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Preparation method of silicon-based negative electrode binder of lithium battery and binder

A silicon-based negative electrode and binder technology, which is applied in battery electrodes, lithium batteries, conductive adhesives, etc., can solve the problems of less research on lithium battery binders, and achieve excellent electrochemical performance, low internal resistance, performance controllable effect

Active Publication Date: 2019-05-07
ZHEJIANG CASNOVO MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, block copolymers have been used as polymer electrolytes, thermoplastic elastomers, hot melt adhesives, polymer alloy compatibilizers, etc., but there are few studies on lithium battery binders

Method used

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  • Preparation method of silicon-based negative electrode binder of lithium battery and binder
  • Preparation method of silicon-based negative electrode binder of lithium battery and binder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In a 5L stainless steel polymerization reactor, add 2000mL deionized water, 18.0g n-hexadecane, 100.0g (meth)butyl acrylate, 6.0g sodium lauryl sulfate, 16g CHI 3 , 5.0g of potassium persulfate, cooled to 0°C, passed through high-purity nitrogen to exhaust oxygen until the oxygen content is lower than 5ppm, stirred at a high speed at 0°C for 30 minutes to obtain a fine emulsion; raised the temperature to 35°C for polymerization reaction for 3 hours, and obtained active polybutylacrylate seed emulsion;

[0027] Add 200g of styrene into the kettle, stir and disperse at room temperature, swell for 2h, raise the temperature to 45°C and continue the reaction for 5h, then stop;

[0028] Add 20g of 50wt% NaOH solution, stir and hydrolyze at 65°C for 5h, and adjust the pH to 7.0 with 1mol / L hydrochloric acid to obtain polyethylene-polybutylacrylate-polyacrylic acid-polystyrene block copolymer binder.

[0029] After diluting the aqueous solution of the above block copolymer bin...

Embodiment 2

[0032] In a 5L stainless steel polymerization reactor, add 2000mL deionized water, 18.0g n-hexadecane, 200.0g butyl methacrylate, 12.0g sodium lauryl sulfate, 50g CHI 3 , 8.0g potassium persulfate, cooled to 1°C, passed through high-purity nitrogen to exhaust oxygen until the oxygen content is lower than 5ppm, stirred at a high speed at 1°C for 30min to obtain a fine emulsion; raised the temperature to 35°C and polymerized for 2h to obtain active polybutylmethacrylate Ester seed emulsion;

[0033] Add 300g of styrene into the kettle, stir and disperse at room temperature, swell for 2.5h, raise the temperature to 45°C and continue the reaction for 6h, then stop;

[0034] Add 50g of 50wt% NaOH solution, stir and hydrolyze at 60°C for 5h, adjust the pH to 7.0 with 1mol / L hydrochloric acid, and obtain polyethylene-polybutylmethacrylate-polymethacrylic acid-polystyrene block copolymer binder .

[0035]After diluting the aqueous solution of the block copolymer binder to adjust the...

Embodiment 3

[0037] In a 5L stainless steel polymerization reactor, add 2000mL deionized water, 14.0g n-hexadecyl alcohol, 150.0g (meth)methyl acrylate, 10.0g cetyltrimethylammonium bromide, 45g IC 4 f 8 1, 10.0g azobiscyanovaleric acid, cooled to 2°C, feed high-purity nitrogen gas to exhaust oxygen until the oxygen content is lower than 5ppm, stir at a high speed at 2°C for 30min to obtain a fine emulsion; heat up to 35°C for polymerization for 2.5h, and obtain Active polymethyl acrylate seed emulsion;

[0038] Add 600g of styrene into the kettle, stir and disperse at room temperature, swell for 3.0h, raise the temperature to 40°C and continue the reaction for 6h, then stop;

[0039] Add 30g of 50wt% NaOH solution, stir and hydrolyze at 65°C for 5h, and adjust the pH to 7.0 with 1mol / L hydrochloric acid to obtain polyethylene-polymethylacrylate-polyacrylic acid-polystyrene block copolymer binder.

[0040] After diluting the aqueous solution of the above block copolymer binder to adjust ...

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Abstract

The invention discloses a preparation method of a silicon-based negative electrode binder of a lithium battery and the binder. The preparation method comprises the following steps: firstly, polymerizing an iodine-transfer active radical fine emulsion to prepare a polyacrylate seed emulsion, then adding styrene monomers for further polymerization, and finally, carrying out partial hydrolysis on theblock copolymer under an alkaline condition to obtain the polyethylene-polyacrylate-polyacrylic acid-polystyrene block copolymer binder. According to the invention, the preparation process is simple,the polymerization conditions are mild, the molecular weight and composition regulation of the block copolymer are convenient, the performance is controllable, the prepared binder can be used for greatly enhancing the binding force between powder granules and a current collector and the binding force among the powder granules, and the problems of volume expansion and the like in charging and discharging processes of the battery when a silicon material is used as an active substance can be relieved. In addition, the binder has good electrical conductivity and low internal resistance and can beused for preparing the silicon-based negative electrode of the lithium battery, so that the lithium ion battery has excellent electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a preparation method of a silicon-based negative electrode binder for lithium batteries and related binders. Background technique [0002] The current energy crisis and environmental problems are increasingly prominent, making clean energy and energy storage a hot research topic. In recent years, people's demand for the performance of lithium-ion batteries is still growing, especially in the booming electric vehicle market in recent years, there is an urgent need for high-energy density and large-capacity power lithium batteries to increase the cruising range. [0003] Improving the energy density of lithium-ion batteries is a systematic project involving improvements in electrode materials, electrolyte materials, and battery structure design. Specific to electrode materials, it is necessary to develop new high-capacity positive and negative electrode materials with ex...

Claims

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Application Information

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IPC IPC(8): C09J153/00C09J11/04C09J9/02C08F293/00C08F220/18C08F212/08C08F220/14C08F2/26C08F2/28C08F2/30C08F2/38H01M4/38H01M4/62H01M10/052
CPCY02E60/10
Inventor 余方苗包永忠顾卓韦周昶吉
Owner ZHEJIANG CASNOVO MATERIALS
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