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High-lithium-content and high-molecular-weight lithium acrylate emulsion as well as preparation method and application thereof

A technology of lithium acrylate and lithium polyacrylate, applied in the field of electrochemistry, can solve the problems of large amount of binder, easy powder drop, poor processing performance, etc. The effect of resistance drop

Pending Publication Date: 2022-06-03
瑞红锂电池材料(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, the solution-type lithium polyacrylate has high viscosity and extremely poor processing performance, and the pole pieces made are relatively brittle, easy to drop powder and basically unusable.
And according to the molecular weight of the conventional emulsion type lithium polyacrylate prepared according to the present technology level is very low (generally can only reach 3~70,000), and lithium content is very low (generally can only reach 0.05~0.15%), so, bonding The strength is poor, the amount of binder used is large, and it cannot effectively perform various functions such as improving the first effect of the lithium battery, reducing the lithium analysis window, and increasing the cycle capacity.

Method used

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  • High-lithium-content and high-molecular-weight lithium acrylate emulsion as well as preparation method and application thereof
  • High-lithium-content and high-molecular-weight lithium acrylate emulsion as well as preparation method and application thereof
  • High-lithium-content and high-molecular-weight lithium acrylate emulsion as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This example provides a preparation method of lithium acrylate emulsion, comprising the following steps:

[0039] The first step: add 20% of the mixed monomer and 15% of the initiator azobisisobutyronitrile (dissolved in the organic solvent and then added) to the organic solvent at 65°C, react for 3h, and control the temperature at 65-70°C , add the remaining monomers and initiator dropwise, the dropping time is 18-20h; add the cross-linking monomer when the remaining 1 / 8 of the mixed monomer is added dropwise.

[0040] The second step: the isopropanol in the solvent-based acrylate resin is distilled off under reduced pressure, and an aqueous solution of lithium hydroxide (10wt%) is added dropwise to it to make it phase inversion into an oil-in-water emulsion, and the distillation temperature is about 55- 60 degrees Celsius, the total time of the second step is about 3 hours, and the addition amount of the lithium hydroxide aqueous solution is 500 parts by weight.

[0...

Embodiment 2

[0043] This example provides a preparation method of lithium acrylate emulsion, comprising the following steps:

[0044] The first step: add 30% of the mixed monomer and 15% of the initiator azobisisobutyronitrile (dissolved in the organic solvent and then added) to the organic solvent at 65°C, react for 3h, and control the temperature at 65-70°C , add the remaining monomers and initiator dropwise, the dropping time is 10-12h; add the cross-linking monomer when the remaining 1 / 8 mixed monomer is added dropwise.

[0045] The second step: the organic solvent in the solvent-based acrylate resin is distilled off under reduced pressure, and an aqueous solution of lithium hydroxide (10wt%) is added dropwise to it to make it phase inversion into an oil-in-water emulsion, and the distillation temperature is about 55-60 °C. Celsius, the total time of the second step is about 3 hours, and the addition amount of the lithium hydroxide aqueous solution is 500 parts by weight.

[0046] See...

Embodiment 3

[0048] This example provides a preparation method of lithium acrylate emulsion, comprising the following steps:

[0049] The first step: add 10% of the mixed monomer and 15% of the initiator azobisisobutyronitrile (dissolved in the organic solvent and then added) to the organic solvent at 65°C, react for 3h, and control the temperature at 65-70°C , add the remaining monomers and initiator dropwise, the dropping time is 20-22h; add the cross-linking monomer when the remaining 1 / 8 of the mixed monomer is added dropwise.

[0050] The second step: the organic solvent in the solvent-based acrylate resin is distilled off under reduced pressure, and an aqueous solution of lithium hydroxide (10wt%) is added dropwise to it to make it phase inversion into an oil-in-water emulsion, and the distillation temperature is about 55-60 °C. Celsius, the total time of the second step is about 2-5 hours, and the addition amount of the lithium hydroxide aqueous solution is 600 parts by weight.

[...

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Abstract

The invention discloses a high-lithium-content high-molecular-weight lithium acrylate emulsion and a preparation method and application thereof in a lithium battery, and the method comprises the following steps: carrying out polymerization reaction on a polymer monomer in an organic solvent in the presence of an initiator to obtain solvent-type acrylate resin, wherein the composition of the polymer monomer is controlled such that the theoretical glass transition temperature of the solvent-based acrylate resin is-12 DEG C to 25 DEG C; and removing the organic solvent in the solvent-type acrylate resin, and adding a lithium hydroxide aqueous solution into the solvent-type acrylate resin at the same time, so as to obtain the lithium acrylate emulsion. The lithium content of the lithium acrylate emulsion can reach 5%, the molecular weight can reach 500,000, and the electrochemical performance of a lithium battery can be remarkably improved.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a battery binder, a preparation method thereof and its application in lithium batteries. Background technique [0002] Electrode binder is one of the important auxiliary functional materials and essential materials in lithium ion batteries. Although the content in the electrode is small (usually 1.5% to 3%), it is the main source of the mechanical properties of the whole electrode. , has an important impact on the production process of the electrode and the electrochemical performance of the battery, and has an irreplaceable role. The main function of the battery binder is to bond the active material, the conductive agent and the current collector together to shorten the lithium ion transport pathway and stabilize the structure of the electrode material. Different binders will directly affect the specific capacity and Coulomb efficiency of the battery. and electrochem...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F220/18C08F212/36C08F222/14C08F230/08H01M4/62H01M10/0525
CPCC08F220/06H01M4/622H01M10/0525C08F220/1808C08F220/1812C08F220/1804C08F212/36C08F222/102C08F230/085Y02E60/10
Inventor 尚秀军朱生文吴国华
Owner 瑞红锂电池材料(苏州)有限公司
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