add hydrazine hydrate when the temperature of the lithium polyacrylate emulsion rises above 75°C; weigh 2g of boric acid, dissolve it with deionized water, and add it to the reaction system in the four-necked flask; Measure 20mL of hydrogen peroxide solution (content 75%), and drop it into the reaction system in the four-necked flask with a peristaltic pump at a speed of 0.5mL / min. The dropping process lasts for 40min. According to the reaction conditions such as temperature and pressure, continue to mechanically stir the reaction at a speed of 400r / min for 1.5 hours, stop heating, maintain the ori...

Embodiment 3

[0045] The present embodiment provides a kind of positive electrode binder of lithium ion battery, and its preparation method comprises the following steps: join 20g polyacrylonitrile emulsion (wherein solid content 20wt%) to the four-neck flask that has condensing tube, mechanical stirrer and thermometer During the process, carry out mechanical stirring at a speed of 300r / min, and add hydrazine hydrate when the temperature of the polyacrylonitrile emulsion rises above 65°C; weigh 2g of boric acid, dissolve it with deionized water, and add it to the reaction system of the four-necked flask; Take 40mL of hydrogen peroxide solution (content 50%), and drop it into the reaction system with a peristaltic pump at 1mL / min. The dropping process lasts for 40min. Mechanically stir the reaction at a speed of 300r / min for 0.5 hours, stop heating, and maintain the original stirring speed, and when the temperature of the solution is lowered to room temperature, stop stirring and stop the rea...

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Abstract

The invention discloses a lithium ion battery electrode binder and application thereof. The lithium ion battery electrode binder is obtained by performing hydrogenation treatment on a binder containing unsaturated bonds, and the hydrogenation treatment is used for partially or completely changing the unsaturated bonds in the binder containing the unsaturated bonds into saturated bonds so as to form the lithium ion battery electrode binder; the binder containing the unsaturated bond comprises one or a combination of several of butadiene styrene rubber, carboxymethyl cellulose sodium, lithium polyacrylate, polyacrylonitrile and sodium alginate.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery binders, in particular to a lithium-ion battery electrode binder and its application. Background technique [0002] At present, in addition to improving the performance of positive electrode materials by doping, coating, adjusting microstructure, controlling material morphology, size distribution, specific surface area, and impurity content to improve its specific capacity, rate, cycle, compaction density, electrochemical, chemical In addition to thermal stability, the most critical thing is still to increase the capacity or voltage of the material. This requires the adhesive to work over a wide potential range. The current technology only uses water-based adhesive materials to avoid toxic and irritating organic solvent systems and improve the mechanical properties of the pole piece, but it is not fully suitable for high-voltage positive electrode systems. However, the capacity of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M10/052H01M10/0525
CPCH01M4/13H01M4/622H01M10/052H01M10/0525Y02E60/10
Inventor 毛泽民桂客
Owner TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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