Preparation method of sulfur/carbon/oxide combined electrode material

A composite electrode and oxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of sulfur particle shedding cycle capacity, attenuation, etc., and achieve the effects of industrial production, simple process, and convenient operation

Inactive Publication Date: 2015-10-28
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The carbon material with novel structure and small pore size effectively limits the particle size of sulfur element, and the carbon material with good conductivity improves the conductivity of elemental sulfur. However, the volume expansion and contraction of sulfur in the sulfur / carbon composite material during charge and discharge, If there is no other coating on the surface of the sulfur particles, the sulfur particles will inevitably fall off and cause the cycle capacity decay phenomenon.

Method used

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  • Preparation method of sulfur/carbon/oxide combined electrode material
  • Preparation method of sulfur/carbon/oxide combined electrode material
  • Preparation method of sulfur/carbon/oxide combined electrode material

Examples

Experimental program
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Embodiment 1

[0029] The composition of a sulfur / carbon / oxide composite electrode material is designed as:

[0030] Silicon oxide, 23wt%; Sulfur element, 70% by mass; Graphene, 7wt% by mass;

[0031] A preparation method of sulfur / carbon / oxide composite electrode material: comprising the following steps:

[0032] 1) Weigh 10.4 grams of sodium thiosulfate pentahydrate and 0.14 grams of graphene and mix them in 30 milliliters of water-ethanol solution to configure the sodium thiosulfate solution: wherein the volume ratio of water to ethanol is 0.5;

[0033] 2) Slowly drop in phosphoric acid solution, the pH of phosphoric acid solution is controlled at 4; the molar ratio of phosphoric acid and sodium thiosulfate is controlled at 1.2; stirring, filtering, drying, etc., to obtain sulfur / graphene material;

[0034] 3) Mix the sulfur / graphene material, 1.59 grams of tetraethyl orthosilicate, and a surfactant in an alcohol solution of deionized water, and stir evenly:

[0035] 4) Slowly add alkal...

Embodiment 2

[0038] The composition of a sulfur / carbon / oxide composite electrode material is designed as:

[0039] Copper oxide, 15wt%; Sulfur element, mass fraction 75%; Graphene, mass fraction 10wt%;

[0040] Silver oxide, 19wt%; elemental sulfur, mass fraction 71%; carbon nanotubes, mass fraction 10wt%;

[0041] Nickel oxide, 10wt%; elemental sulfur, mass fraction 81%; CMK-3, mass fraction 9wt%;

[0042] A preparation method of sulfur / carbon / oxide composite electrode material: comprising the following steps:

[0043] 1) Weigh a certain mass of sodium thiosulfate and carbon material mixed in the organic solution of deionized water, stir evenly:

[0044] 2) Slowly drop into the acetic acid solution, the pH of the acetic acid solution is controlled at 5; the molar ratio of acetic acid to sodium thiosulfate is controlled at 1.25; stirring, filtering, drying, etc., to obtain the sulfur / carbon material;

[0045] 3) Mix the sulfur / carbon material, tetraethyl orthosilicate, and surfactant wi...

Embodiment 3

[0049] The composition design of a kind of sulfur / carbon / oxide compound electrode material is the same as embodiment 1,

[0050] Include the following steps:

[0051] 1) Weigh 10.4 grams of sodium thiosulfate pentahydrate and 0.14 grams of graphene mixed in a tetrahydrofuran solution of 30 milliliters of water, and configure the sodium thiosulfate solution: wherein, the volume ratio of water to tetrahydrofuran is 0.6;

[0052] 2) Slowly drop in benzenesulfonic acid solution, the pH of phosphoric acid solution is controlled at 4.75; the molar ratio of benzenesulfonic acid and sodium thiosulfate is controlled at 1.1; stirring and filtering, drying, etc., to obtain sulfur / graphene material;

[0053] 3) Mix a certain mass ratio of sulfur / graphene material, methyl silicon trichloride, and surfactant with an alcohol solution of deionized water, and stir evenly:

[0054] 4) Slowly add the alkali solution dropwise, stir at a constant speed for 5 hours, let stand, centrifuge, wash and d...

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Abstract

The invention relates to a preparation method of a sulfur/carbon/oxide combined electrode material. The preparation method comprises depositing sulfur and oxide on a carbon material as a carrier with excellent performances to obtain the sulfur/carbon/oxide combined electrode material. The carbon material is one of graphene, CMK-3, carbon nanotubes and carbon black. The oxide is one of silica, copper oxide, silver oxide, nickel oxide, ferrous oxide, tin oxide and titanium oxide. The sulfur/carbon/oxide combined electrode material comprises 50-90wt% of sulfur, 5-20wt% of carbon and 5-30wt% of the oxide. Through control of acid types and pH, and organic solvent types and properties, the sulfur/carbon/oxide combined electrode material with fine particles and high coating uniformity is obtained. The sulfur/carbon/oxide combined electrode material as a lithium-sulfur battery positive pole material has high specific capacity and excellent cycling properties and has a good application prospect in the field of batteries.

Description

technical field [0001] The invention relates to a preparation method of an electrode material, in particular to a preparation method of a sulfur / carbon / oxide composite electrode material. Background technique [0002] Lithium-sulfur batteries have the advantages of high specific capacity and low cost, and are very promising energy storage batteries. The sulfur cathode material is one of the key factors restricting the promotion of lithium-sulfur batteries. Sulfur used in commercial batteries has poor conductivity, and volume expansion and contraction occur during charging and discharging, causing the electrode material to fall off the surface of the metal current collector, resulting in rapid capacity decay of lithium-sulfur batteries and low sulfur utilization. At present, carbon materials with large specific surface area and high conductivity are commonly used to support simple sulfur, and the prepared carbon / sulfur composites exhibit high specific capacity, good cycle pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/052
CPCH01M4/366H01M4/62H01M4/625H01M10/052Y02E60/10
Inventor 范美强位攀陈达陈海潮柴文详田光磊舒康颖
Owner CHINA JILIANG UNIV
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