Preparation of modified porous carbon materials based on cobaltocene and their application in lithium-sulfur batteries

A porous carbon material, cobaltocene technology, applied in lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of not eliminating the source of lithium dendrites and delaying the occurrence of lithium dendrites.

Active Publication Date: 2020-10-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the coating of traditional carbon materials only delays the occurrence of lithium dendrites, but does not eliminate the root of the lithium dendrite problem.

Method used

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  • Preparation of modified porous carbon materials based on cobaltocene and their application in lithium-sulfur batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Preparation of β-cyclodextrin inclusion compound of cobaltocene

[0037] Take 1L of the ethylene glycol saturated solution of β-cyclodextrin, add 0.5g of cobaltocene powder, and mix with ultrasonic vibration at 90°C for 30 minutes, the cobaltocene molecules enter the cavity of the cyclodextrin to form the cobaltocene package in the cyclodextrin Compound, after vacuum drying, dicyclocene cobalt dextrin clathrate was obtained.

Embodiment 2

[0038] Embodiment 2: Precursor solution preparation

[0039] Take 1L of ethylene glycol saturated solution of β-cyclodextrin, add 5g of cobaltocene powder, and mix with ultrasonic vibration at 90°C for 30 minutes, cobaltocene molecules enter the cyclodextrin cavity to form cobaltocene cyclodextrin inclusion compound , and vacuum-dried to obtain dicyclocene-cobalt cyclodextrin inclusion compound.

[0040] Add 10 g of hemicellulose to 1 L of boiling water, stir and add 10 g of sodium hydroxide, wait until the hemicellulose is completely dissolved, then add 1 g of the above-mentioned cobalt dicyclodextrin inclusion compound, stir and dissolve for 1 h to obtain a black solution.

Embodiment 3

[0041] Embodiment 3: Precursor preparation

[0042] Take 1L of ethylene glycol saturated solution of β-cyclodextrin, add 10g of cobaltocene powder, and mix with ultrasonic vibration at 90°C for 30 minutes, the cobaltocene molecules enter the cavity of cyclodextrin to form cobaltocene inclusion complex , after vacuum drying, dicyclocene cobalt cyclodextrin inclusion compound was obtained.

[0043] Add 15g of hemicellulose to 1L of boiling water, stir and add 30g of sodium hydroxide. After the hemicellulose is completely dissolved, add 2.5g of the above-mentioned cobalt dicyclodextrin inclusion compound, stir and dissolve for 1 hour to obtain a black solution. Immerse the foamed nickel and cool it to 35°C, a black gel is formed in the pores of the foamed nickel. Moved to freeze dryer, dried for 12h to obtain the precursor.

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Abstract

The invention relates to a lithium-sulfur battery technology, and aims to provide preparation of a cobaltocene-based modified porous carbon material and application of the cobaltocene-based modified porous carbon material in a lithium-sulfur battery. The preparation method comprises the following steps: adding cobalt dicyclopentadienyl powder into an ethylene glycol saturated solution of cyclodextrin, ultrasonically mixing and drying to obtain a cobalt dicyclopentadienyl cyclodextrin inclusion compound; adding hemicellulose into boiling water, and adding sodium hydroxide; completely dissolving, adding a cobaltocene cyclodextrin inclusion compound, and stirring for dissolving to obtain a black solution; immersing foamed nickel, cooling, transferring to a freeze dryer, and drying to obtain aprecursor; carbonizing the precursor under the protection of a nitrogen atmosphere, washing with deionized water to remove sodium hydroxide, drying, carbonizing at constant temperature, cooling to room temperature, and immersing in a hydrochloric acid solution to remove a foamed nickel skeleton; and washing and drying to obtain the integrated modified porous carbon material. The preparation method has the characteristics of environmental friendliness in synthesis method and low cost. The obtained cobalt-containing porous carbon has the characteristics of large specific surface area and largepore volume, wherein cobalt becomes a lithium intercalation center and a polysulfide adsorption center.

Description

technical field [0001] The invention relates to a lithium-sulfur battery technology, and more specifically, relates to an integrated modified porous carbon material using cobaltocene as a modifier and a preparation method for the lithium-sulfur battery. Background technique [0002] Lithium-sulfur batteries use elemental sulfur and metallic lithium as positive and negative active materials, and realize the mutual conversion of electrical energy and chemical energy through the chemical reaction of lithium and sulfur. The mass energy density of the assembled battery can reach 2500Wh kg -1 , far larger than the lithium-ion batteries currently in use, which means that lithium-sulfur batteries of the same quality can provide greater energy, make up for the shortcomings of lithium-ion batteries with low energy density, and provide a basis for improving the mileage and driving performance of electric vehicles . Compared with the positive electrode material of lithium-ion batteries...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H01M4/66H01M4/80H01M10/052
CPCH01M4/663H01M4/665H01M4/80H01M10/052Y02E60/10
Inventor李洲鹏刘宾虹
OwnerZHEJIANG UNIV