Multi-block binder as well as preparation method and application thereof

A binder and multi-block technology, which is applied in the field of lithium-ion batteries, can solve the problems of silicon-based negative electrode sheet dropping, reducing the expansion rate of silicon-based negative electrode sheet, and low glass transition temperature of the binder.

Pending Publication Date: 2021-04-09
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The glass transition temperature of the binder is low, which solves the problem of silicon-based negative electrode sheet dropping during processing, effectively reduces the expansion rate of silicon-based negative electrode sheet, and improves the cycle performance of the battery

Method used

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  • Multi-block binder as well as preparation method and application thereof
  • Multi-block binder as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0071] This embodiment provides a multi-block binder, which uses polymethyl methacrylate-isooctyl acrylate-acrylamide as repeating units, has a molecular weight of 1.8 million, and a glass transition temperature of 75°C. In the multi-block binder, the mass fraction of methyl methacrylate is 50%, the mass fraction of isooctyl acrylate is 30%, and the mass fraction of acrylamide is 20%.

[0072] The preparation method of described binder comprises the following steps:

[0073] (1) Methyl methacrylate and isooctyl acrylate are mixed with water in a mass ratio of 5:3 to obtain a mixed solution;

[0074] (2) The mixed solution obtained in step (1) is placed in a 40°C water bath and stirred, and after the temperature is stabilized, dibenzoyl peroxide and chloroform are added thereto while stirring, and the dibenzoyl peroxide The mass percentages of acyl chloride and chloroform are both 0.1%, the stirring speed is 200rpm, and the reaction time is 4h to obtain the reaction solution; ...

Embodiment 2

[0077] This embodiment provides a multi-block binder, which uses polyacrylonitrile-isooctyl acrylate-acrylamide as repeating units, has a molecular weight of 1.6 million, and a glass transition temperature of 80°C. In the multi-block binder, the mass fraction of acrylonitrile is 35%, the mass fraction of isooctyl acrylate is 30%, and the mass fraction of acrylamide is 35%.

[0078] The preparation method of described binder comprises the following steps:

[0079] (1) acrylonitrile and isooctyl acrylate are mixed with water in a mass ratio of 3.5:3 to obtain a mixed solution;

[0080](2) The mixed solution obtained in step (1) is placed in a 55°C water bath and stirred, and after the temperature is stabilized, sodium lauryl sulfate and isopropanol are added thereto while stirring, the lauryl sulfate The mass percentages of sodium and isopropanol are 1% and 2.5% respectively, the stirring speed is 600rpm, the reaction time is 2.5h, and the reaction solution is obtained;

[008...

Embodiment 3

[0083] This embodiment provides a multi-block binder, which uses polymethyl methacrylate-butyl acrylate-acrylamide as repeating units, has a molecular weight of 1.9 million, and a glass transition temperature of 90°C. In the multi-block binder, the mass fraction of methyl methacrylate is 40%, the mass fraction of butyl acrylate is 20%, and the mass fraction of acrylamide is 40%.

[0084] The preparation method of described binder comprises the following steps:

[0085] (1) Methyl methacrylate and butyl acrylate are mixed with water in a mass ratio of 6:3 to obtain a mixed solution;

[0086] (2) The mixed solution obtained in step (1) is placed in a 70°C water bath and stirred, and after the temperature is stabilized, azobisisobutyronitrile and chloroform are added thereto while stirring, the azobisisobutyronitrile The mass percentages of nitrile and chloroform are respectively 2% and 5%, the speed of the stirring is 1000rpm, the reaction time is 1h, and the reaction solution ...

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Abstract

The invention relates to a multi-block binder as well as a preparation method and application thereof. The binder comprises a repeating unit formed by a first hard monomer, a soft monomer and a second hard monomer, and in the repeating unit, the soft monomer is respectively connected with the first hard monomer and the second hard monomer through chemical bonds; and the mass percentage content of the soft monomer is 20% or above based on 100% of the mass of the binder. According to the binder provided by the invention, the first hard monomer, the soft monomer and the second hard monomer are matched with one another to form the binder with a'hard monomer and soft monomer 'structure, so that the bonding strength of the binder is guaranteed, the flexibility of the binder is also guaranteed, and the problem of material falling of a pole piece of a silicon-based negative electrode system battery cell in a processing process is solved; silicon-based negative electrode expansion is effectively inhibited, and the cycle performance of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a multi-block binder and its preparation method and application. Background technique [0002] Lithium-ion batteries have become the main source of power for new energy vehicles due to their high energy density, long charge-discharge cycle life, and low environmental pollution during use. As consumers' demand for cruising range increases, the energy density of lithium-ion batteries needs to be further improved. At present, the positive electrode of lithium-ion batteries gradually adopts a high-nickel system, and the corresponding negative electrode adopts a silicon-based system. However, the volume expansion rate of silicon is as high as 300%, which will cause the structure of the active material to collapse during the charging and discharging process of the lithium-ion battery, thereby detaching from the current collector. In addition, the huge volume change will...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F293/00C08F2/38H01M4/38H01M4/62H01M10/0525
CPCC08F293/00C08F2/38H01M4/621H01M4/386H01M10/0525Y02E60/10
Inventor 陈亮刘建华刘金成
Owner EVE ENERGY CO LTD
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