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Conductive carbon black modified silicon dioxide aerogel loaded sulfur composite positive electrode material and preparation method thereof

A composite cathode material, conductive carbon black technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of poor capacity performance and cycle stability, low coulomb efficiency, etc., to achieve excellent capacity performance and cycle stability, improvement ratio Energy density, the effect of improving cycle stability

Active Publication Date: 2018-09-28
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a conductive carbon black modified silica airgel loaded sulfur composite positive electrode material and its preparation method to solve the problems of poor capacity performance and cycle stability and Coulombic problems in lithium sulfur batteries in the prior art. The problem of inefficiency

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  • Conductive carbon black modified silicon dioxide aerogel loaded sulfur composite positive electrode material and preparation method thereof
  • Conductive carbon black modified silicon dioxide aerogel loaded sulfur composite positive electrode material and preparation method thereof
  • Conductive carbon black modified silicon dioxide aerogel loaded sulfur composite positive electrode material and preparation method thereof

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preparation example Construction

[0036] In a second aspect, the present invention provides a method for preparing a conductive carbon black-modified silica airgel-loaded sulfur composite positive electrode material, the method comprising the following steps:

[0037] (1) uniformly mixing conductive carbon black-modified silica airgel with elemental sulfur to obtain a mixture; and

[0038] (2) Under the condition of airtight and inert gas protection, the mixture obtained in step (1) is heated at 115°C to 160°C (such as 115°C, 120°C, 125°C, 130°C, 135°C, 140°C, 145°C, 150° C., 155° C. or 160° C.) for heat treatment to prepare the conductive carbon black modified silica airgel loaded sulfur composite cathode material.

[0039] In the present invention, the inert gas may be, for example, nitrogen gas, argon gas or helium gas, preferably nitrogen gas; Liquid form enters conductive carbon black-modified SiO 2 The internal pores of the airgel are obtained to obtain the conductive carbon black modified silica airge...

Embodiment 1

[0061] ①Ethyl orthosilicate, ethanol, deionized water and sodium lauryl sulfate are prepared into a uniform mixed solution, wherein the mass ratio of ethyl orthosilicate, ethanol and deionized water is 3:5:2, twelve The concentration of sodium alkyl sulfate in the mixture is 5×10 - 3 mol / L; then the conductive carbon black with a particle size of 50nm is added to the mixed solution, and stirred at 200rpm for 1h to obtain a mixed material, wherein the amount of conductive carbon black added is the same as the quality of tetraethyl orthosilicate in the mixed solution The ratio is 1:19.7; then add a hydrochloric acid solution with a concentration of 1 mol / L to the mixture, the amount added is 4% of the mass of the mixture, then stir at 150rpm for 10min and then stand still to obtain a wet gel; Then soak the obtained wet gel in ethanol, tetraethyl orthosilicate and n-hexane respectively for 24 hours to perform solvent exchange and aging steps to obtain a gel; finally, place the o...

Embodiment 2

[0066] Embodiment 2 is basically the same as Embodiment 1, the difference is:

[0067] In ①: the mass ratio of ethyl orthosilicate, ethanol and deionized water is 3:2:2; the particle size of conductive carbon black is 30nm, and the mass ratio of conductive carbon black addition to ethyl orthosilicate in the mixed solution is 1: 66; the addition amount of hydrochloric acid solution is 5% of the mass of the mixture; obtain conductive carbon black modified silica airgel with conductive carbon black doping amount of 5%.

[0068] In ②: Sublimated Sulfur Powder and Conductive Carbon Black Modified SiO 2 The mass ratio of airgel is 1:1; the heat treatment temperature is 150°C; the mass percentage of elemental sulfur is 50% conductive carbon black modified silica airgel loaded sulfur composite positive electrode material.

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Abstract

The invention relates to a conductive carbon black modified silicon dioxide aerogel loaded sulfur composite positive electrode material and a preparation method thereof. The composite positive electrode material comprises conductive carbon black modified silicon dioxide aerogel and elementary sulfur loaded to the conductive carbon black modified silicon dioxide aerogel; and the conductive carbon black modified silicon dioxide aerogel comprises silicon dioxide aerogel and conductive carbon black doped in the silicon dioxide aerogel. The preparation method comprises the steps of enabling the conductive carbon black modified silicon dioxide aerogel and the elementary sulfur to be mixed uniformly to obtain a mixture; and performing heat treatment on the obtained mixture at a temperature of 115-160 DEG C in a sealed condition under inert gas protection to obtain the conductive carbon black modified silicon dioxide aerogel loaded sulfur composite positive electrode material. The composite positive electrode material prepared in the invention has many advantages of excellent capacity performance and cycle stability, high coulombic efficiency and the like in a lithium-sulfur battery. The composite positive electrode material is simple and convenient in method and low in cost, and batch production can be realized easily.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a conductive carbon black-modified silicon dioxide airgel-loaded sulfur composite positive electrode material used in lithium-sulfur batteries and a preparation method thereof. Background technique [0002] The development of efficient and safe electrochemical energy storage devices is one of the key links in the development of new clean energy industries. Secondary battery systems represented by lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries and lithium-ion batteries have been widely used in portable electronic devices, electric bicycles and aerospace fields. At present, the commonly used cathode materials for commercial lithium-ion batteries with the most superior comprehensive performance are mainly metal oxides such as lithium iron phosphate, lithium cobaltate and layered ternary materials. The actual energy density is only...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/362H01M4/38H01M4/62H01M4/625H01M10/052Y02E60/10
Inventor 李健张凡刘圆圆叶冉冉刘韬张丽娟李文静刘斌
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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