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Graphene/sulfur composite material and preparation method thereof, battery positive electrode and preparation method thereof, and battery

A composite material and battery positive electrode technology, applied in the field of electrochemical materials, can solve the problems that hinder the commercialization of lithium-sulfur batteries, achieve the effects of reducing solubility, improving conductivity, and preventing loss

Inactive Publication Date: 2014-01-15
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the insulating properties of elemental sulfur (conductivity at room temperature is 5×10 -30 S / cm) and the high solubility of its discharge products in organic electrolytes hinder the commercialization of lithium-sulfur batteries

Method used

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  • Graphene/sulfur composite material and preparation method thereof, battery positive electrode and preparation method thereof, and battery
  • Graphene/sulfur composite material and preparation method thereof, battery positive electrode and preparation method thereof, and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Preparation of graphene:

[0027] (1) Put graphite oxide in water for 1 hour to obtain a suspension with a concentration of 0.1g / L,

[0028] (2) Prepare a KOH solution with a concentration of 0.1mol / L, add the KOH solution to the above suspension, and stir until agglomerates appear, wherein the masses of KOH and graphite oxide are 10g and 10g respectively;

[0029] (3) Filter the condensate obtained above, dry at 60°C for 48 hours to obtain a solid powder, then put the solid powder into a muffle furnace, react at 800°C for 5 hours, cool, wash, and dry to obtain graphene with a high specific surface area .

[0030] 2. Preparation of graphene / sulfur composites:

[0031] The obtained 6g of graphene and 6g of elemental sulfur (100 mesh, analytically pure) were fully ground in an agate mortar and evenly. Then put it into a ball mill for ball milling for 2 hours. Put the ground mixture into a vacuum tube furnace, and in a continuous nitrogen or argon protective atmosph...

Embodiment 2

[0033] 1. Preparation of graphene:

[0034] (1) Put graphite oxide in water for 5 hours to obtain a suspension with a concentration of 20g / L.

[0035] (2) Prepare a KOH solution with a concentration of 10mol / L, add the KOH solution to the above suspension, and stir until agglomerates appear, wherein the masses of KOH and graphite oxide are 300g and 10g respectively;

[0036] (3) Filter the condensate obtained above, dry at 80°C for 24 hours to obtain a solid powder, then put the solid powder into a muffle furnace, react at 1200°C for 1 hour, cool, wash, and dry to obtain graphene with a high specific surface area .

[0037] 2. Preparation of graphene / sulfur composites:

[0038] The obtained 6g of graphene and 54g of elemental sulfur (100 mesh, analytically pure) were fully ground in an agate mortar and evenly. Then put it into a ball mill for ball milling for 5 hours. Put the ground mixture into a vacuum tube furnace, and in a continuous nitrogen or argon protective atmosp...

Embodiment 3

[0040] 1. Preparation of graphene:

[0041] (1) Put graphite oxide in water for 2 hours to obtain a suspension with a concentration of 10g / L.

[0042] (2) Prepare a KOH solution with a concentration of 2mol / L, add the KOH solution to the above suspension, and stir until agglomerates appear, wherein the masses of KOH and graphite oxide are 50g and 10g respectively;

[0043] (3) Filter the condensate obtained above, dry at 70°C for 36 hours to obtain a solid powder, then put the solid powder into a muffle furnace, react at 900°C for 4 hours, cool, wash, and dry to obtain graphene with a high specific surface area .

[0044] 2. Preparation of graphene / sulfur composites:

[0045] The obtained 6g high specific surface area graphene and 9g elemental sulfur (100 mesh, analytically pure) were fully ground in an agate mortar. Then put it into a ball mill for ball milling for 3 hours. Put the ground mixture into a vacuum tube furnace, and in a continuous nitrogen or argon protective...

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Abstract

The invention belongs to the field of electrochemistry, and discloses a graphene / sulfur composite material and a preparation method thereof, a battery positive electrode and a preparation method thereof, and a battery. The graphene / sulfur composite material comprises graphene and elemental sulfur at a mass ratio of (1-5):(5-9), moreover, the elemental sulfur is embedded into the microcellular structure of the graphene. According to the graphene / sulfur composite material provided by the invention, the elemental sulfur is embedded into the microcellular structure of the graphene, a graphene / elemental sulfur composite material is prepared, the microcellular structure of the graphene with high specific surface area can prevent loss of a discharging product of sulfur, so that the solubility is reduced; meanwhile, since the graphene has high conductivity and is fully contacted with the elemental sulfur, the conductivity of a sulfur electrode is improved.

Description

technical field [0001] The invention relates to electrochemical materials, in particular to a graphene / sulfur composite material and a preparation method thereof. The invention also relates to a battery positive electrode using the graphene / sulfur composite material as a positive electrode active material and a preparation method thereof. The present invention also relates to a battery using the positive electrode of the battery. Background technique [0002] With the development of various new energy sources, the miniaturization of portable electronic devices and the extensive demand for large-capacity and high-power chemical power sources for electric vehicles. At present, most commercial lithium-ion batteries use inorganic cathode / graphite systems, and these cathode materials are mainly lithium iron phosphate, lithium manganese oxide, lithium cobalt oxide, lithium nickel oxide and mixed systems. Although this type of system has excellent electrochemical performance, it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M4/13H01M4/139H01M10/052
CPCH01M4/13H01M4/139H01M4/38H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 周明杰钟玲珑王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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