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Preparation method and application method of self-supporting cathode with lithium ion conductivity

A conductive and self-supporting technology, applied in the direction of fuel cell half-cells and secondary battery-type half-cells, battery electrodes, electrical components, etc., can solve the problems of poor catalyst performance and less research, and achieve low cost, Inexpensive, improves uniform distribution

Active Publication Date: 2020-01-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, research on low-cost catalysts mainly focuses on transition metal atom cluster catalysts, macrocyclic compound catalysts containing transition metals in the center, and metal carbide catalysts; in addition, nitrides, sulfides, borides, and silicides are used as low-temperature fuels. Battery catalysts have also been reported, but the performance of these catalysts is relatively poor, and there are relatively few studies

Method used

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  • Preparation method and application method of self-supporting cathode with lithium ion conductivity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0037] Dissolve excess β-cyclodextrin in ethylene glycol at 90°C, take 1L of the supernatant (saturated solution of β-cyclodextrin), add 0.5g of ferrocene powder, mix with ultrasonic vibration for 30 minutes, and the ferrocene molecules enter The β-cyclodextrin cavity forms a ferrocene β-cyclodextrin inclusion compound, and after vacuum drying, the ferrocene β-cyclodextrin inclusion compound is obtained.

Embodiment 2

[0038] Embodiment 2: Precursor preparation

[0039] Dissolve excess β-cyclodextrin in ethylene glycol at 90°C, take 1L of the supernatant (saturated solution of β-cyclodextrin), add 5g of ferrocene powder, mix with ultrasonic vibration for 30 minutes, and the ferrocene molecules enter the β-cyclodextrin - The cyclodextrin cavity forms a ferrocene β-cyclodextrin inclusion compound, and after vacuum drying, the ferrocene β-cyclodextrin inclusion compound is obtained.

[0040] Dissolve 10g of soluble starch in 1L of boiling water, add 1g of the β-cyclodextrin clathrate of ferrocene above, stir to dissolve, add 10g of sodium chloride, stir and dissolve for 1h, cool to 35°C, pass the solution through a peristaltic pump, Dropped into a Dewar bottle filled with liquid nitrogen for flash freezing to obtain spherical particles, which were transferred to a lyophilized vacuum dryer for 24 hours to obtain a precursor.

Embodiment 3

[0041] Embodiment 3: integrated porous carbon material

[0042] Dissolve excess β-cyclodextrin in ethylene glycol at 90°C, take 1L of the supernatant (saturated solution of β-cyclodextrin), add 10g of ferrocene powder, mix with ultrasonic vibration for 30 minutes, and the ferrocene molecules enter the ring The dextrin cavity forms a ferrocene cyclodextrin inclusion compound, and after vacuum drying, the ferrocene cyclodextrin inclusion compound is obtained;

[0043] Dissolve 15g of soluble starch in 1L of boiling water, add 2.5g of the above-mentioned ferrocene cyclodextrin inclusion compound, stir to dissolve, add 25g of sodium chloride, stir and dissolve for 1h, cool to 35°C, pass the solution through a peristaltic pump, drop into Flash freezing was performed in a Dewar bottle filled with liquid nitrogen to obtain spherical particles, which were transferred to a freeze vacuum dryer for 24 hours to obtain a precursor.

[0044] The above precursor was heated to 900°C at a rat...

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Abstract

The invention relates to a metal-air battery technology, and aims to provide a preparation method and an application method of a self-supporting cathode with lithium ion conductivity. The preparationmethod comprises the following steps of: adding ferrocene powder into an ethylene glycol saturated solution of cyclodextrin, carrying out ultrasonic mixing, and carrying out vacuum drying to obtain aferrocene cyclodextrin inclusion compound; dissolving soluble starch in boiling water, adding the ferrocene cyclodextrin inclusion compound, performing stirring for dissolving, adding sodium chloride,and performing stirring for dissolving; carrying out flash freezing and drying to obtain a precursor; performing carbonizing in a nitrogen atmosphere to form a carbonized product; performing crushing, washing and suction filtration to obtain a filter cake of the porous catalyst; after drying, performing immersing in a perfluorosulfonic acid resin solution, performing airing, and then putting in aLiOH solution to boil; and performing rinsing and drying to obtain a self-supporting cathode with lithium ion conductivity. The iron-containing porous carbon has the characteristics of a large specific surface area and a large pore volume, and has better conductivity. The use amount of the binder is reduced, the electrode strength is effectively improved, meanwhile, high electrode conductivity iskept, and the cost is low.

Description

technical field [0001] The present invention relates to a kind of metal-air battery technology, more specifically, relates to a kind of based on ferrocene as transition metal source, soluble starch as carbon source, with salt as template, ferrocene and starch are modified by cyclodextrin The solution is flash-frozen, freeze-dried, carbonized, washed, and suction-filtered to obtain a filter cake to prepare a self-supporting positive electrode and its application in a metal-air battery. Background technique [0002] Fuel Cell (Fuel Cell) technology has achieved innovative breakthroughs, coupled with multiple pressures such as environmental protection issues and energy shortages, governments of various countries and industries such as automobiles, electric power, and energy are gradually paying attention to the development of fuel cell technology. Fuel cell is a new power generation technology with high efficiency, low pollution, and diversified energy sources. It uses fuels su...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/96H01M12/08
CPCH01M4/8825H01M4/8892H01M4/96H01M12/08Y02E60/10
Inventor 李洲鹏叶克份刘宾虹
Owner ZHEJIANG UNIV
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