Preparation method of polyvinylidene fluoride-hexafluoropropylene diaphragm

A technology of polyvinylidene fluoride and hexafluoropropylene, applied in electrolytic coating, electrophoretic plating, coating, etc., can solve the problems of difficult control of diaphragm pore distribution, uneven current distribution, and uneven pore distribution, etc., to improve industrial Production efficiency, production efficiency improvement, uniform pore distribution effect

Active Publication Date: 2016-12-14
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: 1, it is carried out at high temperature, the condition requirement is higher, and consumes energy; The environment is not beneficial; 4. The pore distribution of the separator is not easy to control, and the pore distribution is uneven, resulting in uneven distribution of current, which eventually leads to the formation of dendrite lithium or dead lithium

Method used

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  • Preparation method of polyvinylidene fluoride-hexafluoropropylene diaphragm
  • Preparation method of polyvinylidene fluoride-hexafluoropropylene diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In this example, the figure 1 and figure 2 The shown setup is used for electrolyte preparation and performing electrophoresis.

[0032] S1: Raw materials: weigh polyvinylidene fluoride-hexafluoropropylene powder and solid iodine at a mass ratio of 40:1

[0033] Solvent: appropriate amount of acetone;

[0034] S2: Add polyvinylidene fluoride-hexafluoropropylene powder and acetone into the round bottom flask 2, place the round bottom flask 2 in the magnetic stirring water bath 1, when the temperature of the water bath is about 30°C, the stirring time is about 8- 10min, until the polyvinylidene fluoride-hexafluoropropylene powder is uniformly dispersed in acetone;

[0035] S3: Add weighed solid iodine into the round bottom flask 2, when the temperature of the water bath is about 15°C, stir for about 15-20min until the solid iodine dissolves in acetone to prepare an electrolyte;

[0036]S4: Pour the electrolyte solution into the electrophoresis tank 6, insert the graph...

Embodiment 2

[0038] In this example, the figure 1 and figure 2 The shown setup is used for electrolyte preparation and performing electrophoresis.

[0039] S1: Raw materials: weigh polyvinylidene fluoride-hexafluoropropylene powder and solid iodine at a mass ratio of 45:1

[0040] Solvent: appropriate amount of acetone;

[0041] S2: Add polyvinylidene fluoride-hexafluoropropylene powder and acetone into the round bottom flask 2, place the round bottom flask 2 in the magnetic stirring water bath 1, when the temperature of the water bath is about 40°C, the stirring time is about 6- 8min until the polyvinylidene fluoride-hexafluoropropylene powder is uniformly dispersed in acetone;

[0042] S3: Add weighed solid iodine into the round bottom flask 2, when the temperature of the water bath is about 20°C, stir for about 12-17min until the solid iodine dissolves in acetone to prepare an electrolyte;

[0043] S4: Pour the electrolyte solution into the electrophoresis tank 6, insert the graphi...

Embodiment 3

[0045] In this example, the figure 1 and figure 2 The shown setup is used for electrolyte preparation and performing electrophoresis.

[0046] S1: Raw materials: weigh polyvinylidene fluoride-hexafluoropropylene powder and solid iodine at a mass ratio of 55:1

[0047] Solvent: appropriate amount of acetone;

[0048] S2: Add polyvinylidene fluoride-hexafluoropropylene powder and acetone into the round bottom flask 2, place the round bottom flask 2 in the magnetic stirring water bath 1, when the temperature of the water bath is about 50°C, the stirring time is about 4- 6min until the polyvinylidene fluoride-hexafluoropropylene powder is uniformly dispersed in acetone;

[0049] S3: Add weighed solid iodine into the round bottom flask 2, when the temperature of the water bath is about 25°C, stir for about 9-14min until the solid iodine dissolves in acetone to prepare an electrolyte;

[0050] S4: Pour the electrolyte solution into the electrophoresis tank 6, insert the graphit...

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Abstract

The invention discloses a preparation method of a polyvinylidene fluoride-hexafluoropropylene diaphragm. The preparation method comprises the following steps that (S1) the following materials are weighed in proportion: polyvinylidene fluoride-hexafluoropropylene powder, solid iodine and acetone; (S2) the polyvinylidene fluoride-hexafluoropropylene powder and the acetone are added in a reaction container; and the reaction container is put in a water bath with a certain temperature for stirring until the polyvinylidene fluoride-hexafluoropropylene powder is uniformly dispersed in the acetone; (S3) the weighed solid iodine is added in the reaction container for continuous stirring in the water bath with a certain temperature until the solid iodine is dissolved in the acetone to prepare electrolyte; and (S4) two electrode chips are inserted in the electrolyte for electrolysis to obtain the polyvinylidene fluoride-hexafluoropropylene diaphragm. The polyvinylidene fluoride-hexafluoropropylene diaphragm prepared through the method is uniform in porosity distribution; and the preparation process is simple, easy to operate, short in preparation time, high in efficiency and suitable for industrial production and application.

Description

technical field [0001] The invention belongs to the technical field of lithium battery materials, and in particular relates to a preparation method of a polyvinylidene fluoride-hexafluoropropylene diaphragm. Background technique [0002] Polymer lithium-ion batteries have gradually attracted more and more researchers' interest. Compared with the currently widely used liquid lithium-ion batteries, polymer lithium-ion batteries have the advantages of thinner shape, arbitrary area and arbitrary shape. The lithium polymer battery using aluminum-plastic composite film as the shell can achieve a higher specific capacity, and the mass specific energy of the polymer lithium ion battery can be increased by more than 20% compared with the current liquid lithium ion battery; the polymer lithium ion battery also has The characteristics of miniaturization, thinning and light weight can meet the needs of miniaturization, light weight and flexibility of new electronic equipment. Therefor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D13/06H01M2/14H01M2/16
CPCC25D13/04H01M50/403H01M50/411Y02E60/10
Inventor 何伟东叶露涵张作翔石星逸朱高龙邹敏达韩玉培
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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