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Self-supporting perforated reducing graphene oxide material and preparation method thereof

A graphene, self-supporting technology, applied in nanotechnology for materials and surface science, electrode carriers/current collectors, electrical components, etc., can solve the problem of deteriorating the cycle performance of lithium-sulfur batteries, affecting battery energy density, and reducing sulfur activity Material utilization, etc.

Inactive Publication Date: 2018-11-23
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This phenomenon, known as the shuttling effect, reduces the availability of sulfur active species
At the same time insoluble Li 2 S and Li 2 S 2 Deposited on the surface of the lithium negative electrode, which further deteriorates the cycle performance of the lithium-sulfur battery;
[0007] (3) The final product of the reaction is Li 2 S is also an electronic insulator and will be deposited on the sulfur electrode, while lithium ions migrate slowly in solid lithium sulfide, slowing down the electrochemical reaction kinetics;
[0008] (4) Sulfur and final product Li 2 The density of S is different. When sulfur is lithiated, the volume expands by about 79%, which easily leads to Li 2 Pulverization of S, causing safety problems in lithium-sulfur batteries
However, the tiny pores are not only not conducive to the penetration of sulfur into the material, but also limit the assembly of sulfur nanoparticles, resulting in a low overall battery capacity and discharge platform, thus affecting the energy density of the overall battery.

Method used

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  • Self-supporting perforated reducing graphene oxide material and preparation method thereof
  • Self-supporting perforated reducing graphene oxide material and preparation method thereof
  • Self-supporting perforated reducing graphene oxide material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Use a 5mL volumetric flask to measure DOL and DME solutions respectively, place them in vials, and weigh 0.8g of sublimed sulfur and 229.5mg of Li 2 S powder, 2.87g LiTFSI powder and 275.8mg LiNO 3 The powder was added to the above mixed solution, and magnetically stirred at room temperature for 48 hours under the protection of argon to prepare 0.5mol / L Li 2 S 6 Active material electrolyte.

[0033] (2) Use a 5mL volumetric flask to measure DOL and DME solutions respectively, place them in vials, weigh 2.87g LiTFSI powder and 275.8mg LiNO respectively 3 The powder was added to the above mixed solution, and magnetically stirred at room temperature for 48 hours under an argon-protected environment to prepare an electrolyte solution for a lithium-sulfur battery without active substances.

[0034] (3) The graphite flakes were used to prepare a graphene oxide dispersion by the Hummers method, and the dispersion and deionized water were prepared to form a graphene oxid...

Embodiment 2

[0039] (1) Use a 5mL volumetric flask to measure DOL and DME solutions respectively, place them in small bottles, and weigh 0.32g of sublimated sulfur and 198mg of Li 2 S powder, 2.87g LiTFSI powder and 275.8mg LiNO 3 The powder was added to the above mixed solution, and magnetically stirred at room temperature for 48 hours under the protection of argon to obtain 0.2mol / L Li 2 S 6 Active material electrolyte.

[0040] (2) Use a 5mL volumetric flask to measure DOL and DME solutions respectively, place them in vials, weigh 2.87g LiTFSI powder and 275.8mg LiNO respectively 3 The powder was added to the above mixed solution, and magnetically stirred at room temperature for 48 hours under an argon-protected environment to prepare an electrolyte solution for a lithium-sulfur battery without active substances.

[0041] (3) The graphite flakes were used to prepare a graphene oxide dispersion by the Hummers method, and the dispersion and deionized water were prepared to form a graph...

Embodiment 3

[0046] (1) Use a 5mL volumetric flask to measure DOL and DME solutions respectively, place them in small bottles, and weigh 0.32g of sublimated sulfur and 198mg of Li 2 S powder, 2.87g LiTFSI powder and 275.8mg LiNO 3 The powder was added to the above mixed solution, and magnetically stirred at room temperature for 48 hours under the protection of argon to obtain 0.2mol / L Li 2 S 6 Active material electrolyte.

[0047] (2) Use a 5mL volumetric flask to measure DOL and DME solutions respectively, place them in vials, weigh 2.87g LiTFSI powder and 275.8mg LiNO respectively 3 The powder was added to the above mixed solution, and magnetically stirred at room temperature for 48 hours under an argon-protected environment to prepare an electrolyte solution for a lithium-sulfur battery without active substances.

[0048] (3) The graphite flakes were used to prepare a graphene oxide dispersion by the Hummers method, and the dispersion and deionized water were prepared to form a graph...

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Abstract

The invention discloses a self-supporting perforated reducing graphene oxide material and a preparation method thereof. Graphene oxide is reduced by a hydrothermal method and self-assembled, perforating is performed by hydrogen peroxide to form mesoporous and micropore in the surface of the graphene, improving the specific surface area and adding active substance reactive sites, at that same time,the mesoporous and the micropore effectively adsorb lithium polysulfide, thereby effectively inhibiting the shuttle of the lithium polysulfide between the positive electrode and the negative electrode, thereby improving the electrochemical performance of the lithium sulfide battery.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur batteries, in particular to a lithium-sulfur battery positive electrode material, a preparation method thereof, and a lithium-sulfur battery comprising the lithium-sulfur battery positive electrode material. technical background [0002] As the world's population continues to grow, energy demands increase and the climate changes, we must focus on creating a sustainable energy future for humanity while protecting our fragile environment. To achieve this goal, we need to reduce our dependence on fossil fuels and switch to clean, renewable energy. However, these renewable energies require advanced energy storage systems that can store it when it is in excess and release it back to the grid when it is needed to maintain a stable power supply for homes and industries. Unfortunately, lithium-ion batteries cannot meet the high energy requirements of stationary grid energy storage. The limited en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/052B82Y30/00
CPCB82Y30/00H01M4/663H01M10/052Y02E60/10
Inventor 冯奕钰王伟哲封伟曹宇
Owner TIANJIN UNIV