Method for synthesizing TiO2/C (titanium dioxide/carbon) composite material on basis of MOF (metal organic framework) structure and application

A metal-organic framework, carbon composite technology, applied in structural parts, electrical components, battery electrodes, etc., to achieve the effect of improving cycle performance, large specific surface area, and inhibiting volume expansion

Inactive Publication Date: 2017-09-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the deficiency of existing lithium-sulfur battery cathode materials, and provides a method and application for synthesizing titanium dioxide and carbon composite materials based on a metal-organic framework structure. TiO prepared by high-temperature treatment of MOF 2 The / C composite material has excellent electrical conductivity due to the presence of carbon, which can solve the problem of elemental sulfur insulation. In addition, TiO 2 As a positive electrode material for lithium-sulfur batteries, it can form a strong Lewis acid-base interaction with polysulfide polymers, thereby inhibiting the shuttle effect of lithium polysulfides, and improving the electrochemical performance of lithium-sulfur batteries as a whole.

Method used

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  • Method for synthesizing TiO2/C (titanium dioxide/carbon) composite material on basis of MOF (metal organic framework) structure and application
  • Method for synthesizing TiO2/C (titanium dioxide/carbon) composite material on basis of MOF (metal organic framework) structure and application
  • Method for synthesizing TiO2/C (titanium dioxide/carbon) composite material on basis of MOF (metal organic framework) structure and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Weigh 0.5g terephthalic acid, add it to the mixed solution of DMF and methanol (1ml methanol solvent, 9ml DMF solvent), slowly add 0.26ml tetrabutyl titanate dropwise during the stirring process, and continue stirring for 30min, The mixed solution was transferred to a polytetrafluoroethylene reactor, and hydrothermally reacted at 120°C for 12h. After the temperature dropped, it was centrifuged and washed with methanol for more than three times, and then dried in an oven at 40°C for 24h to obtain a white Ti-MOF powder.

[0026] (2) Weigh 50 mg of the white Ti-MOF powder that has been prepared, grind it evenly, and calcinate it at 600 °C for 2 h at a heating rate of 5 °C / min under argon gas. After cooling down, black powder TiO 2 / C Composite.

[0027] (3) Add 50 mgTiO 2 Grind the / C composite material with 200 mg of pure sulfur evenly, put it into a tube furnace with argon as a protective gas, and calcinate at 155°C for 12 hours to obtain TiO 2 / C / S Composite.

Embodiment 2

[0029] (1) Weigh 0.5g terephthalic acid, add it to the mixed solution of DMF and methanol (1ml methanol solvent, 9ml DMF solvent), slowly add 0.26ml tetrabutyl titanate dropwise during the stirring process, and continue stirring for 30min, The mixed solution was transferred to a polytetrafluoroethylene reactor, and hydrothermally reacted at 120°C for 12h. After the temperature dropped, it was centrifuged and washed with methanol for more than three times, and then dried in an oven at 40°C for 24h to obtain a white Ti-MOF powder.

[0030] (2) Weigh 50 mg of the white Ti-MOF powder that has been prepared, grind it evenly, and calcinate it at 700°C for 2 h at a heating rate of 5°C / min under argon gas. After cooling down, black powder TiO 2 / C Composite.

[0031] (3) Add 50 mgTiO 2 Grind the / C composite material with 200 mg of pure sulfur evenly, put it into a tube furnace with argon as a protective gas, and calcinate at 155°C for 12 hours to obtain TiO 2 / C / S Composite.

Embodiment 3

[0033] (1) Weigh 0.5g terephthalic acid, add it to the mixed solution of DMF and methanol (1ml methanol solvent, 9ml DMF solvent), slowly add 0.26ml tetrabutyl titanate dropwise during the stirring process, and continue stirring for 30min, The mixed solution was transferred to a polytetrafluoroethylene reactor, and hydrothermally reacted at 120°C for 12h. After the temperature dropped, it was centrifuged and washed with methanol for more than three times, and then dried in an oven at 40°C for 24h to obtain a white Ti-MOF powder.

[0034] (2) Weigh 50 mg of the white Ti-MOF powder that has been prepared, grind it evenly, and calcinate it at 800°C for 2 h at a heating rate of 5°C / min under argon gas. After cooling down, black powder TiO 2 / C Composite.

[0035] (3) Add 50 mg TiO 2 Grind the / C composite material with 200 mg of pure sulfur evenly, put it into a tube furnace with argon as a protective gas, and calcinate at 155°C for 12 hours to obtain TiO 2 / C / S Composite.

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Abstract

The invention discloses a method for synthesizing a TiO2 / C (titanium dioxide / carbon) composite material on the basis of an MOF (metal organic framework) structure and application. The method comprises the following steps: (1) preparing a Ti-MOF by virtue of a hydrothermal method; (2) treating the Ti-MOF in a tube furnace to obtain the TiO2 / C composite material at high temperature under the protection of inert gas; (3) mixing the TiO2 / C composite material and elemental sulfur, performing heating melting under the protection of the inert gas, and cooling to room temperature to obtain a TiO2 / C / S composite material. According to the method, the TiO2 / C composite material is prepared by treating the MOF at high temperature, and the C has high electrical conductivity, so that problems about the insulativity of the elemental sulfur can be well solved; in addition, strong Lewis acid-base actions can be achieved by TiO2 which serves as a cathode material for a lithium-sulfur battery and a sulfur polymer, thereby inhibiting the shuttle effect of lithium polysulfide and improving the overall electrochemical performance of the lithium-sulfur battery.

Description

technical field [0001] The invention belongs to the technical field of energy materials and relates to a TiO 2 The preparation method and application of / C / S composite materials, especially the method and application of synthesizing titanium dioxide and carbon composite materials based on metal-organic framework structure. Background technique [0002] Lithium-sulfur batteries use metal lithium as the negative electrode and elemental sulfur as the positive electrode. The theoretical specific energy can reach 2600 Wh / kg, which is much larger than the commercial secondary batteries used at this stage. In addition, sulfur has a wide range of sources, is cheap, and is environmentally friendly, so lithium-sulfur batteries are considered to be a new generation of high-energy-density energy storage systems with great potential. [0003] However, at present, lithium-sulfur batteries are facing the following three major problems: (1) the sulfur cathode is an insulator material; (2) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/366H01M4/38H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 范立双王茂旭孙克宁张乃庆
Owner HARBIN INST OF TECH
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