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A kind of preparation method of porous graphene/carbon nanotube lithium sulfur cathode material

A technology of porous graphene and carbon nanotubes, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of active material sulfur loss and other issues

Active Publication Date: 2020-08-25
SYNERGY INNOVATION INST OF GDUT HEYUAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, solve the problem of active material sulfur loss, provide a kind of porous graphene / carbon nanotube lithium sulfur cathode material and its preparation method

Method used

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  • A kind of preparation method of porous graphene/carbon nanotube lithium sulfur cathode material
  • A kind of preparation method of porous graphene/carbon nanotube lithium sulfur cathode material
  • A kind of preparation method of porous graphene/carbon nanotube lithium sulfur cathode material

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Embodiment 1

[0021] 1) Preparation of monodisperse silica microspheres: mix ethyl orthosilicate and absolute ethanol, the volume ratio of ethyl orthosilicate and absolute ethanol is 1:20.4; in addition, deionized water, concentrated ammonia water and Mix absolute ethanol, the volume ratio of deionized water, concentrated ammonia water and absolute ethanol is 1:3.5:16.8.

[0022] 2) Mix and react the two groups of solutions in step 1) for 24 hours with magnetic stirring to obtain monodisperse silica microspheres with a diameter of 200-300 nm. After drying, add deionized water to prepare a water dispersion with a mass percentage concentration of 50 mg / mL. Liquid A.

[0023] 3) Prepare graphene oxide: mix graphite and sodium nitrate, add concentrated sulfuric acid ice bath and stir; then add potassium permanganate, remove ice bath and titrate deionized water, pour hydrogen peroxide, graphite, sodium nitrate and potassium permanganate The mass ratio is 2.5:1:6.3, and the volume ratio of conce...

Embodiment 2

[0032] 1) Preparation of monodisperse silica microspheres: mix ethyl orthosilicate and absolute ethanol, the volume ratio of ethyl orthosilicate and absolute ethanol is 1:20.4; in addition, deionized water, concentrated ammonia water and Mix absolute ethanol, the volume ratio of deionized water, concentrated ammonia water and absolute ethanol is 1:3.5:16.8.

[0033] 2) Mix and react the two groups of solutions in step 1) for 24 hours with magnetic stirring to obtain monodisperse silica microspheres with a diameter of 200-300 nm. After drying, add deionized water to prepare a water dispersion with a mass percentage concentration of 50 mg / mL. Liquid A.

[0034] 3) Prepare graphene oxide: mix graphite and sodium nitrate, add concentrated sulfuric acid ice bath and stir; then add potassium permanganate, remove ice bath and titrate deionized water, pour hydrogen peroxide, graphite, sodium nitrate and potassium permanganate The mass ratio is 2.5:1:6.3, and the volume ratio of conce...

Embodiment 3

[0040] 1) Preparation of monodisperse silica microspheres: mix ethyl orthosilicate and absolute ethanol, the volume ratio of ethyl orthosilicate and absolute ethanol is 1:20.4; in addition, deionized water, concentrated ammonia water and Mix absolute ethanol, the volume ratio of deionized water, concentrated ammonia water and absolute ethanol is 1:3.5:16.8.

[0041] 2) Mix and react the two groups of solutions in step 1) for 24 hours with magnetic stirring to obtain monodisperse silica microspheres with a diameter of 200-300 nm. After drying, add deionized water to prepare a water dispersion with a mass percentage concentration of 50 mg / mL. Liquid A.

[0042] 1) Prepare graphene oxide: mix graphite and sodium nitrate, add concentrated sulfuric acid ice bath and stir; then add potassium permanganate, remove ice bath and titrate deionized water, pour hydrogen peroxide, graphite, sodium nitrate and potassium permanganate The mass ratio is 2.5:1:6.3, and the volume ratio of conce...

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Abstract

The invention provides a preparation method of a porous graphene / carbon nano tube lithium sulfur anode material. The method comprises the steps of introducing silicon dioxide microspheres as a template, mixing with a carbon nano tube dispersion liquid, dropwise adding a sodium ascorbate solution, using hydrofluoric acid for soaking for 5 to 7 days, and obtaining a porous graphene / carbon nano tube;grinding with a sulfur elementary substance, using a hydrothermal reaction kettle for heating for 10 to 15h at 140 to 160 DEG C under the argon protection, and obtaining a sulfur / porous graphene / carbon nano tube. The material prepared by the invention adopts the porous graphite / carbon nano tube composite material as a frame so as to form a three-dimensional conductive network structure, so that sulfur can be stored, and a battery performance is improved.

Description

technical field [0001] The invention relates to a preparation method of a porous graphene / carbon nanotube lithium-sulfur cathode material. Background technique [0002] The theoretical specific energy density of lithium-sulfur batteries can reach 2600Wh kg -1 、Theoretical specific capacity can reach 1672mAh g -1 , and because of its rich content, low cost, and relative environmental protection, it has attracted wide attention. However, due to the insulating properties of sulfur itself, polysulfides are easily soluble in the electrolyte during charge and discharge, and various problems such as poor cycle performance limit the application of lithium-sulfur batteries. [0003] Lithium-sulfur batteries have poor cycle performance and poor capacity retention. The main reason is the loss of active material sulfur during the cycle: a. During the cycle, there is a "shuttle effect", that is, the reduction product polysulfide dissolves into the electrolyte and diffuses to It reacts...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/587H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01M4/362H01M4/366H01M4/38H01M4/485H01M4/587H01M4/625H01M10/052Y02E60/10
Inventor 张永光
Owner SYNERGY INNOVATION INST OF GDUT HEYUAN
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