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Preparation method of G-quadruplex/heme enzyme/carbon nanotube composite and application of G-quadruplex/heme enzyme/carbon nanotube composite to lithium-sulfur battery

A technology of carbon nanotubes and composite materials, which is applied in battery electrodes, nanotechnology, nanotechnology, etc., can solve the problems of low utilization rate of active materials, hindering the process of practical application, corrosion of metal lithium, etc., and achieves easy mass production and inhibition Shuttle effect, solve the effect of dissolution

Active Publication Date: 2019-05-10
WENZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, lithium polysulfides formed during charging and discharging of lithium-sulfur batteries are easily soluble in liquid electrolytes, causing shuttle effects, volume expansion during charging and discharging, and corrosion of metal lithium, resulting in low utilization of active materials in lithium-sulfur batteries. , low coulombic efficiency, and poor cycle performance seriously hinder its practical application

Method used

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  • Preparation method of G-quadruplex/heme enzyme/carbon nanotube composite and application of G-quadruplex/heme enzyme/carbon nanotube composite to lithium-sulfur battery
  • Preparation method of G-quadruplex/heme enzyme/carbon nanotube composite and application of G-quadruplex/heme enzyme/carbon nanotube composite to lithium-sulfur battery
  • Preparation method of G-quadruplex/heme enzyme/carbon nanotube composite and application of G-quadruplex/heme enzyme/carbon nanotube composite to lithium-sulfur battery

Examples

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Effect test

Embodiment 1

[0042] Example 1: Preparation of Hemin / G4 / carbon nanotube (-COOH) / S cathode material and its application in lithium-sulfur batteries

[0043] (1) Preparation of carboxylated carbon nanotubes:

[0044] 1g CNT (carbon nanotube) and 100ml mixed acid (volume ratio 98%H 2 SO 4 :68%HNO 3 =3:1) Sonicate at 37°C for 2 hours, dilute the obtained black suspension with water to 250ml, filter through a Buchner funnel with a 0.22μmol / L filter membrane, rinse repeatedly until pH ≥ 4.5, and dry at room temperature for later use.

[0045] Weigh 1 g of SWCNT (single-walled carbon nanotube) and dissolve it in 10 ml of phosphate buffer (20 mmol / L, pH 7.0) added with 0.5 wt % sodium cholate surfactant, and sonicate for 2 h. Finally, CNT-COOH with better dispersion is obtained;

[0046] (2) Preparation of CNT-COOH / S composite material: Take 200 mg of the above-mentioned CNT-COOH and 200 mg of elemental sulfur in a mortar, thoroughly grind the porous carbon and sulfur evenly, transfer the resulti...

Embodiment 2

[0052] Example 2: Preparation of Hemin / G4 / carbon nanotube (-OH) / S cathode material and its application in lithium-sulfur batteries

[0053] (1) Preparation of hydroxylated carbon nanotubes:

[0054] Mix concentrated nitric acid and concentrated sulfuric acid at a volume ratio of 1:3, then put the purified carbon nanotubes obtained in step (1) into the mixed solution, heat in a water bath at 50°C for 12 hours for hydroxylation treatment, and then continuously Dilute the solution until the pH reaches 7. Then it is filtered and dried, and ball milled in an agate jar to obtain hydroxylated multi-walled carbon nanotubes;

[0055] (2) Preparation of carbon nanotube (-OH) / S composite material: take 200 mg of the above-mentioned CNT (-OH) and 400 mg of elemental sulfur in a mortar, fully grind the porous carbon and sulfur evenly, transfer the resulting mixture to 25 ml and weigh bottle, and add 6mL CS 2 Stir well, wait until CS 2 After the volatilization is complete, transfer the ...

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Abstract

The invention provides a preparation method of a G-quadruplex / heme enzyme / carbon nanotube composite and application of the G-quadruplex / heme enzyme / carbon nanotube composite to a lithium-sulfur battery. The preparation method of the G-quadruplex / heme enzyme / carbon nanotube composite comprises the steps that a heme enzyme and a G-quadrant are added into deionized water containing K<+>, still standing is conducted for 1-3 hours, thus the heme enzyme and the G-quadrant are self-assembled to form a stable G-quadruplex / heme enzyme structure, then G-quadruplex / heme enzyme and a carbon nanotube are added into an N-methyl pyrrolidone solvent, stirring and even ultrasonic dispersion are conducted, in obtained paste, the obtained composite paste is evenly brushed on the surface of a cathode materialof the lithium-sulfur battery by a coater, then drying is conducted, and thus the G-quadruplex / heme enzyme / carbon nanotube composite is obtained (directly used for follow-up assembling and testing ofthe battery). The preparation method is easy to operate, the condition is mild, and mass production is easy; and polysulfide ions can be dissolved in a liquid electrolyte in the charging and discharging processes of the lithium sulfur battery, the shuttle effect is effectively inhibited, and the coulombic efficiency and cycle stability of the lithium sulfur battery are improved.

Description

technical field [0001] The invention belongs to the research field of nanocomposite materials, and in particular relates to a preparation method of a G-quadruplex / heme enzyme / carbon nanotube composite material for lithium-sulfur batteries and its application in lithium-sulfur battery electrodes. Background technique [0002] With the rapid economic development and increasing energy consumption, the depletion of fossil fuel reserves and the environmental pollution caused by combustion have made people's demand for new alternative energy sources more and more urgent. New energy, especially chemical energy, has the characteristics of cleanness, environmental protection, safety and efficiency, and meets the requirements of the sustainable development strategy of human beings, so it is very popular. Since its commercialization in 1991, lithium-ion batteries have been widely used in portable electronic communication equipment, grid storage, aerospace equipment, electric bicycles a...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 杨植丁欣慰聂华贵詹迎新张永贵周苏雅侯俊婕禅丹赖玉崇黄少铭
Owner WENZHOU UNIVERSITY
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