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Stannic oxide/carbonized aerogel core-shell structure composite sulfur electrode material, and preparation method and application thereof

A technology of core-shell structure and carbonized gas, which is applied to battery electrodes, structural parts, circuits, etc., can solve the problems of poor cycle stability of lithium-sulfur batteries, achieve good cycle stability, improve electrical conductivity, and achieve effective transmission effects

Active Publication Date: 2019-05-31
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to improve the conductivity of sulfur electrodes and solve the problem of poor cycle stability of lithium-sulfur batteries, the present invention provides a tin oxide / carbide airgel core-shell structure composite sulfur electrode material and its preparation method and application

Method used

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  • Stannic oxide/carbonized aerogel core-shell structure composite sulfur electrode material, and preparation method and application thereof
  • Stannic oxide/carbonized aerogel core-shell structure composite sulfur electrode material, and preparation method and application thereof
  • Stannic oxide/carbonized aerogel core-shell structure composite sulfur electrode material, and preparation method and application thereof

Examples

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Embodiment 1

[0046] A tin oxide / carbonized airgel core-shell structure composite sulfur electrode material, the shell layer of the electrode material is tin oxide, the core layer is carbonized airgel microspheres, and monomeric sulfur is uniformly dispersed in the carbonized airgel microspheres The mass of monomeric sulfur accounts for 60-80% of the total mass of the core-shell structure composite sulfur electrode material.

[0047] In this embodiment, the monomeric sulfur is evenly dispersed in the carbonized airgel microspheres, and the conductivity of the sulfur electrode is improved through the compounding of the monomeric sulfur and the carbonized aerogel, and the carbonized aerogel can also inhibit the electrochemical reaction of sulfur. The volume expansion during the reaction prevents the structure of the electrode material from being destroyed; the tin oxide shell layer confines sulfur in the carbonized airgel core layer, which can inhibit the seepage of sulfur during charge and di...

Embodiment 2

[0049] A tin oxide / carbonized airgel core-shell structure composite sulfur electrode material, the shell layer of the electrode material is tin oxide, the core layer is carbonized airgel microspheres, and monomeric sulfur is uniformly dispersed in the carbonized airgel microspheres Inside, the mass of monomeric sulfur accounts for 65% of the total mass of the core-shell structure composite sulfur electrode material.

[0050] In this embodiment, the thickness of the tin oxide shell layer is 5-15 nm, and the diameter of the carbonized airgel microspheres is 1-2 μm.

Embodiment 3

[0052] The preparation method of a tin oxide / carbide aerogel core-shell structure composite sulfur electrode material provided in this example, the steps are as follows:

[0053] Step 1. Synthesis of carbonized airgel microspheres

[0054] Mix resorcinol, formaldehyde and water according to a certain molar volume ratio, add a certain mass of catalyst to the mixing system and mix to obtain a suspension; place the suspension at a certain temperature for aging treatment for a certain period of time, collect The precipitate in the suspension is washed with absolute ethanol and dried; the dried precipitate is placed in an inert gas atmosphere and calcined at a certain temperature for a certain period of time to obtain a carbonized gas with a certain spherical diameter gel microspheres;

[0055] Step 2. Preparation of tin oxide / carbonized airgel core-shell microspheres

[0056] Put the carbonized airgel microspheres prepared in step 1 into the acid solution for surface activation;...

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Abstract

The invention relates to a stannic oxide / carbonized aerogel core-shell structure composite sulfur electrode material, and a preparation method and application thereof, and belongs to the technical field of lithium-sulfur battery electrode materials. In order to improve the conductivity of a sulfur electrode and solve the poor cycle stability of a lithium-sulfur battery, the electrode material provided by the invention has a shell layer made of stannic oxide and a core layer made of carbonized aerogel microspheres. The monomer sulfur is uniformly dispersed in the carbonized aerogel microsphere,and the mass of sulfur accounts for 60-80% of the total mass of the core-shell structure composite sulfur electrode material. The method improves the conductivity of the sulfur electrode and inhibitsthe volume expansion of sulfur in a reaction process. The stannic oxide shell layer limits the sulfur in the carbonized aerogel core layer to inhibit the leakage of the sulfur, so that the compositesulfur electrode material can maintain good cycle stability during a charge-discharge process. The stannic oxide / carbonized aerogel core-shell structure composite sulfur electrode material provided bythe invention, when applied to the lithium-sulfur battery, can improve the service life and the capacity retention rate of the battery.

Description

technical field [0001] The invention belongs to the technical field of electrode materials for lithium-sulfur batteries, and in particular relates to a tin oxide / carbonized airgel core-shell structure composite sulfur electrode material and its preparation method and application. Background technique [0002] The widespread use of large-scale energy storage devices and electric vehicles requires further improvements in the field of rechargeable batteries to achieve higher energy densities. However, commercially widely used lithium batteries using graphite as the anode material are almost close to their theoretical energy density of 372mAh g -1 , unable to meet the needs of lithium-ion batteries for higher energy density and power density. [0003] Lithium-sulfur batteries are attracting more and more attention due to their high theoretical specific energy density, with a theoretical capacity of 1675mAh g -1 , 3 to 5 times higher than lithium-ion batteries. In lithium-sulf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCY02E60/10
Inventor 陈明华亓美丽陈庆国
Owner HARBIN UNIV OF SCI & TECH
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