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Electrode binder and preparation method thereof, negative plate and secondary battery

A technology of binder and negative electrode, which is applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of poor stability of SEI film, powder dropping and shedding of electrode sheets, and achieve improved electrochemical performance, easy control, and reduced Effect of Electrode Internal Resistance

Active Publication Date: 2021-07-20
SHENZHEN EUBO NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of this application is to provide an electrode binder and its preparation method, a negative electrode sheet, and a secondary battery, aiming to solve the problems caused by the volume expansion of existing silicon-based negative electrode materials during charging and discharging to a certain extent. Problems such as electrode powder falling, falling off, poor stability of SEI film, etc.

Method used

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  • Electrode binder and preparation method thereof, negative plate and secondary battery
  • Electrode binder and preparation method thereof, negative plate and secondary battery

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preparation example Construction

[0023] The first aspect of the embodiment of the present application provides a method for preparing an electrode binder, comprising the steps of:

[0024] S10. Preparation of ether-containing functionalized organosilicon polymers;

[0025] S20. Mix polyacrylic acid, amino group-containing silane coupling agent, and ether-containing functional silicone polymer to obtain an electrode binder.

[0026] The preparation method of the electrode binder provided in the first aspect of the present application, after preparing the functionalized silicone polymer containing ethers, fully mixes it with polyacrylic acid and amino-containing silane coupling agent to obtain the electrode binder , the preparation process is simple, the operation is convenient, easy to control, the production condition is mild, and it is suitable for industrialized large-scale production and application. The electrode binder prepared in the embodiment of the present application is a water-soluble composite bi...

Embodiment 1

[0052] A kind of ether-containing organosilicon polymer, its preparation comprises the steps:

[0053] At room temperature, 100 grams of hydrogen-containing silicone oil with a hydrogen content of 0.5% (molecular formula (CH 3 ) 3 SiO[(CH3 ) 2 SiO]m[(CH 3 )(H)SiO]nSi(CH 3 ) 3 , m=45, n=25, the number average molecular weight is 5000), and 161g of ether-containing functional reagent polyethylene glycol monoallyl ether (polymerization degree n=6), containing ether functional reagent and containing The molar equivalent ratio of the hydrogen content of hydrogen silicone oil is 1:1, 0.5g of platinum (0)-1,3-diethylene-1,1,3,3-tetramethyldisiloxane, 60g of toluene, in a violent Stir to make it evenly mixed, raise the temperature to 110°C, and reflux and stir at this temperature for 12h. After natural cooling, the product was distilled off under reduced pressure at 80° C. to remove the solvent to obtain an ether-containing silicone polymer.

Embodiment 2

[0055] A kind of ether-containing organosilicon polymer, its preparation comprises the steps:

[0056] At room temperature, 100 grams of hydrogen-containing silicone oil (molecular formula (CH 3 ) 3 SiO[(CH 3 ) 2 SiO]m[(CH 3 )(H)SiO]nSi(CH 3 ) 3 , m=68, n=80, the number average molecular weight is 10000), and 558.72g of polyethylene glycol monoallyl ether (polymerization degree n=12) containing ether functionalization reagent, containing ether functionalization reagent and The molar equivalent ratio of the hydrogen content of the hydrogen-containing silicone oil is 1.2:1, 1.0g of platinum (0)-1,3-diethylene-1,1,3,3-tetramethyldisiloxane, 100g of toluene, in Stir vigorously to make it evenly mixed, raise the temperature to 110°C, and stir under reflux at this temperature for 24h. After natural cooling, the product was distilled off under reduced pressure at 80° C. to remove the solvent to obtain an ether-containing silicone polymer.

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Abstract

The invention belongs to the technical field of batteries, and particularly relates to an electrode binder and a preparation method thereof, a negative plate and a secondary battery. The preparation method of the electrode binder comprises the following steps: preparing an ether-containing functionalized organosilicon polymer; and mixing polyacrylic acid, an amino-containing silane coupling agent and the ether-containing functionalized organosilicon polymer to obtain the electrode binder. The preparation method of the electrode binder is simple in process, easy and convenient to operate, easy to control, mild in production condition and suitable for industrial large-scale production and application. The prepared electrode binder can form an elastic cross-linked network structure, is excellent in binding performance, can effectively inhibit volume expansion of silicon and other negative electrode materials, inhibits pulverization of pole piece active substances, and keeps integrity of silicon-based and other negative electrode materials in the battery charging and discharging process, so that the battery cycle stability of the silicon negative electrode materials is improved.

Description

technical field [0001] The application belongs to the technical field of batteries, and in particular relates to an electrode binder and a preparation method thereof, a negative electrode sheet, and a secondary battery. Background technique [0002] Lithium-ion batteries are widely used in various fields, such as portable mobile devices, electric vehicles, energy storage power stations, etc., due to their advantages such as high energy density, high operating voltage, long cycle life and no memory effect. In recent years, the booming electric vehicle market has a growing demand for improved performance of lithium-ion batteries, especially power lithium batteries with high energy density to improve cruising range. The theoretical specific capacity of silicon-based anode materials is as high as 4200mA h / g, and it has a relatively high discharge potential. It is also rich in resources and low in price. It has become the most concerned lithium-ion battery anode material in recen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/622H01M10/0525H01M4/628Y02E60/10
Inventor 岳风树方勇童蓉李士成池丽林
Owner SHENZHEN EUBO NEW MATERIAL TECH