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Preparation method for novel graphene catalyst used for metal air battery electrode

A metal-air battery and graphene technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as low performance, poor conductivity of air batteries, and high-current discharge and heat generation of batteries

Active Publication Date: 2016-06-15
临沂星火知识产权服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing air battery graphene catalyst preparation methods have problems of low efficiency, high cost, low yield, and low performance. How to prepare a high-efficiency graphene catalyst to improve air battery poor conductivity, low catalytic efficiency, and battery The problem of high current discharge heating is urgently needed to be solved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] (1) Preparation of graphene oxide: adopt 25ml of concentrated sulfuric acid with a volume fraction of more than 98%, add 1g of potassium nitrate, stir in an ice bath, add 2g of graphite and stir in an ice bath for 30min, slowly add 20g of 50wt% potassium permanganate aqueous solution, ice Stir in a bath for 30 minutes, transfer to a 20°C water bath and stir for 30 minutes, slowly add 200ml of deionized water, transfer to a 90°C water bath and stir for 10 minutes, then slowly add 500ml of deionized water and 40ml of 20% hydrogen peroxide and stir for 10 minutes. Until the color of the mixture turns bright yellow, the mixture is centrifuged and washed to neutrality, and the graphene oxide powder is obtained after drying.

[0011] (2) Graphene / LaNiO 3 Composite catalyst preparation: LaNO 3 Powder and NiO 3 Mix the powder into a mixture at a ratio of 1:1, add 5g of the mixture into 200ml of 50wt% malic acid aqueous solution, stir well to dissolve the powder, and then stor...

Embodiment 2

[0014] (1) Graphene oxide preparation: adopt the concentrated sulfuric acid of the volume fraction more than 98% of 50ml, add 1.5g potassium nitrate, stir in ice bath, add 2g graphite ice bath and stir for 45min, slowly add 25g of 50wt% potassium permanganate aqueous solution, Stir in an ice bath for 45 minutes, transfer to a 25°C water bath and stir for 45 minutes, slowly add 200ml of deionized water, transfer to a 100°C water bath and stir for 20 minutes, then slowly add 500ml of deionized water and 40ml of 25% hydrogen peroxide and stir for 10 minutes. Until the color of the mixture turns bright yellow, the mixture is centrifuged and washed to neutrality, and the graphene oxide powder is obtained after drying.

[0015] (2) Graphene / LaNiO 3 Composite catalyst preparation: LaNO 3 Powder and NiO 3 Mix the powder into a mixture at a ratio of 1:1, add 5g of the mixture into 200ml of 50wt% malic acid aqueous solution, stir well to dissolve the powder, and then store the solutio...

Embodiment 3

[0018] (1) Graphene oxide preparation: adopt the concentrated sulfuric acid of the volume fraction more than 98% of 100ml, add 2g potassium nitrate, stir in ice bath, add 2g graphite ice bath and stir for 60min, slowly add 50wt% potassium permanganate aqueous solution 30g, ice Stir in a bath for 60 minutes, transfer to a 30°C water bath and stir for 60 minutes, slowly add 200ml of deionized water, transfer to a 110°C water bath and stir for 30 minutes, then slowly add 500ml of deionized water and 40ml of 30% hydrogen peroxide and stir for 10 minutes. Until the color of the mixture turns bright yellow, the mixture is centrifuged and washed to neutrality, and the graphene oxide powder is obtained after drying.

[0019] (2) Graphene / LaNiO 3 Composite catalyst preparation: LaNO 3 Powder and NiO 3 Mix the powder into a mixture at a ratio of 1:1, add 5g of the mixture into 200ml of 50wt% malic acid aqueous solution, stir well to dissolve the powder, and then store the solution in ...

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PUM

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Abstract

The invention relates to a preparation method for a novel graphene catalyst used for a metal air battery electrode. The preparation method is characterized by comprising the steps of (1) preparation of graphene oxide: adopting concentrated sulfuric acid, adding potassium nitrate, adding graphite to ice bath for stirring, slowly adding a potassium permanganate water solution, centrifuging and washing the mixture until the mixture becomes neutral, and drying the mixture to obtain the graphene oxide powder; and (2) preparation of graphene / LaNiO3 composite catalyst: mixing LaNO3 powder with NiO3 powder to obtain a mixture, adding the mixture to a malic acid water solution, performing vacuum drying on the solution, heating the precursor powder at a high temperature to obtain the LaNiO3 powder; uniformly mixing the graphene oxide powder with the LaNiO3 powder based on a certain proportion to obtain mixed powder; slowly adding the mixed powder to distilling water, adjusting the pH value, and slowly adding Na-CMC to form gel-shaped object that is the graphene / LaNiO3 composite catalyst. The preparation method has the beneficial effects of high efficiency, low cost and high production rate; the graphene catalyst has high conductivity and the prepared battery shows high thermal dissipation under a high-current state.

Description

technical field [0001] The invention relates to the field of air battery electrode preparation, in particular to a method for preparing a novel metal-air battery electrode graphene catalyst. Background technique [0002] With the development of industry and the increasing activity of human activities, human consumption of energy is increasing day by day, while underground non-renewable resources are becoming increasingly scarce, and the contradiction between energy supply and demand is increasingly intensified. Energy issues have become one of the key issues affecting human survival and development. Air batteries have the advantages of high energy density, light system, non-toxic, non-polluting, and low price, and have great application prospects. However, due to catalyst activity, stability, and cost issues, air batteries are currently difficult to meet the requirements of commercial applications. Catalyst support or improved support structure is beneficial to improve catal...

Claims

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Application Information

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IPC IPC(8): H01M4/90
CPCH01M4/9016H01M4/9083Y02E60/50
Inventor 车春玲
Owner 临沂星火知识产权服务有限公司