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Sulfur/iron oxide/graphene battery cathode material, preparation method and lithium sulfur battery

A battery cathode and graphene technology, applied in the field of nanomaterials, can solve the problems of poor cycle stability and safety performance, short service life of lithium-sulfur batteries, and inability to effectively fix elemental sulfur, so as to improve capacity stability and service life, The effect of improving electrical conductivity and improving electrochemical performance

Inactive Publication Date: 2019-01-04
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention provides a sulfur / iron oxide / graphene battery positive electrode material, a preparation method and a lithium-sulfur battery, which solves the problem that polysulfides are easily produced when elemental sulfur is used as a lithium-sulfur battery positive electrode material in the prior art. , and elemental sulfur cannot be effectively fixed, which leads to the technical problems of short service life, poor conductivity, cycle stability and safety performance of lithium-sulfur batteries

Method used

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  • Sulfur/iron oxide/graphene battery cathode material, preparation method and lithium sulfur battery
  • Sulfur/iron oxide/graphene battery cathode material, preparation method and lithium sulfur battery
  • Sulfur/iron oxide/graphene battery cathode material, preparation method and lithium sulfur battery

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Embodiment 1

[0042] Preparation of nitrogen-doped graphene: Measure 400ml of 1.0mg / ml graphene oxide aqueous solution and place it in a 500ml three-necked flask, then add 16ml of 50wt% cyanamide aqueous solution, stir well, react at 90°C for 36h, and the obtained After natural cooling, the product was subjected to suction filtration, freezing, and freeze-drying to obtain nitrogen-doped graphene with active sites.

[0043] Preparation of graphene-iron oxide nanocomposites: Weigh 75 mg of the above-mentioned nitrogen-doped graphene, add it to 480 ml of ethanol for ultrasonic dispersion, and then take 0.75 mmol of FeCl 3 , dissolved in 10ml of absolute ethanol, and added to the dispersed graphene solution to obtain a uniform dispersion of iron salt and nitrogen-doped graphene, then add 8ml of deionized water, and transfer the dispersion to the reactor In the process, the hydrothermal reaction was carried out at a temperature of 90° C. for 6 hours. After the reaction, the product was naturally...

Embodiment 2

[0052] Preparation of nitrogen-doped graphene: Weigh 200mg of graphene oxide and place it in a 500ml three-necked flask, add 400ml of deionized water, then add 10mg of urea, stir to dissolve and disperse, react at 100°C for 30h, and the product obtained after the reaction is cooled naturally , carry out suction filtration, freezing, and freeze-drying to prepare nitrogen-doped graphene.

[0053] Preparation of graphene-iron oxide nanocomposite material: take 75mg of nitrogen-doped graphene, add it into 480ml of acetone for ultrasonic dispersion, then take 3.0mmol of ferrous chloride (FeCl 2 ), dissolved in 10ml of absolute ethanol, added to the dispersed graphene solution to obtain a uniform dispersion of iron salt and nitrogen-doped graphene, then add 16ml of deionized water, and transfer the dispersion to the reaction In the kettle, heat preservation at a temperature of 100° C. for 4 hours to carry out hydrothermal reaction. After the reaction, the product is naturally cooled...

Embodiment 3

[0056] Preparation of nitrogen-doped graphene: Measure 20ml of 10mg / ml graphene oxide aqueous solution and place it in a 500ml beaker, add 380ml of deionized water, stir evenly, then add 16ml of 50wt% cyanamide, transfer to a three-necked flask, React at 90°C for 24 hours, and the product obtained after the reaction is naturally cooled, then subjected to suction filtration, freezing, and freeze-drying to obtain nitrogen-doped graphene.

[0057] Prepare graphene-iron oxide nanocomposite material: take 75mg nitrogen-doped graphene, join in the ethanol of 470ml and ultrasonically disperse, then get 4.5mmol of ferric nitrate (Fe(NO 3 ) 3 ), dissolved in 20ml of absolute ethanol, added to the dispersed graphene solution to obtain a uniform dispersion of iron salt and nitrogen-doped graphene, then add 10ml of deionized water, and transfer the dispersion to the reaction In the kettle, the temperature is 120°C, the holding time is 2h, and the hydrothermal reaction is carried out. Aft...

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Abstract

The invention relates to the technical field of nanometer materials, in particular to a sulfur / iron oxide / graphene battery cathode material, a preparation method and a lithium sulfur battery. The invention discloses a preparation method of a sulfur / iron oxide / graphene battery cathode material, comprising the following steps: step 1, the nitrogen doped graphene and the ferric salt solution are hydrothermally reacted to obtain graphene-iron oxide nanocomposites; Step 2: the sulfur / iron oxide / graphene battery cathode material is prepared by vacuum melt diffusion reaction from the mixture of graphene-iron oxide nanocomposite and elemental sulfur. The invention also discloses a sulfur / iron oxide / graphene battery cathode material prepared by the abovementioned method and a lithium sulfur batterythereof. The invention solves the technical problems that the elemental sulfur in the prior art cannot be effectively utilized in the lithium sulfur battery cathode material, thereby leading to shortservice life, and poor conductivity, cycle stability and safety performance of the lithium sulfur battery.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a sulfur / iron oxide / graphene battery cathode material, a preparation method and a lithium-sulfur battery. Background technique [0002] With the rapid development of new energy technology, especially the technological progress of mobile electronic products and electric vehicles, new energy storage batteries with high specific energy, long cycle life and low cost have become an important research and development direction. Lithium-ion battery is currently the most widely used and most successful battery system, but limited by the specific capacity of the positive electrode material, it is difficult to increase the specific capacity of the positive electrode material of the lithium-ion battery under the condition of ensuring the safe use of the battery. Compared with ion batteries, lithium-sulfur batteries are a new generation of energy storage batteries, and their theoretica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/525H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01M4/366H01M4/38H01M4/525H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 单炯威李运勇黄莹欧长志袁星星
Owner GUANGDONG UNIV OF TECH
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