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A kind of preparation method and application of Prussian blue/graphene/sulfur composite material

A technology of Prussian blue and composite materials, applied in the field of preparation of Prussian blue/graphene/sulfur (PB/rGO/S) composite materials, can solve problems such as poor conductivity, safety problems of lithium-sulfur batteries, and potential safety hazards, and achieve Improve the electronic conductivity and ionic conductivity, the preparation process is clean and environmentally friendly, and the effect of improving the cycle performance

Active Publication Date: 2019-07-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the lithium-sulfur battery system has low utilization of active materials, poor cycle life, poor rate performance, and potential safety hazards, which still restrict its commercial development.
The main reasons for the above problems are as follows: (1) elemental sulfur and discharge product lithium sulfide (Li 2 S) Poor conductivity, which is an ionic insulator, resulting in poor conductivity of the entire battery system; (2) Lithium polysulfide, an intermediate product of lithium-sulfur battery discharge, is easily dissolved in ether electrolyte, causing the discharge product to migrate to the negative electrode through the electrolyte On the surface, it reacts with the negative electrode, which reduces the active material of the negative electrode and affects the performance of the lithium-sulfur battery; (3) The volume expansion of elemental sulfur is serious during the charging process (volume expansion is about 80%), causing safety problems for lithium-sulfur batteries

Method used

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  • A kind of preparation method and application of Prussian blue/graphene/sulfur composite material
  • A kind of preparation method and application of Prussian blue/graphene/sulfur composite material
  • A kind of preparation method and application of Prussian blue/graphene/sulfur composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Under the condition of low-temperature cooling liquid circulation, 120 mL of concentrated H 2 SO 4 , 50mL concentrated HNO 3 and 2.5 gNaNO 3 , continuously stirred for 2 h; gradually added 15 g of potassium permanganate, stirred for 1 h, removed from the cooling liquid circulation system, and continued stirring at room temperature for 48 h to obtain a viscous graphite oxide solution. Slowly add 80 mL of deionized water to the viscous graphite oxide solution. After cooling down to room temperature, add deionized water to dilute the graphite oxide solution to 750 mL. After stirring evenly, add 30% H 2 o 2 , until the color of the graphite oxide liquid turns bright yellow and then stand still. The resulting solution was diluted with HCl at a ratio of 1:10 to obtain graphene oxide with a concentration of 5 mg / mL.

[0025] (2) Add 0.11g of potassium ferricyanide to 10mL of 0.1M hydrochloric acid, add 3.3g of PVP with a relative molecular mass of about 40,000, stir e...

Embodiment 2

[0028] (1) Under the condition of low-temperature cooling liquid circulation, 120 mL of concentrated H 2 SO 4 , 50mL concentrated HNO 3 and 2.5 gNaNO 3 , continuously stirred for 2 h; gradually added 15 g of potassium permanganate, stirred for 1 h to withdraw from the cooling liquid circulation system, and continued stirring at room temperature for 48 h to obtain a viscous graphite oxide solution. Slowly add 80 mL of deionized water to the viscous graphite oxide solution. After cooling down to room temperature, add deionized water to dilute the graphite oxide solution to 750 mL. After stirring evenly, add 30% H 2 o 2 , until the color of the graphite oxide liquid turns bright yellow and then stand still. The resulting solution was diluted with HCl at a ratio of 1:10 to obtain graphene oxide with a concentration of 3 mg / mL.

[0029] (2) Add 0.11g of potassium ferricyanide to 10mL of 0.1M hydrochloric acid, add 3.3g of PVP with a relative molecular mass of about 40,000, sti...

Embodiment 3

[0032] (1) Under the condition of low-temperature cooling liquid circulation, 120 mL of concentrated H 2 SO 4 , 50mL concentrated HNO 3 and 2.5 gNaNO 3 , continuously stirred for 2 h; gradually added 15 g of potassium permanganate, stirred for 1 h to withdraw from the cooling liquid circulation system, and continued stirring at room temperature for 48 h to obtain a viscous graphite oxide solution. Slowly add 80 mL of deionized water to the viscous graphite oxide solution. After cooling down to room temperature, add deionized water to dilute the graphite oxide solution to 750 mL. After stirring evenly, add 30% H 2 o 2 , until the color of the graphite oxide liquid turns bright yellow and then stand still. The resulting solution was diluted with HCl at a ratio of 1:10 to obtain graphene oxide with a concentration of 1 mg / mL.

[0033] (2) Add 0.11g of potassium ferricyanide to 10mL of 0.1M hydrochloric acid, add 3.3g of PVP with a relative molecular mass of about 40,000, sti...

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Abstract

The invention discloses a preparation method of a PB / rGO / S composite material. The method comprises the following steps of (1) adding potassium ferricyanide, a hydrochloric acid, PVP and graphene oxide into a polytetrafluoroethylene reaction kettle for hydrothermal reaction, and centrifugally separating and drying a hydrothermal product to obtain a PB / rGO compound; and (2) mixing the obtained PB / rGO compound and elemental sulfur, performing heating and melting under a protected condition of inertia gas and then cooling to a room temperature to obtain the PB / rGO / S composite material. In the composite material prepared by the method, PB is low in cost and has no pollution, the shuttle effect of polysulfide lithium can be prevented when the PB is used as a lithium-sulfur battery positive electrode material, graphene has good conductivity, and the integral electrochemical performance can be improved.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and relates to a preparation method and application of a composite material, in particular to a preparation method and application of a Prussian blue / graphene / sulfur (PB / rGO / S) composite material. Background technique [0002] Lithium-sulfur batteries use metal lithium as the negative electrode and elemental sulfur as the positive electrode. The theoretical specific energy can reach 2600 Wh / kg, which is much larger than the commercial secondary batteries used at this stage. In addition, sulfur has a wide range of sources, is cheap, and is environmentally friendly, so lithium-sulfur batteries are considered to be a new generation of high-energy-density energy storage systems with great potential. [0003] However, the low utilization rate of active materials in the lithium-sulfur battery system, poor cycle life, poor rate performance, and potential safety hazards still restrict its commer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/625H01M4/628H01M10/052H01M2004/028Y02E60/10
Inventor 范立双吴宪张乃庆孙克宁
Owner HARBIN INST OF TECH