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High-conductivity slurry for lithium-sulfur batteries, diaphragm based on high-conductivity slurry and application

A lithium-sulfur battery, high conductivity technology, applied in the direction of lithium batteries, conductive coatings, battery components, etc., can solve the problem of unable to suppress the shuttle effect, to avoid the shuttle effect, improve ion conductivity and lithium ion migration number, The effect of preventing polysulfides

Inactive Publication Date: 2019-12-10
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Another object of the present invention is to provide the high-conductivity slurry for lithium-sulfur batteries obtained by the above preparation method, which can solve the defect that traditional battery separators cannot suppress the shuttle effect, improve the surface polarity of the separator, and improve Its ability to absorb and retain liquid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for preparing a high-conductivity slurry for lithium-sulfur batteries, comprising the following steps:

[0028] 1) Mix water and ethanol, then add dispersant, stir for 2 minutes until uniform, and obtain the first mixed solution, wherein, in terms of parts by mass, the ratio of water, ethanol and dispersant is 3:1:0.01, and the dispersant is Ammonium polyacrylate;

[0029] 2) Mix the second mixed solution with the first mixed solution, stir with a mixer for 40 minutes until uniform, and then put it into a sand mill for 1 hour to obtain a high-conductivity slurry for lithium-sulfur batteries, wherein the second mixed solution is ammonia A mixture of lithium-conducting polymers, tannic acid, carbon-based conductors and pore-forming additives, in parts by mass, the ratio of ammonia-based lithium-conducting polymers, tannic acid, carbon-based conductors and pore-forming additives is 5:5 : 10: 0.6, the second mixed liquid is 5wt% of the first mixed liquid, the ammo...

Embodiment 2

[0033] A method for preparing a high-conductivity slurry for lithium-sulfur batteries, comprising the following steps:

[0034] 1) Mix water and ethanol, then add dispersant, stir for 2 minutes until uniform, and obtain the first mixed liquid, wherein, in terms of parts by mass, the ratio of water, ethanol and dispersant is 8:1:0.045, and the dispersant is Trimethylammonium hydrochloride;

[0035] 2) Mix the second mixed solution with the first mixed solution, stir with a mixer for 40 minutes until uniform, and then put it into a sand mill for 1 hour to obtain a high-conductivity slurry for lithium-sulfur batteries, wherein the second mixed solution is ammonia A mixture of lithium-conducting polymers, tannic acid, carbon-based conductors and pore-forming additives, in parts by mass, the ratio of ammonia-based lithium-conducting polymers, tannic acid, carbon-based conductors and pore-forming additives is 37:14 :34:6.8, the second mixed solution is 10wt% of the first mixed solu...

Embodiment 3

[0037] A method for preparing a high-conductivity slurry for lithium-sulfur batteries, comprising the following steps:

[0038] 1) Mix water and ethanol, then add dispersant, stir for 2 minutes until uniform, and obtain the first mixed solution, wherein, in terms of parts by mass, the ratio of water, ethanol and dispersant is 15:1:0.08, and the dispersant is polyethylene glycol;

[0039] 2) Mix the second mixed solution with the first mixed solution, stir with a mixer for 40 minutes until uniform, and then put it into a sand mill for 1 hour to obtain a high-conductivity slurry for lithium-sulfur batteries, wherein the second mixed solution is ammonia A mixture of lithium-conducting polymers, tannic acid, carbon-based conductors and pore-forming additives, in parts by mass, the ratio of ammonia-based lithium-conducting polymers, tannic acid, carbon-based conductors and pore-forming additives is 64:9 :30:3, the second mixed solution is 16wt% of the first mixed solution, the amm...

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Abstract

The invention discloses high-conductivity slurry for lithium-sulfur batteries, a diaphragm based on the high-conductivity slurry and an application. The preparation method of the high-conductivity slurry for lithium-sulfur batteries comprises the following steps: mixing water with ethanol, adding a dispersing agent, and stirring the substances well to obtain a first mixed solution; and mixing thefirst mixed solution with a second mixed solution, stirring the first mixed solution and the second mixed solution well and putting the first mixed solution and the second mixed solution in a sand mill for sand milling for 30-90min to obtain high-conductivity slurry for lithium-sulfur batteries, the second mixed solution being a mixture of an ammonia lithium-conducting polymer, tannic acid, a carbon conductor and a pore-forming additive. By introducing a functional layer to the surface of a polyolefin diaphragm, the generation of polysulfide is prevented, and the shuttle effect is avoided. Onthe other hand, the introduction of the functional layer can improve the polarity of the surface of the diaphragm so as to improve the electrolyte wettability of the diaphragm, and can promote the migration of lithium ions, improve the ionic conductivity of the diaphragm and the number of lithium ions migrated and finally improve the cycle performance and rate performance of batteries.

Description

technical field [0001] The invention belongs to the technical field of battery separators, and in particular relates to a high-conductivity slurry for lithium-sulfur batteries, a separator based on the same and its application. Background technique [0002] The lithium-sulfur battery is a battery composed of sulfur as the positive electrode (cathode cathode) and lithium metal as the negative electrode (anode anode). Its theoretical specific capacity is 1675mAh / g, and its theoretical specific energy is 2600Wh / kg. Due to the poor conductivity of positive electrode sulfur, it cannot be used directly as a positive electrode. Generally speaking, it is mixed with a conductive agent to increase its conductivity. The conductive agent is generally Super P, alkyne black, etc., and the dosage varies from 10% to 50%. . During the discharge process, the positive electrode sulfur will become a polysulfide compound dissolved in the electrolyte. The polysulfide compound will pass through t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M10/052C09D5/24
CPCC09D5/24H01M10/052H01M50/411H01M50/449Y02E60/10
Inventor 袁海朝徐锋苏柳苏碧海
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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