Preparation method of lithium-sulphur battery positive pole material with sulfur-graphene composite structure

A graphene composite, lithium-sulfur battery technology, applied in battery electrodes, structural parts, circuits, etc., can solve problems such as damage to the health of operators, limited sulfur load, and time-consuming energy consumption, and achieve the suppression of shuttle and migration channels Short, good adsorption effect

Active Publication Date: 2013-07-24
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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Problems solved by technology

[0005] The method for preparing sulfur-carbon composite materials mainly includes heating, CS 2 Wait for the solution to dissolve S and then impregnate carbon materials, chemical deposition, etc. Among them, the heating method is the most common, and its main advantage is that it is simple, and sulfur can enter the micropores of carbon as short-chain sulfur molecules at higher temperatures, but this This method consumes energy and time, and long-term use will cause serious corrosion to the equipment
while CS 2 Waiting for the solution to dissolve S and then impregnating the carbon material has the problem of limited sulfur loading, and the CS 2 High toxicity, on the one hand, pollutes the environment, and on the other hand, damages the health of the operator
In addition, the problem of chemical deposition is that the prepared sulfur is mostly hundreds of nanometers or micrometers of sulfur, and the reaction process is easy to introduce some impurities of inorganic salts
At present, there is no simple, fast, low-energy and low-consumption method for preparing sulfur nanoparticles.

Method used

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  • Preparation method of lithium-sulphur battery positive pole material with sulfur-graphene composite structure
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  • Preparation method of lithium-sulphur battery positive pole material with sulfur-graphene composite structure

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Embodiment 1

[0028] This embodiment provides a method for preparing a cathode material for a lithium-sulfur battery with a sulfur-graphene composite structure, which is prepared by using graphene, ethylamine and sublimated sulfur as raw materials.

[0029] The specific operation steps are as follows:

[0030] A. Add 0.4 g of sublimed sulfur into 8 mL of ethylamine, and mix uniformly to obtain a first dispersion.

[0031] Take 0.1 g of graphene and add it to 5 mL of acetone, and uniformly mix with ultrasonic waves to obtain a second dispersion;

[0032] B. Under continuous stirring, the first dispersion is added dropwise to the second dispersion at a dropping rate of 0.005 mL / min to obtain a third dispersion;

[0033] C. Slowly add 150 mL of 1 mol / L hydrochloric acid to the third dispersion liquid, and 0.375 g of polyvinylpyrrolidone (PVP) with a molecular weight of 55000 has been dissolved in the hydrochloric acid solution as a surfactant. At this time, nano-sulfur is generated in large ...

Embodiment 2

[0036] This embodiment provides a method for preparing a positive electrode material for a lithium-sulfur battery, which is prepared by using graphene, ethylenediamine, and sublimated sulfur as raw materials.

[0037] The specific operation steps are as follows:

[0038] A. Add 0.2 g of sublimation sulfur into 1 mL of ethylenediamine, and uniformly mix to obtain a first dispersion;

[0039] Take 0.05g of graphene and add it to 50mL of anhydrous ethanol, and uniformly mix with ultrasonic waves to obtain a second dispersion;

[0040] B. Under continuous stirring, the first dispersion is added dropwise to the second dispersion at a dropping rate of 0.05 mL / min to obtain a third dispersion;

[0041] C. Quickly add 150 mL of deionized water to the third dispersion. At this time, nano-sulfur is generated in a large amount in the third dispersion liquid and adsorbed on the surface and pores of graphene, and the composite material is gradually formed;

[0042] D. Continue stirring ...

Embodiment 3

[0056] The present embodiment provides a method for preparing a positive electrode material for a lithium-sulfur battery, which is prepared by using surface-functionalized graphene, methylamine, and sublimated sulfur as raw materials.

[0057] The specific operation steps are as follows:

[0058] A. Add 2 g of sublimed sulfur into 5 mL of methylamine, and mix uniformly to obtain the first dispersion.

[0059] Take 0.5g of functionalized graphene and add it to 25mL of isopropanol, and after uniform mixing with ultrasonic waves, a second dispersion is obtained;

[0060] B. Under continuous stirring, the first dispersion is added dropwise to the second dispersion at a dropping rate of 0.01 mL / min to obtain a third dispersion;

[0061] C. Slowly add 100 mL of 1 mol / L acetic acid to the third dispersion liquid, and 3.64 g of cetyltrimethylammonium bromide (CTAB) has been dissolved in the acetic acid solution. At this time, it can be seen that the nano-sulfur-graphene composite ma...

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Abstract

The invention relates to the technical field of batteries, and particularly provides a preparation method of a lithium-sulphur battery positive pole material with a sulfur-graphene composite structure. The preparation method comprises the steps of mixing sulphur powder and organic amine to prepare first dispersion liquid, wherein the weight-volume ratio of sulphur and the organic amine is 0.05-0.4 g:1 mL; dispersing graphene into an organic solvent to prepare second dispersion liquid, wherein the weight-volume ratio of the graphene and the organic solvent is 0.0005-0.02 g:1 mL; dripping the first dispersion liquid to the second dispersion liquid, and uniformly mixing to form third dispersion liquid; adding water or acid liquor to the third dispersion liquid, and continuing to stir so that a sulfur-graphene composite is separated out from the third dispersion liquid; carrying out solid-liquid separation on the third dispersion liquid, and drying an obtained first solid to obtain the lithium-sulphur battery positive pole material. The lithium-sulphur battery prepared through the method provided by the invention has the advantages of good coulomb efficiency and recycling; and the preparation method provided by the invention is simple, fast and low in consumption.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a preparation method of a positive electrode material of a lithium-sulfur battery. Background technique [0002] With the increasing shortage of traditional resources and energy and the increasingly serious environmental problems, the development of new energy storage and conversion technologies has become the focus of energy strategies of various countries. Among them, lithium-sulfur batteries are high energy density secondary batteries with great development potential and application prospects. It has high specific capacity (1675mAh / g) and high energy density (2600Wh / kg), and the actual energy density has reached 400Wh / kg. In addition, sulfur as an active material also shows incomparable advantages in terms of cost and environmental friendliness. [0003] Although lithium-sulfur batteries have outstanding advantages, they also have some disadvantages; fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/10
Inventor 董伟玲陈宏伟王长虹卢威陈立桅
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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