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Preparation method and application of Fe2O3 nanorod array electrode in-situ vulcanization and carbon coating

A nanorod array, carbon coating technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of loss of passivation, irreversible loss of sulfur ions, etc.

Active Publication Date: 2019-03-29
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the sulfur ions decomposed from the sulfide added by the physical mixing method will also migrate to the nickel positive electrode and be oxidized into sulfate ions while interacting with the passivation film, causing irreversible loss of sulfur ions, making it quickly lose depassivation effect

Method used

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  • Preparation method and application of Fe2O3 nanorod array electrode in-situ vulcanization and carbon coating
  • Preparation method and application of Fe2O3 nanorod array electrode in-situ vulcanization and carbon coating
  • Preparation method and application of Fe2O3 nanorod array electrode in-situ vulcanization and carbon coating

Examples

Experimental program
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Effect test

Embodiment 1

[0027]The first step: Weigh 2.5mmol ferric chloride and dissolve it in 50mL deionized water, obtain a transparent solution under the action of ultrasound, then slowly add 2.5mmol sodium sulfate under magnetic stirring, and after it is completely dissolved, dissolve the solution Pour into a 50mL polytetrafluoroethylene liner. Put a 3cm×5cm titanium sheet into a polytetrafluoroethylene liner filled with the solution, seal it with a stainless steel jacket, put it in a constant temperature drying oven at 180°C, and keep it warm for 6h. After the reaction kettle was lowered to room temperature, the Ti sheet was taken out, the surface of the Ti sheet was washed repeatedly with deionized water, and dried under natural conditions, then put into a muffle furnace for sintering. From room temperature to 100°C, keep for 2h; within 3h, increase the temperature from 100°C to 300°C, and keep for 2h; within 3h, increase the temperature from 300°C to 450°C, and keep for 2h; naturally cool to g...

Embodiment 2

[0035] Compared with Example 1, except that the vulcanizing agent (thioacetamide 2mmol) in the second step is different, all the other are the same as Example 1

Embodiment 3

[0037] Compared with Example 1, except that vulcanizing agent (thioacetamide 5mmol) is different in the second step, all the other are the same as Example 1 Example 4

[0038] Compared with Example 1, except that the vulcanization time (1h) is different in the second step, all the other are the same as Example 1.

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Abstract

The invention discloses a method for preparing Fe2O3 nano-rod array electrodes by means of in-situ vulcanization and carbon coating and application of the Fe2O3 nano-rod array electrodes. The method includes sintering titanium sheets, iron chloride and sodium sulfate by a hydrothermal synthesis process to obtain nano-rod-shaped Fe2O3 arrays; vulcanizing iron sesquioxide by the aid of thiourea or thioacetamide by solvothermal process to obtain Fe2O3-S; carrying out carbon coating on the Fe2O3-S by plasma-enhanced chemical vapor deposition process to obtain Fe2O3-S@C. The titanium sheets are used as a substrate, the iron chloride is used as an iron source, and the sodium sulfate is used as a precipitator. The thiourea or the thioacetamide is used as a vulcanizing agent. The method and the application have the advantages that the maximum capacity of original Fe2O3 electrodes in 1M KOH electrolyte is only 13.67 mAh / g, can be improved to reach 214.3 mAh / g after the Fe2O3 electrodes are vulcanized, and can reach 768.3 mAh / g after carbon coating optimization is carried out on the Fe2O3 electrodes; the capacity retention rate of the Fe2O3-S is only 7.95% after the Fe2O3-S is cycled by 100 times, and the capacity retention rate of the Fe2O3-S@C can reach 92.13%.

Description

technical field [0001] The invention belongs to the field of alkaline secondary batteries, in particular to a 2 o 3 A preparation method for in-situ vulcanization and carbon coating modification of a nanorod array electrode to improve its energy storage performance. Background technique [0002] Due to the advantages of safety, environmental protection, low cost and long service life, nickel-iron alkaline secondary batteries have been considered as one of the competitive chemical power sources since Edison and Jongener invented them successively from 1899 to 1902. countries' attention. From 1910 to 1960, nickel-iron batteries were all the rage and were widely used in traction locomotive power supplies and other fields. Later, with the continuous development and application of internal combustion engines, the impact of large-scale application of lead-acid batteries and nickel-cadmium batteries, and the successive development and application of high specific power nickel-hy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/52H01M4/58H01M4/587H01M4/36H01M10/24
CPCH01M4/366H01M4/52H01M4/5815H01M4/587H01M10/24Y02E60/10
Inventor 肖婷李锦谭新玉向鹏姜礼华
Owner CHINA THREE GORGES UNIV
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