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Preparation method for positive electrode material of graphene coated sulfur-lithium sulfur battery

A graphene-coated, lithium-sulfur battery technology, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problems of low utilization rate of positive electrode active materials, poor rate performance, short cycle life, etc., to improve battery life Chemical properties, high discharge specific capacity, and the effect of improving conductivity

Inactive Publication Date: 2016-07-27
周荣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention: Aiming at the problems of low utilization rate of positive electrode active material, poor rate performance and short cycle life of lithium-sulfur battery, the present invention provides a preparation method of graphene-coated sulfur-lithium-sulfur battery positive electrode material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] Take 30g of medium-temperature coal tar pitch whose softening point is 72°C, add 3g of nickel dichloride, stir and heat to 380°C, add a vertical magnetic field, react for 10 hours, cool to room temperature, add 50ml of quinoline solvent to dissolve, heat to 70°C and stir 2h, cooled to room temperature, filtered to obtain the filter residue, washed the filter residue 3 times with acetone, and dried in an oven at 100°C to obtain mesophase carbon microspheres; measure 90mL concentrated sulfuric acid with a mass fraction of 98%, 2.0g sodium nitrate and 3.0g Pour mesophase carbon microspheres into a beaker one by one, stir well, add 5.0g potassium permanganate, ice bath for 1h, heat to 30°C water bath, keep the temperature for 1h, add 80mL deionized water, heat to 95°C water bath for 15min , respectively add 300mL deionized water, 20mL mass fraction 30% hydrogen peroxide, let stand for 10min, filter with suction, and wash the filter residue with deionized water for 3 times, p...

example 2

[0021] Take 40g of medium-temperature coal tar pitch whose softening point is 72°C, add 4g of nickel dichloride, stir and heat to 400°C, add a vertical magnetic field, react for 11 hours, cool to room temperature, add 60ml of quinoline solvent to dissolve, heat to 70°C and stir 2.5h, cooled to room temperature, filtered to obtain filter residue, washed filter residue 4 times with acetone, dried in 105°C oven to obtain mesophase carbon microspheres; measure 91mL mass fraction 98% concentrated sulfuric acid, 2.5g sodium nitrate and 3.5 g mesophase carbon microspheres, pour them into a beaker in turn, stir well, add 5.5g potassium permanganate, ice bath for 1.5h, heat to 32°C water bath, keep the temperature for 1.5h, add 90mL deionized water, heat to 96 ℃ water bath for 18 minutes, add 350mL deionized water and 22mL 30% hydrogen peroxide respectively, let it stand for 15 minutes, filter with suction, and wash the filter residue with deionized water 4 times, put the filter residue i...

example 3

[0024] Take 60g of medium-temperature coal tar pitch material whose softening point is 72°C, add 5g of nickel dichloride, stir and heat to 430°C, add a vertical magnetic field, react for 12 hours, cool to room temperature, add 70ml of quinoline solvent to dissolve, heat to 70°C and stir 3h, cooled to room temperature, filtered to obtain the filter residue, washed the filter residue 5 times with acetone, and dried in an oven at 110°C to obtain mesophase carbon microspheres; measure 92mL concentrated sulfuric acid with a mass fraction of 98%, 3.0g sodium nitrate and 4.0g Mesophase carbon microspheres are poured into a beaker one by one, stirred evenly, add 6.0g potassium permanganate, ice bath for 2h, heat to 35°C water bath, keep the temperature for 2h, add 100mL deionized water, heat to 98°C water bath for 20min , add 400mL of deionized water, 25mL of 30% hydrogen peroxide, stand for 20min, filter with suction, and wash the filter residue with deionized water for 5 times, put t...

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Abstract

The invention relates to a preparation method for a positive electrode material of a graphene coated sulfur-lithium sulfur battery, and belongs to the field of a battery material. The preparation method comprises the following steps of taking intermediate-phase carbon microspheres as a raw material to prepare a conductive network and graphene with a large area to serve as a sulfur carrying substrate; taking sodium thiosulfate as a sulfur source, growing sulfur on the graphene in an in-situ way by a chemical deposition method, and preparing an activated graphene / sulfur composite material; and mixing and coating the activated graphene / sulfur composite material and polyvinylidene fluoride onto an aluminum foil to prepare a positive electrode plate. The graphene is provided with a unique two-dimensional porous network geometric structure having excellent conductivity, large specific area, chemical stability and high mechanical property, an electron and ion transmission path in the lithium sulfur battery can be shortened, and the electrochemical activity of elemental sulfur is improved; and generated soluble polysulfide lithium can be coated with a layered graphene structure at the periphery during circulation of charging and discharging and is limited in the electrode material, a shuttle effect can be further relieved, the columbic efficiency is improved, thus, the specific capacity of an electrode is improved, and the cycle lifetime of the battery is prolonged.

Description

technical field [0001] The invention relates to a preparation method of a graphene-coated sulfur-lithium-sulfur battery cathode material, belonging to the field of battery materials. Background technique [0002] Since the beginning of the 21st century, the United States, France, Russia and other countries have increased the development and utilization of renewable energy and new energy. Among them, secondary batteries, as an important part of energy storage devices in the field of new energy, have high energy conversion Efficiency has become a research hotspot in new energy. Among them, lithium secondary batteries have been widely used in portable electronic products, electric vehicles, aerospace vehicles and power grid transmission due to their advantages such as high specific energy, high charging efficiency, good temperature characteristics, low self-discharge, small charging thermal effect and no memory effect. widely used. The performance of a lithium battery is dete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/583H01M4/625H01M10/052Y02E60/10
Inventor 周荣王龙
Owner 周荣
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