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Preparation method of modified polyvinylidene fluoride in lithium ion battery

A polyvinylidene fluoride and lithium-ion battery technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of discharge specific capacity attenuation, weak van der Waals force, and electrode particles are easy to fall off, so as to improve the wetting effect and increase Adhesive effect, the effect of enhancing the adhesive effect

Active Publication Date: 2021-08-06
山东天瀚新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyvinylidene fluoride and electrode materials have a weak van der Waals force, which makes the electrode particles easy to fall off, which leads to the decline of discharge specific capacity.

Method used

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  • Preparation method of modified polyvinylidene fluoride in lithium ion battery

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Effect test

Embodiment 1

[0016] A preparation method for modified polyvinylidene fluoride in lithium ion batteries, specifically comprising the following steps:

[0017] S1: Add graphene oxide into N,N-dimethylformamide, ultrasonically disperse, then add itaconic acid and azobisisobutyronitrile, heat to 60°C under nitrogen atmosphere, and react with magnetic stirring for 6h. After cooling, filter and dry; wherein the mass ratio of graphene oxide, itaconic acid and azobisisobutyronitrile is 1:0.46:0.24.

[0018] S2: Add the modified graphene oxide obtained in step S1 to N,N-dimethylacetamide, then sonicate for 5 hours, then add tin dichloride to raise the temperature to 60°C and stir for 2 hours, then add polyvinylidene fluoride and polyvinylpyrrolidone, continue to magnetically stir at this temperature for 10h, then cool, put into a ball mill after vacuum drying, and grind for 2h to obtain the binder; wherein modified graphene oxide, N,N-dimethylacetamide The mass-volume ratio of neutralized tin dich...

Embodiment 2

[0020] A preparation method for modified polyvinylidene fluoride in lithium ion batteries, specifically comprising the following steps:

[0021] S1: Add graphene oxide into N,N-dimethylformamide, ultrasonically disperse, then add itaconic acid and azobisisobutyronitrile, heat to 70°C under nitrogen atmosphere, and react with magnetic stirring for 10h. After cooling, filter and dry; wherein the mass ratio of graphene oxide, itaconic acid and azobisisobutyronitrile is 2:0.66:0.39.

[0022] S2: Add the modified graphene oxide obtained in step S1 to N,N-dimethylacetamide, then sonicate for 8 hours, then add tin dichloride to raise the temperature to 70°C and stir for 3 hours, then add polyvinylidene fluoride and polyvinylpyrrolidone, continue to magnetically stir at this temperature for 16 hours, then cool, put into a ball mill after vacuum drying, and grind for 3 hours to obtain the binder; wherein modified graphene oxide, N,N-dimethylacetamide The mass-volume ratio of neutraliz...

Embodiment 3

[0024] A preparation method for modified polyvinylidene fluoride in lithium ion batteries, specifically comprising the following steps:

[0025] S1: Add graphene oxide into N,N-dimethylformamide, ultrasonically disperse, then add itaconic acid and azobisisobutyronitrile, heat to 65°C under nitrogen atmosphere, and react with magnetic stirring for 8h. After cooling, filter and dry; wherein the mass ratio of graphene oxide, itaconic acid and azobisisobutyronitrile is 1.3:0.54:0.29.

[0026] S2: Add the modified graphene oxide obtained in step S1 to N,N-dimethylacetamide, then sonicate for 7 hours, then add tin dichloride to raise the temperature to 65°C and stir for 2.5 hours, then add polyvinylidene fluoride Ethylene and polyvinylpyrrolidone, continue to magnetically stir at this temperature for 12 hours, then cool, put into a ball mill after vacuum drying, and grind for 2.5 hours to obtain the binder; wherein modified graphene oxide, N,N-dimethyl The mass volume ratio of acet...

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Abstract

The invention discloses a preparation method of modified polyvinylidene fluoride in a lithium ion battery. The method comprises the following steps: S1, adding graphene oxide into N, N-dimethylformamide, carrying out ultrasonic dispersion, then adding itaconic acid and azodiisobutyronitrile, heating to 60-70 DEG C in a nitrogen atmosphere, carrying out magnetic stirring reaction for 6-10 hours, cooling, filtering, and drying; and S2, adding the modified graphene oxide obtained in the step S1 into N, N-dimethylacetamide, then carrying out ultrasonic treatment for 5-8 hours, then adding tin dichloride, raising the temperature to 60-70 DEG C, stirring for 2-3 hours, then adding polyvinylidene fluoride and polyvinylpyrrolidone, continuously carrying out magnetic stirring for 10-16 hours at the temperature, cooling, carrying out vacuum drying, then putting into a ball mill, and grinding for 2-3 hours to obtain the adhesive.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method for modified polyvinylidene fluoride used in lithium ion batteries. Background technique [0002] Lithium-ion batteries have been widely used in various digital electronic products due to their outstanding advantages such as high energy density, light weight, stable working voltage, long cycle life, high safety performance, and low environmental pollution. The electrodes of the lithium-ion battery are formed by coating the positive and negative electrode materials with a binder on the surface of the current collector. Therefore, the material used as a binder must have the following main characteristics: 1) Make the active materials bond to each other and bond to the current collector; 2) Electrochemical stability, no reaction and mutual solubility with the electrolyte; 3) Less dosage There is sufficient bonding strength, and the coa...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525C08F122/02C08F2/44
CPCH01M4/623H01M10/0525C08F122/02C08F2/44Y02E60/10
Inventor 兰晓春
Owner 山东天瀚新能源科技有限公司
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