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Mesoporous silica/carbon-sulfur compound for lithium sulphur battery cathode and its preparation method

A technology of mesoporous silicon oxide and sulfur-carbon composites, which is applied in the field of nanocomposite materials and its preparation, can solve the problems of unfavorable fast charging and discharging, and achieve the effects of reducing shuttle effect, low production cost and simple preparation process

Active Publication Date: 2017-12-01
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problem that the weakly conductive metal oxide in the existing method will increase the impedance of the overall electrode, which is not conducive to rapid charge and discharge, and provides a mesoporous silicon oxide / sulfur oxide for the positive electrode of lithium-sulfur batteries. Carbon composite and its preparation method

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  • Mesoporous silica/carbon-sulfur compound for lithium sulphur battery cathode and its preparation method
  • Mesoporous silica/carbon-sulfur compound for lithium sulphur battery cathode and its preparation method
  • Mesoporous silica/carbon-sulfur compound for lithium sulphur battery cathode and its preparation method

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specific Embodiment approach 1

[0048] Specific Embodiment 1: The mesoporous silicon oxide / sulfur-carbon composite used for the positive electrode of the lithium-sulfur battery in this embodiment is composed of mesoporous silicon oxide, elemental sulfur and carbon materials, and the elemental sulfur occupies the mesoporous oxidation of the positive electrode of the lithium-sulfur battery. 10% to 80% of the total mass of the silicon / sulfur-carbon composite.

specific Embodiment approach 2

[0049] Specific embodiment two: the preparation method of the mesoporous silicon oxide / sulfur-carbon composite used for the positive electrode of lithium-sulfur battery described in specific embodiment one:

[0050] 1. Preparation of silica-sulfur complex:

[0051] Mix sublimated sulfur and mesoporous silicon oxide according to the mass ratio of (10~1):1, under the protection of nitrogen or argon atmosphere, keep warm for 6h~20h at a temperature of 158°C~160°C, and then raise the temperature to 250°C ℃~300℃ and continue to keep warm for 0.5h~3h to obtain silicon oxide sulfur compound;

[0052] 2. Disperse the silica-sulfur complex obtained in step 1 in water, stir and disperse it with magnetic force, add it into the aqueous solution of carbon material with a concentration of 1 mg / mL, continue stirring for 12 to 48 hours, precipitate, centrifuge, wash, and dry, that is Obtained mesoporous silicon oxide / sulfur-carbon composites for lithium-sulfur battery cathodes.

specific Embodiment approach 3

[0053] Embodiment 3: This embodiment differs from Embodiment 2 in that the mass content of sulfur in the silica-sulfur composite obtained in step 1 is 10-80%. Others are the same as in the second embodiment.

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Abstract

The invention discloses a mesoporous silica / carbon-sulfur compound for lithium sulphur battery cathode and its preparation method, and relates to a nanometer composite material and its preparation method, aiming to solve the technical problem that metal oxide with weak conductivity in the existing method can improve the impedance of the whole electrode and accordingly is not good for the rapid charge and discharge. The mesoporous silica / carbon-sulfur compound for lithium sulphur battery cathode is prepared from mesoporous silica, elemental sulfur and carbon material. The method includes steps of preparing sulphur silicon oxide composite, and dispersing the sulphur silicon oxide composite in the water; after magnetically stirring and dispersing, adding to water solution of a carbon material with concentration of 1 mg / mL; continuing to stir for 12-48 hours; settling, centrifuging, washing and drying the solution to obtain the mesoporous silica / carbon-sulfur compound for lithium sulphur battery cathode. The power is discharged at 0.1C, the top discharge capacity is up to 1625 mAhg<-1>; after the circulation for 500 circles, the compound still can keep about 1000 mAhg <-1>.

Description

technical field [0001] The invention relates to a nanocomposite material and a preparation method thereof, in particular to a mesoporous silicon oxide / sulfur carbon composite suitable for the positive electrode of a lithium-sulfur battery and a preparation method thereof. Background technique [0002] Most of the energy demand in the world still depends on petroleum fuels, but the thermal efficiency of petroleum fuels is not only very low, but also causes environmental pollution, global warming, greenhouse effect and other problems. These issues are the focus of attention of various countries at present, and various countries have promulgated relevant regulations to limit exhaust emissions to protect the environment. At present, transportation is the main source of energy consumption and the biggest cause of air pollution. Although the emission of toxic gases and dust particles in modern automobiles has been greatly reduced compared with traditional automobiles, this reduct...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01M4/362H01M4/366H01M4/38H01M4/625H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 黄小萧潘虹温广武钟博夏龙张涛张晓东
Owner HARBIN INST OF TECH
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