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Method for preparing lithium-sulfide ion battery modified diaphragm

A technology of sulfide ions and diaphragms, which is applied to battery components, circuits, electrical components, etc., can solve problems such as increasing battery resistance and polarization, affecting battery cycle performance, and material structure collapse, achieving improved shuttle effect, Effects of improving high-rate performance and increasing liquid retention capacity

Inactive Publication Date: 2019-04-05
ZHEJIANG FOREVER NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium-sulfur batteries are facing a series of problems at this stage: 1. Elemental sulfur and discharge product Li 2 S 2 / Li 2 S is an electronic and ion insulator, which increases the battery resistance and polarization; 2. The volume expansion of the positive electrode material during the discharge process causes the material structure to collapse and affects the cycle performance of the battery; The soluble polysulfides, due to the migration and reaction between the positive and negative electrodes due to diffusion, the "shuttle effect" of polysulfides occurs, resulting in the irreversible loss of active materials

Method used

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  • Method for preparing lithium-sulfide ion battery modified diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Select the substrate PP film of the diaphragm, and prepare the corresponding mixed solution according to the molar ratio of sodium carbonate, sodium bicarbonate, sodium dihydrogen phosphate and sodium dodecylsulfonate as 1:1:1:1. The selected PP film was soaked in the mixed solution at 40°C for 0.5h, and then placed in the hydrochloric acid solution mixed with metal salts of tin chloride and palladium chloride (the molar ratio of the two was 1:2) for 0.5 h. h, and controlling the temperature of the solution to be 40°C, which can improve the sensitization and activation effect of the PP film, and finally wash with deionized water, and vacuum-dry the above-mentioned pretreated PP film in an oven at 85°C;

[0024] Take a 10% Nafion (perfluorosulfonic acid) solution and dispersant hydroxyethyl cellulose, add an appropriate amount of isopropanol and deionized water (volume ratio 1:1) to stir well, and then add an appropriate amount of Super P, to obtain the corresponding con...

Embodiment 2

[0030]Select the base material Nafion film of the diaphragm, and prepare the corresponding mixed solution according to the molar ratio of sodium carbonate, sodium bicarbonate, sodium dihydrogen phosphate and sodium dodecylsulfonate as 1:0.5:1:2.0. The selected Nafion membrane is soaked in the mixed solution at a temperature of 35°C for 1.0h, and then placed in a hydrochloric acid solution mixed with metal salts of tin chloride and palladium chloride (the molar ratio of the two is 1:1.5) Soaking treatment for 1.0h, and controlling the temperature of the hydrochloric acid solution mixed with the metal salt to 20°C, the sensitization and activation effect of the Nafion membrane can be improved through the above-mentioned roughening and soaking treatment, and finally after washing with deionized water, the above pre-treatment The treated Nafion film was vacuum-dried in an oven at 85°C;

[0031] Take a 10% Nafion (perfluorosulfonic acid) solution and a dispersant sodium alginate fo...

Embodiment 3

[0037] Select the cellulose diaphragm as the base material of the diaphragm, soak it in acetone at a temperature of 25°C for 2.0 hours, then wash it with deionized water until neutral, and then place it in potassium chloride and chlorine at a temperature of 100°C Palladium chloride (the molar ratio of the two is 1:1.6) metal salt mixed hydrochloric acid solution for 3.0h, can improve the sensitization and activation effect of the cellulose diaphragm, after finally washing with deionized water, the The processed cellulose septum is vacuum-dried in an oven at 85°C;

[0038] Take a 5% polyvinylidene fluoride solution binder, add an appropriate amount of NMP, stir well, then add an appropriate amount of carbon nanotubes to obtain a corresponding conductive paste, and finally make the polyvinylidene fluoride in the conductive paste The solid content of the carbon nanotube is 1.0%, and the solid content of the carbon nanotube is 40%.

[0039] Coat the above-mentioned conductive pas...

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Abstract

The invention relates to a method for preparing a lithium-sulfide ion battery modified diaphragm and belongs to the technical field of batteries. In order to solve the shuttle effect of the lithium-sulfur battery and improve the cycle performance of the battery, the method for preparing the lithium-sulfide ion battery modified diaphragm is provided, which comprises roughening the surface of the base film of the diaphragm; then immersing the base film in a hydrochloric acid solution of metal chloride; drying the base film to obtain the corresponding preprocessed base film; dissolving a dispersant and a binder in a corresponding solvent, and then adding a conductive agent so as to obtain conductive paste having the conductive agent with a solid content of 0.5% to 40%; coating the single sideor both sides of the preprocessed base film with the conductive paste to form a conductive coating; and drying the conductive coating to obtain the corresponding lithium-sulfide ion battery modifieddiaphragm. The method has a good liquid retention capacity and a good liquid absorption capacity, reduce contact resistance, reduce the internal resistance of the battery using the battery diaphragm and improve the stability of the high rate of the battery.

Description

technical field [0001] The invention relates to a preparation method of a modified diaphragm of a lithium-sulfur ion battery, belonging to the technical field of batteries. Background technique [0002] Lithium-sulfur battery is a kind of lithium battery with sulfur element as the positive electrode of the battery, and the theoretical discharge specific capacity of elemental sulfur can reach 1675mAh / g, which is much higher than that of lithium-ion batteries widely used in commerce. Therefore, the sulfur cathode active material is currently the cathode material with the highest specific capacity, and lithium has the smallest relative atomic mass and the most negative standard electrode potential among metal elements. Therefore, lithium-sulfur batteries have high theoretical discharge voltage, high theoretical discharge specific capacity, and high theoretical specific energy, which are expected to meet the long-term development requirements of electric vehicles, and are a very...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/411H01M50/431H01M50/44H01M50/457
CPCH01M50/403H01M50/449Y02E60/10
Inventor 张芳芳赵亚郭恒志刘雷陈怀胜
Owner ZHEJIANG FOREVER NEW ENERGY TECH CO LTD
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