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Graphene/oxide-based electrode material and lithium-sulfur battery comprising the electrode material

An electrode material, graphene technology, applied in lithium batteries, non-aqueous electrolyte batteries, battery electrodes, etc., can solve the problems of high cost, difficult to control product structure, cumbersome preparation process, etc., to achieve low cost, avoid pollution, and abundant pores. Effect

Active Publication Date: 2018-05-22
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, currently reported TiO 2 , MnO 2 These metal oxides used in lithium-sulfur batteries have their own problems, such as: the preparation process is relatively cumbersome, the product structure is difficult to control, and the cost is high.

Method used

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  • Graphene/oxide-based electrode material and lithium-sulfur battery comprising the electrode material
  • Graphene/oxide-based electrode material and lithium-sulfur battery comprising the electrode material
  • Graphene/oxide-based electrode material and lithium-sulfur battery comprising the electrode material

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Embodiment 1

[0035] This embodiment provides a graphene / oxide-based electrode material. The electrode material includes nano-Fe 2 O 3 The composite formed by the porous macroscopic body of graphene and the nano-sulfur supported on the composite, wherein the nano-sulfur accounts for 60wt.% of the total mass of the electrode material, and the nano-Fe 2 O 3 It accounts for 15wt.% of the total mass of the electrode material, and the specific surface area of ​​the composite is 800m 2 / g.

[0036] The preparation method includes the following steps:

[0037] S1: Add 10mg / mL FeCl to the graphene oxide hydrosol with a concentration of 2mg / mL under stirring conditions 3 The aqueous solution, continue to stir for 2h, and mix well to obtain a uniformly dispersed mixed solution, then add ammonia water (mass fraction of 28%) to the mixed solution, adjust the pH to 10, and obtain a mixed solution M1;

[0038] Wherein, the preparation method of the graphene oxide hydrosol is as follows: weigh the graphite oxide ...

Embodiment 2

[0044] This embodiment provides a graphene / oxide-based electrode material. The electrode material includes nano-Fe 2 O 3 The composite formed by the porous macroscopic body of graphene and the nano-sulfur supported on the composite, wherein the nano-sulfur accounts for 50wt.% of the total mass of the electrode material, and the nano-Fe 2 O 3 Accounting for 20wt.% of the total mass of the electrode material, the specific surface area of ​​the composite is 500m 2 / g.

[0045] The preparation method includes the following steps:

[0046] S1: Add 8mg / mL FeCl to the graphene oxide hydrosol with a concentration of 3mg / mL under stirring conditions 3 The aqueous solution, continue to stir for 1 hour, and mix evenly to obtain a uniformly dispersed mixed solution, then add ammonia water (mass fraction of 28%) to the mixed solution, adjust the pH to 9.5, and obtain a mixed solution M1;

[0047] Wherein, the preparation method of graphene oxide hydrosol is as follows: weigh graphite oxide powder,...

Embodiment 3

[0052] This embodiment provides a graphene / oxide-based electrode material. The electrode material includes nano-Fe 2 O 3 The composite formed by the porous macroscopic body of graphene and the nano-sulfur loaded on the composite, wherein the nano-sulfur accounts for 40wt.% of the total mass of the electrode material, and the nano-Fe 2 O 3 Accounting for 12wt.% of the total mass of the electrode material, the specific surface area of ​​the composite is 700m 2 / g.

[0053] The preparation method includes the following steps:

[0054] S1: Add 12mg / mL FeCl to the graphene oxide hydrosol with a concentration of 4mg / mL under stirring conditions 3 Aqueous solution, continue to stir for 3h, mix evenly to obtain a uniformly dispersed mixed solution, then add ammonia water (mass fraction of 28%) to the mixed solution, adjust the pH to 10.5, and obtain a mixed solution M1;

[0055] Wherein, the preparation method of graphene oxide hydrosol is as follows: Weigh graphite oxide powder, add deionize...

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Abstract

The invention relates to the technical field of lithium-sulfur batteries. Provided is a graphene / oxide-based electrode material. The electrode material comprises a composite formed from nano-Fe2O3 and a porous graphene macroform and nano-sulfur carried by the composite. Compared with the prior art techniques, a certain degree of interaction exists between an electrically-conductive graphene-carbon substrate in the nano-Fe2O3 / porous graphene macroform and elemental sulfur. In particular, Fe2O3 nanoparticles, sulfur and a polysulfide form a strong chemical bond, such that dissolution of the polysulfide can be effectively limited to mitigate a shuttle effect. An appropriate amount of Fe2O3 nanoparticles can improve a reaction-kinetic activity, thereby increasing a utilization rate of an active substance, and accordingly increasing a specific capacity and high-rate cycling stability of a lithium-sulfur battery.

Description

Technical field [0001] The present invention belongs to the technical field of lithium-sulfur batteries, and particularly relates to a graphene / oxide-based electrode material and a lithium-sulfur battery containing the electrode material. Background technique [0002] Lithium-sulfur batteries have problems such as poor sulfur conductivity, volume changes, and the shuttle effect of polysulfides, which affect their practical applications. In addition, how to improve the specific capacity and cycleability of lithium-sulfur batteries still needs more in-depth research. However, carbonaceous materials can be used in lithium-sulfur batteries to solve their existing problems because of their controllable specific surface area, rich pore structure, good electrical conductivity, and easy processing. Among them, graphene has the advantages of excellent electrical conductivity, large specific surface area, strong chemical stability and mechanical properties, and a unique two-dimensional po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/583H01M4/38H01M10/052
CPCH01M4/362H01M4/38H01M4/523H01M4/583H01M10/052Y02E60/10
Inventor 杨全红郑程牛树章游从辉吕伟李宝华康飞宇
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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