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Graphene-titanium dioxide aerogel composite material and preparation and application thereof

A technology of titanium dioxide and composite materials, applied in nanotechnology for materials and surface science, electrical components, active material electrodes, etc., can solve the large volume change of sulfur electrodes with low electronic conductivity of sulfur and hinder the commercialization of lithium-sulfur batteries Development and application, deterioration of battery performance and other issues, to achieve good application prospects, improve electrochemical performance, and stabilize cycle performance

Inactive Publication Date: 2018-02-27
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the wide adaptability of current lithium-sulfur batteries is still limited by various limitations, such as the low electronic conductivity of sulfur alone and the large volume change of the sulfur electrode during cycling.
In addition, during the charging and discharging process, the sulfur electrode is not stable, and a soluble intermediate product, lithium polysulfide, will be generated, which shuttles back and forth between the negative electrode and the positive electrode, and chemically reacts with the lithium negative electrode, resulting in the deterioration of battery performance.
As well as the potential safety issues of metallic lithium anodes, these have hindered the commercial development and application of lithium-sulfur batteries

Method used

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  • Graphene-titanium dioxide aerogel composite material and preparation and application thereof
  • Graphene-titanium dioxide aerogel composite material and preparation and application thereof
  • Graphene-titanium dioxide aerogel composite material and preparation and application thereof

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Embodiment 1

[0032] A graphene-titanium dioxide airgel composite material is obtained by growing nano-titanium dioxide particles on a graphene oxide sheet structure by in-situ polymerization.

[0033] The preparation method of above-mentioned graphene-titanium dioxide airgel composite material, concrete steps are:

[0034] Step 1: Weigh 10g of graphene oxide aqueous dispersion (Carbon Valley Shangxi, GO-1, 10mg / g) into a beaker, and measure 40mL of deionized water in the beaker to make a 2mg / mL graphene oxide solution ;

[0035] Step 2: Measure butyl titanate and add it to absolute ethanol to prepare a butyl titanate-ethanol solution with a concentration of 0.010mol / L;

[0036] Step 3: Measure 1mL of butyl titanate-ethanol solution and slowly add it to 20mL of graphene oxide solution, fully stir the obtained mixed solution on a magnetic stirrer for 3h, put it into a hydrothermal reactor for in-situ polymerization reaction, and react The temperature is 180°C, and the reaction time is 12 h...

Embodiment 2

[0039] Add 20 mg of glucose to the graphene oxide solution in Step 1 in Example 1, and the rest are the same as in Example 1. The composite material finally obtained is denoted as TiO 2 -GA-1.

Embodiment 3

[0041] Change the concentration of the butyl titanate-ethanol solution in Example 1 to 0.05mol / L, all the other are the same as Example 1, and the composite material finally obtained is denoted as TiO2 -GA-2.

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Abstract

The invention provides a graphene-titanium dioxide aerogel composite material and preparation and application thereof. The graphene-titanium dioxide aerogel composite material is characterized in thatnano titanium dioxide particles are grown in a graphene oxide lamellar structure by in-situ polymerization. According to the invention, a porous three-dimensional network structure anode material isprepared by virtue of the high specific surface area of graphene aerogel, the high specific capacity of sulfur and the strong adsorption force of nano titanium dioxide on lithium polysulfide, so thata shuttle effect of lithium polysulfide can be effectively solved, and the electrochemical performance of a lithium-sulfur battery can be fully improved. Related test results show that the first cyclespecific discharge capacity of the anode material is 1520mah / g at a current density of 0.5C, and the specific discharge capacity remained at 800mah / g after 100 cycles of circulating. The composite material provided by the invention provides a simple way for preparing the anode material of the lithium-sulfur battery, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a preparation method and application of a graphene-titanium dioxide airgel composite material, which is an ideal lithium-sulfur battery cathode material with high conductivity and strong adsorption force. Background technique [0002] With the continuous growth of the population economy, people's demand for non-renewable fossil energy such as coal, oil, and natural gas continues to rise, resulting in increasingly prominent problems of energy depletion and environmental pollution. Secondary batteries can convert chemical energy into electrical energy through chemical reactions, and have high energy conversion efficiency, and have gradually become the focus of attention. Among many secondary battery systems, lithium-ion secondary batteries have played a very important role in transportation systems and portable electronic devices in recent years due to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01M4/366H01M4/38H01M4/625H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 刘天西王佳王丽娜孙明林
Owner DONGHUA UNIV
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