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Application of graphene-nanometer metal oxide composite material in lithium sulfur battery

A nano-metal and composite material technology, applied in lithium batteries, battery electrodes, nanotechnology, etc., can solve the problems of poor battery cycle, easy to produce shuttle effect, poor electronic and ionic conductivity of elemental sulfur, etc., to improve electrical conductivity. stability, convenience, and good reproducibility

Inactive Publication Date: 2014-11-12
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the intermediate product lithium polysulfide (Li 2 S x , 4≤x≤8) are easily soluble in organic electrolytes, prone to shuttle effect, volume expansion of sulfur electrodes, poor electron conductivity and ion conductivity of elemental sulfur, resulting in poor cycle performance of batteries

Method used

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  • Application of graphene-nanometer metal oxide composite material in lithium sulfur battery
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  • Application of graphene-nanometer metal oxide composite material in lithium sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] a. Disperse 0.04 g of graphene oxide ultrasonically in 50 ml of absolute ethanol solution.

[0030] b will 0.1g nano TiO 2 Add the graphene oxide aqueous solution and mix and stir for 3 hours to obtain a graphene oxide-nano metal oxide composite material suspension.

[0031] c Under ultraviolet light irradiation, continue to stir the suspension to reduce the graphene oxide-nano metal oxide composite material to obtain a reduced graphene oxide-nano metal oxide composite material suspension.

[0032] d The suspension is centrifuged and washed with deionized water for 5 times, and the sample is freeze-dried to obtain a reduced graphene oxide-nano metal oxide composite material.

[0033] e Nanofiber vulcanization: Place the prepared reduced graphene oxide-nano metal oxide composite material and elemental sulfur on both ends of the glass tube, and then put the glass tube into a tube furnace, and pass inert gas. Heating at 400°C for 2 hours to prepare a sulfur-graphene-nano metal oxi...

Embodiment 2

[0042] a. Disperse 0.04 g of graphene oxide ultrasonically in 50 ml of absolute ethanol solution.

[0043] b 0.2g nano TiO 2 Add the graphene oxide aqueous solution and mix and stir for 3 hours to obtain a graphene oxide-nano metal oxide composite material suspension.

[0044] c Under ultraviolet light irradiation, continue to stir the suspension to reduce the graphene oxide-nano metal oxide composite material

[0045] Material to obtain a reduced graphene oxide-nano metal oxide composite material suspension.

[0046] d The suspension is centrifuged and washed with deionized water for 5 times, and the sample is freeze-dried to obtain a reduced graphene oxide-nano metal oxide composite material.

[0047] e Nanofiber vulcanization: Place the prepared reduced graphene oxide-nano metal oxide composite material and elemental sulfur on both ends of the glass tube, and then put the glass tube into a tube furnace, and pass inert gas. Heating at 400°C for 2 hours to prepare a sulfur-graphene-na...

Embodiment 3

[0056] a. Disperse 0.04 g of graphene oxide ultrasonically in 50 ml of absolute ethanol solution.

[0057] b 0.3g nano TiO 2 Add the graphene oxide aqueous solution and mix and stir for 3 hours to obtain a graphene oxide-nano metal oxide composite material suspension.

[0058] c Under ultraviolet light irradiation, continue to stir the suspension to reduce the graphene oxide-nano metal oxide composite material

[0059] Material to obtain a reduced graphene oxide-nano metal oxide composite material suspension.

[0060] d The suspension is centrifuged and washed with deionized water for 5 times, and the sample is freeze-dried to obtain a reduced graphene oxide-nano metal oxide composite material.

[0061] e Nanofiber vulcanization: Place the prepared reduced graphene oxide-nano metal oxide composite material and elemental sulfur on both ends of the glass tube, and then put the glass tube into a tube furnace, and pass inert gas. Heating at 400°C for 2 hours to prepare a sulfur-graphene-na...

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Abstract

The invention relates to an application of a graphene-nanometer metal oxide composite material in a lithium sulfur battery. The graphene-nanometer metal oxide composite material is used in the lithium sulfur battery as a positive material of the lithium sulfur battery. In the graphene-nanometer metal oxide composite material, a mass ratio of a nanometer metal oxide to graphene is 0.1-5:0.01-0.3. The adoption of reduced graphene oxide as the positive material of the lithium sulfur battery is in favor of improving the conductivity of an electrode. The two dimensional structure of graphene is in favor of improving the fixation of lithium polysulfide; the nanometer metal oxide has a large specific surface area and a strong adsorption performance, can obstruct the dissolving of generated polysulfide in an electrolyte; and the doping of nanoparticles is in favor of reducing severe stacking between graphene sheets, and realizes many wrinkles and a large interlayer spacing.

Description

Technical field [0001] The invention relates to the application of a positive electrode material in a lithium-sulfur battery. technical background [0002] Now the world's environmental pollution, greenhouse effect, energy crisis and other problems are becoming more and more serious. Secondary batteries with high specific energy are of great significance for solving outstanding energy and environmental problems. Among them, the lithium ion battery is one of the batteries with the highest specific energy in the secondary battery. However, in the lithium ion secondary battery system, the specific capacity and cycle performance of the cathode material need to be further optimized. Traditional cathode materials such as LiCoO 2 / Graphite and LiFePO 4 The theoretical energy density of the graphite / graphite system is about 400Wh / kg. Due to the limitation of its theoretical energy density, it is difficult to make a breakthrough in the energy density of lithium-ion batteries even with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62B82Y30/00
CPCB82Y30/00H01M4/364H01M4/48H01M4/625H01M10/052Y02E60/10
Inventor 马艺文张华民张益宁王美日王倩周伟
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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