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A method for preparing a composite material for a positive electrode of a lithium sulfide battery

A lithium-sulfur battery and composite material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of reducing active materials, affecting electronic conduction, and destroying the structure of positive electrode materials

Active Publication Date: 2018-12-07
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, there are still many problems that need to be solved in the application of lithium-sulfur batteries. First, during the charging and discharging process of lithium-sulfur batteries, part of lithium polysulfide will dissolve in the electrolyte and move repeatedly between the positive and negative electrodes. Side reactions will occur, deposited on the lithium sheet, forming a "shuttle effect", resulting in irreversible reduction of active materials, capacity decay, and reduced battery cycle stability
Second, elemental sulfur has poor conductivity, which seriously affects electron conduction during charge and discharge.
Third, during the charge and discharge process of lithium-sulfur batteries, the sulfur element will undergo a chemical reaction to generate Li 2 S 6 ,The volume expansion can reach 80%, resulting in the destruction of the structure of the positive electrode material and reducing the cycle stability of the battery

Method used

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  • A method for preparing a composite material for a positive electrode of a lithium sulfide battery
  • A method for preparing a composite material for a positive electrode of a lithium sulfide battery
  • A method for preparing a composite material for a positive electrode of a lithium sulfide battery

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Embodiment 1

[0025] A kind of S@TiO 2 / MXene material, its preparation method comprises the following steps:

[0026] 1) Dissolve 300mg of resorcinol-formaldehyde resin pellets with a particle size of 350nm in 40ml of absolute ethanol, disperse ultrasonically for 15min, add hexadecyltrimethylammonium bromide (0.6mmol / l) and stir to modify the surface After stirring for 2 hours, centrifuge and wash with absolute ethanol, then dissolve the modified resorcinol-formaldehyde resin pellets in 40ml of absolute ethanol, and finally drop 0.3ml of butyl titanate slowly, stir for 12h, centrifuge After washing, dry at 60°C, put it into a muffle furnace for calcination at a constant temperature of 550°C for 3 hours, and obtain a white solid;

[0027] 2) Mix 20 mg of the white solid obtained in step 1) with 140 mg of sublimed sulfur, soak in 10 ml of carbon disulfide solution (3 mg / ml) for 3 minutes, stir for 3 hours until the carbon disulfide is completely volatilized, and then put it into a polytetra...

Embodiment 2

[0033]1) Dissolve 300mg of resorcinol-formaldehyde resin pellets with a particle size of 500nm in 40ml of absolute ethanol, disperse ultrasonically for 15min, add cetyltrimethylammonium bromide (0.6mmol / l) and stir to modify the surface After stirring for 2 hours, centrifuge and wash with absolute ethanol, then dissolve the modified resorcinol-formaldehyde resin pellets in 40ml of absolute ethanol, and finally slowly drop in 0.4ml of butyl titanate, stir for 12h, centrifuge After washing, dry at 60°C, put it into a muffle furnace for calcination at a constant temperature of 550°C for 3 hours, and obtain a white solid;

[0034] 2) Mix 20 mg of the white solid obtained in step 1) with 140 mg of sublimed sulfur, soak in 10 ml of carbon disulfide solution (3 mg / ml) for 3 minutes, stir for 3 hours until the carbon disulfide is completely volatilized, and then put it into a polytetrafluoroethylene reactor under an argon atmosphere Sealed in the middle, heated for melting reaction (r...

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Abstract

The invention provides a preparation method of an S@TiO2 / Ti2C composite material used for a lithium sulfur battery positive electrode, in particular comprising the steps of: using resorcinol; Formaldehyde resin spheres were prepared by coating resorcinol with butyl titanate. TiO2 hollow spheres were obtained by calcination of formaldehyde resin spheres. S @ TiO2 composite structure was obtained bya hot melting method. Ti2C was obtained by etching MXene material with hydrofluoric acid. S @ TiO2 and Ti2C were adsorbed in vacuum to form S @ TiO2 / Ti2C composite structure. The structure can effectively adsorb the polysulfide formed during the charge-discharge reaction of lithium sulfide battery, alleviate the volume expansion caused by S material, and improve the electrochemical performance oflithium sulfide battery.

Description

technical field [0001] The invention relates to a lithium-sulfur battery cathode modified material, a preparation method and application thereof, and belongs to the technical field of battery materials. Background technique [0002] With the continuous development of electronic technology, electronic devices such as mobile phones, computers, and electric vehicles have put forward higher requirements for power supplies. The energy density of lithium-ion batteries is not enough to meet market requirements. People need power supplies with higher specific capacity and higher energy density. To support the development of high-tech industries, the theoretical specific capacity of sulfur is 1675mAh / g, and the theoretical specific energy of lithium-sulfur batteries is 2600wh / kg, which is much higher than the theoretical specific energy of commercial lithium batteries (360wh / kg). Moreover, the raw materials of sulfur are abundant, low in price, non-polluting to the environment, and h...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/58
CPCH01M4/364H01M4/38H01M4/485H01M4/58Y02E60/10
Inventor 武军杜昌李双洋徐军明宋开新
Owner HANGZHOU DIANZI UNIV
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