Method for preparing ferrum electrode material of ferro-nickel rechargeable secondary battery

A secondary battery and iron electrode technology, applied in the field of preparation of rechargeable graphene-modified iron electrode materials

Inactive Publication Date: 2015-03-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is highly targeted and simple in principle, but the electrochemical activity of ferric oxide itself is poor, so the overall capacity of the prepared iron electrode is low

Method used

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  • Method for preparing ferrum electrode material of ferro-nickel rechargeable secondary battery

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Effect test

Embodiment 1

[0024] Weigh 9.6g FeCl 3 ·6H 2 O and 23.9g of sodium oleate were dissolved in a mixed solvent consisting of 20ml of absolute ethanol, 40ml of deionized water and 50ml of n-hexane, and kept in a constant temperature water bath at 85°C for 2h. Let it stand, and take the upper layer of reddish-brown iron-based oleate with a separatory funnel. Another 20 mg of heat-expandable graphene sheet was taken, added into a mixed solvent composed of 15 ml of oleylamine and 20 ml of toluene, and ultrasonicated for 12 hours. The mixture was centrifuged at 5000rpm to obtain oleylamine-modified graphene nanosheets. Dissolve 2g of iron-based oleate and 20mg of oleylamine-modified graphene nanosheets in 50ml of xylene, heat in a water bath at 80°C for 15min, then transfer to a reaction kettle, and react at 150°C for 10h. The product was washed with alcohol and water, and dried to obtain the iron electrode precursor composite of graphene sheets, which was heat-treated in a tube furnace at a rat...

Embodiment 2

[0026] Weigh 8.7g FeCl 3 ·6H 2 O and 55.6g of sodium oleate were dissolved in a mixed solvent consisting of 30ml of absolute ethanol, 60ml of deionized water and 100ml of n-hexane, and kept in a constant temperature water bath at 85°C for 2h. Let it stand, and take the upper layer of reddish-brown iron-based oleate with a separatory funnel. Another 10 mg of heat-expandable graphene sheet was taken, added into a mixed solvent composed of 10 ml of oleylamine and 20 ml of toluene, and ultrasonicated for 12 hours. The mixture was centrifuged at 5000rpm to obtain oleylamine-modified graphene nanosheets. Dissolve 2g of iron-based oleate and 10mg of oleylamine-modified graphene nanosheets in 50ml of xylene, heat in a water bath at 80°C for 15min, then transfer to a reaction kettle, and react at 150°C for 10h. The product is washed with alcohol and water, and dried to obtain an iron-electrode composite of graphene sheets without heat treatment.

Embodiment 3

[0028] Weigh 9.6g FeCl 3 ·6H 2 O and 24.8g of potassium oleate were dissolved in a mixed solvent composed of 20ml of absolute ethanol, 40ml of deionized water and 50ml of n-hexane, and kept in a constant temperature water bath at 75°C for 4h. Let it stand, and take the upper layer of reddish-brown iron-based oleate with a separatory funnel. Another 20 mg of heat-expandable graphene sheet was taken, added into a mixed solvent composed of 15 ml of oleylamine and 20 ml of toluene, and ultrasonicated for 12 hours. The mixture was centrifuged at 5000rpm to obtain oleylamine-modified graphene nanosheets. Weigh 1g of iron-based oleate, mix with 20mg of heat-expandable graphene sheets and 100ml of xylene, heat in a water bath at 80°C for 15min, then transfer to a reaction kettle, and react at 150°C for 12h. The product was washed with alcohol and water, and dried to obtain the iron electrode precursor composite of graphene sheets, which was heat-treated in a tube furnace at a rate ...

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Abstract

The invention provides a method for preparing a ferrum electrode material of a ferro-nickel rechargeable secondary battery. The method comprises the following steps: dissolving ferric salt and oleate according to a substance ratio of (1:1)-(1:10) in a mixed solvent of absolute ethyl alcohol, deionized water and aliphatic hydrocarbon, thereby obtaining an oleic acid iron-based compound; dispersing expanded graphite carbon powder in a mixed solvent of oleylamine and aromatic hydrocarbon according to a volume ratio of (1:1)-(1:10), thereby obtaining oleylamine modified nano graphene sheets; dissolving the compound and the nano graphene sheets in the aromatic hydrocarbon, and drying after treatment, thereby obtaining a ferrum electrode precursor compound containing the graphene sheets; heating in a tubular furnace at a rate of 1 to 20 DEG C per minute under the inert gas or nitrogen protection, and performing heat treatment; and naturally cooling to room temperature, thereby obtaining the graphene sheet modified iron electrode material for the ferro-nickel rechargeable secondary battery. According to the method disclosed by the invention, the ferrum electrode of the ferro-nickel rechargeable secondary battery has excellent quick charge and discharge performance, the operation process is simple, the repeatability is high, the material test effect is obvious, and the commercial popularization and application are promoted.

Description

technical field [0001] The invention belongs to the field of electrode materials, in particular to a method for preparing a chargeable graphene-modified iron electrode material. Background technique [0002] Nickel-iron batteries were invented over a century ago, and traditional nickel-iron batteries are often used as backup batteries. Its main feature is that it can work in a very harsh environment, and the battery has a long service life. However, because the iron electrode forms a dense passivation film during discharge, it is difficult to charge the nickel-iron battery, and it can only be used repeatedly under low current conditions. In addition, the hydrogen evolution is serious during charging, making the charge and discharge efficiency of the iron electrode extremely low. Therefore, improving the interfacial charge transport performance of iron electrodes becomes the key to enhance the competitiveness of nickel-iron rechargeable secondary batteries. [0003] The pat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52H01M10/24
CPCH01M4/52H01M10/30Y02E60/10
Inventor 刘洪涛洪诗雨唐有根
Owner CENT SOUTH UNIV
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