High-efficiency lithium-sulfur battery additive and application method thereof

A lithium-sulfur battery, electrolyte additive technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problem of lithium-sulfur battery capacity attenuation, reduce volume expansion, improve specific surface area and active material utilization, improve safety effect

Inactive Publication Date: 2017-02-22
CHONGQING IND POLYTECHNIC COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The theoretical specific energy density of lithium-sulfur batteries is 2600W h / kg, which is 4-5 times higher than that of conventional lithium-ion batteries. Capacity Fading of Lithium-Sulfur Batteries

Method used

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  • High-efficiency lithium-sulfur battery additive and application method thereof

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Embodiment 1

[0019] Embodiment one: the weight ratio of carbon composite material and electrolyte additive is 1:10; Carbon composite material is made up of following raw materials by weight: 60 parts of carbon material, 3 parts of acetylene black, SnO 5 parts of coated glass sheet, phenyl ring 1 part of hexane; The electrolyte additive is composed of the following raw materials in parts by weight: 1 part of lignosulfonate, 2 parts of humic acid, 5 parts of silicic acid, 2 parts of 2-vinylpyridine, ethoxylated pentafluorocyclic 2 parts of phosphazene, 3 parts of 1-ethyl-3-methylimidazolium tetrafluoroborate, 1 part of mesoporous silicate.

[0020] Such as figure 1 As shown, the specific capacity of the present invention decreases less after being charged for many times, and the service life is longer and the service life is longer.

Embodiment 2

[0021] Embodiment two: the weight ratio of carbon composite material and electrolyte additive is 1:12; Carbon composite material is made up of following raw materials in parts by weight: 70 parts of carbon material, 5 parts of acetylene black, SnO 2 parts of coated glass sheet, phenyl ring 2 parts of hexane; The electrolyte additive consists of the following raw materials in parts by weight: 2 parts of lignosulfonate, 3 parts of humic acid, 2 parts of silicic acid, 3 parts of 2-vinylpyridine, ethoxy pentafluorocyclo 5 parts of phosphazene, 1 part of 1-ethyl-3-methylimidazolium tetrafluoroborate, 2 parts of mesoporous silicate.

Embodiment 3

[0022] Embodiment 3: The weight ratio of carbon composite material and electrolyte additive is 1:15 The carbon composite material is made up of following raw materials in parts by weight: 80 parts of carbon material, 2 parts of acetylene black, SnO2 coated glass sheet 3 parts, phenylcyclohexane 3 parts of alkane; The electrolyte additive is composed of the following raw materials in parts by weight: 3 parts of lignosulfonate, 1 part of humic acid, 3 parts of silicic acid, 4 parts of 2-vinylpyridine, ethoxy pentafluorocyclic phosphorus 1 part of nitrile, 2 parts of 1-ethyl-3-methylimidazolium tetrafluoroborate, 3 parts of mesoporous silicate.

[0023] A method for using an additive for a high-efficiency lithium-sulfur battery, including a method for using a carbon composite material and an additive for an electrolyte solution. The method for using the carbon composite material is as follows: carbon materials, acetylene black, and SnO2 coated glass flakes are ball milled and pulv...

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Abstract

The invention relates to a high-efficiency lithium-sulfur battery additive which is characterized by comprising a carbon composite material and an electrolyte additive in a weight ratio of 1:(10-15). The composite material is composed of the following raw materials in parts by weight: 60-80 parts of carbon material, 2-5 parts of acetylene black, 2-5 parts of SnO2 coated glass sheet and 1-3 parts of phenylcyclohexane. The electrolyte additive is composed of the following raw materials in parts by weight: 1-3 parts of lignosulphonate, 1-3 parts of humic acid, 2-5 parts of silicic acid, 2-4 parts of 2-vinyl pyridine, 1-5 parts of ethoxypentafluorocyclophosphonitrile, 1-3 parts of 1-ethyl-3-methylimidazole tetrafluoborate and 1-3 parts of mesoporous silicate. Under the combined actions of the positive electrode material and electrolyte, the positive electrode material and electrolyte can have synergistic actions, thereby effectively reducing the generation of insoluble Li2S2 and Li2S; and a small amount of generated insoluble substances can prevent overcharging.

Description

technical field [0001] The invention belongs to the field of batteries, in particular to an additive for high-efficiency lithium-sulfur batteries and a method for using the same. Background technique [0002] The theoretical specific energy density of lithium-sulfur batteries is 2600W h / kg, which is 4-5 times higher than that of conventional lithium-ion batteries. Fading of lithium-sulfur battery capacity. Contents of the invention [0003] The invention provides a high-efficiency lithium-sulfur battery additive and its use method to solve the defects in the prior art. [0004] The present invention is achieved through the following technical solutions: [0005] A high-efficiency lithium-sulfur battery additive, including a carbon composite material and an electrolyte additive, the weight ratio of the carbon composite material and the electrolyte additive is 1:10-15; the carbon composite material is composed of the following raw materials in parts by weight: carbon mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567
CPCH01M10/0567Y02E60/10
Inventor 刘云霞
Owner CHONGQING IND POLYTECHNIC COLLEGE
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