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Preparation method for anode material of lithium sulphur battery

A positive electrode material, lithium-sulfur battery technology, applied in the direction of battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of limited ability to adsorb active substance sulfur, poor conductivity, etc., and achieve the effect of avoiding oxidation

Active Publication Date: 2014-08-13
山东卓海能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The present invention aims at the application of the porous carbon and sulfur composite positive electrode material in the prior art, which has limited ability to adsorb active substance sulfur and poor conductivity, so that its application in batteries is limited. Lithium-sulfur battery cathode material with high energy rate performance and high cycle performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In a 1L 316L stainless steel reaction kettle, under the protection of continuously feeding 360ml / min nitrogen, add 5.4mol NMP, 1.0mol sodium hydrosulfide and 1.003mol sodium hydroxide, and slowly stir the reaction system under the condition of 160~190rpm The temperature of the reaction system was raised to 86°C, and at the same time, 0.4mol of deionized oxygen-free water was added, and then 1.001mol of lithium chloride was added, and the temperature of the reaction system was continuously raised to 170°C, and at this temperature, the reaction system was kept warm for 33min. When fine white crystals are precipitated in the reaction system, evaporate and remove the water in the reaction system at the same time, and stop heating; under the protection of nitrogen, filter while hot, filter out the white crystals in the reaction system, and add the filtrate again For the reaction system, the stirring intensity of the reactor is 330rpm; add the sublimated sulfur and deionized o...

Embodiment 2

[0041] In a 1L 316L stainless steel reaction kettle, under the protection of continuously feeding 480ml / min nitrogen, add 8.8mol NMP, 1.0mol sodium hydrosulfide and 1.003mol sodium hydroxide, and slowly lower the temperature of the reaction system under the condition of stirring at 190rpm Raise to 88°C, add 0.4mol deionized oxygen-free water at the same time, then add 1.001mol lithium chloride, continue to raise the temperature of the reaction system to 190°C, and keep the reaction system warm for 18min at this temperature until the reaction When fine white crystals are precipitated in the system, evaporate and remove the water in the reaction system at the same time, and stop heating; under the protection of nitrogen, filter while it is hot, filter out the white crystals in the reaction system, and add the filtrate to the reaction system again , the stirring intensity of the reaction kettle is 330rpm; add the sublimated sulfur and deionized oxygen-free water in the formula, wa...

Embodiment 3

[0044]In a 1L 316L stainless steel reaction kettle, under the protection of continuously feeding 373ml / min nitrogen, add 5.9mol NMP, 1.0mol sodium hydrosulfide and 1.003mol sodium hydroxide, and slowly lower the temperature of the reaction system under the stirring condition of 171rpm Raise to 87°C, add 0.4mol deionized oxygen-free water at the same time, then add 1.001mol lithium chloride, continue to increase the temperature of the reaction system to 173°C, and keep the reaction system warm for 21min at this temperature until the reaction When fine white crystals are precipitated in the system, evaporate and remove the water in the reaction system at the same time, and stop heating; under the protection of nitrogen, filter while it is hot, filter out the white crystals in the reaction system, and add the filtrate to the reaction system again , the stirring intensity of the reactor is 291rpm; add the sublimated sulfur and deionized oxygen-free water in the formula, wait for th...

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Abstract

The invention discloses a preparation method for an anode material of a lithium sulphur battery. The preparation method comprises the following steps: mixing polyacrylonitrile resin micropowder and kieselguhr as a mass ratio of (38-41) to (62-59), putting the mixture into a high temperature furnace through nitrogen replacement after pre-processing, and in a condition of proper vacuumizing, enabling lumpy mucilage mud to turn into lumpy kieselguhr which only contains a silicon carbide element; dissolving lithium polysulfide in an NMP (N-methylpyrrolidone) solution which contains 28-33% by weight of lithium polysulfide, soaking for 33-38 minutes, after taking out, and putting the lumpy kieselguhr which contains the lithium polysulfide and the NMP solvent into another high temperature furnace through nitrogen replacement, so that the anode material of the lithium sulphur battery which contains 18-21% by weight of lithium polysulfide through dipping and steaming at high temperature for many times. The manufacturing method for the anode material of the lithium sulphur battery, which is disclosed by the invention, is simple in preparation and low in cost; the prepared anode material of the lithium sulphur battery has high sulphur accommodation ability and relatively high ion transmission ability and conductivity, and the high rate performance and high cycle performance of the lithium sulphur battery can be improved.

Description

[0001] Field [0002] The invention relates to a lithium-sulfur battery cathode material and a preparation method thereof, belonging to the field of new energy. Background technique [0003] With the development of human society, problems such as energy shortage and environmental pollution have become increasingly prominent, and people's understanding and requirements for chemical power sources have become higher and higher, prompting people to continuously explore new energy storage systems based on chemical power sources. Lithium metal-based batteries have led the development of high-performance chemical power sources in recent decades. With the successful commercialization of lithium-ion batteries, countries around the world are stepping up research on lithium-ion power batteries for vehicles. However, due to factors such as energy density, safety, and price, conventional lithium-ion batteries such as lithium cobalt oxide, lithium manganese oxide, and lithium iron phosphat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62
CPCH01M4/5815H01M4/624H01M10/052Y02E60/10
Inventor 宋大余徐晨李波
Owner 山东卓海能源科技有限公司