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A kind of sodium manganate/graphene composite electrode material and its preparation method and application

A graphene composite and electrode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of unsatisfactory cycle performance and low oxide activity, and achieve the improvement of electrochemical activity, reduction of side reactions, and prevention of dissolution. Effect

Active Publication Date: 2020-11-03
SHANGHAI HANHANG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Layered manganese oxides have received widespread attention due to their low price, easy synthesis, and high theoretical capacity, but their activity is low and their cycle performance is not ideal.

Method used

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  • A kind of sodium manganate/graphene composite electrode material and its preparation method and application
  • A kind of sodium manganate/graphene composite electrode material and its preparation method and application
  • A kind of sodium manganate/graphene composite electrode material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Press Na 0.7 MnO 2 f 0.05 The target product, the stoichiometric ratio of MnO 2 , NaF and Na 2 CO 3 (Na 2 CO 3 Excessive 2.5%) through dry vibration ball milling for 60 minutes, the vibration frequency is 20Hz, and then the powder is pressed into a block under a pressure of 2MPa; The heating rate was raised to 500°C, and pre-fired at 500°C for 5 hours, and then cooled to room temperature with the furnace; after the preliminary grinding of the pre-calcined product obtained above, the second vibration ball milling was carried out for 60 minutes, the vibration frequency was 20Hz, and then Press the powder into a block under pressure; place the pre-fired block above in a tube furnace, raise the temperature to 850°C at a heating rate of 5°C / min in an air atmosphere, and burn at 850°C for 12 hours, then Cool to room temperature with the furnace; mix the above-mentioned graphene and fluorine-doped sodium manganate particles at a weight ratio of 1:10, and perform the thi...

Embodiment 2

[0043] Press Na 0.7 MnO 1.95 f 0.1 The target product, the stoichiometric ratio of MnO 2 , NaF and Na 2 CO 3 (Na 2 CO 3 Excessive 2.5%) through dry vibration ball milling for 60 minutes, the vibration frequency is 20Hz, and then the powder is pressed into a block under a pressure of 2MPa; The heating rate was raised to 500°C, and pre-fired at 500°C for 5 hours, and then cooled to room temperature with the furnace; after the preliminary grinding of the pre-calcined product obtained above, the second vibration ball milling was carried out for 60 minutes, the vibration frequency was 20Hz, and then Press the powder into a block under pressure; put the above-mentioned pre-calcined block in a tube furnace, raise the temperature to 800°C at a heating rate of 5°C / min in an air atmosphere, and burn at 800°C for 15 hours, then Cool to room temperature with the furnace; mix the above-mentioned graphene and fluorine-doped sodium manganate particles at a weight ratio of 1:8, and per...

Embodiment 3

[0045] Press Na 0.7 MnO 1.90 f 0.15 The target product, the stoichiometric ratio of MnO 2 , NaF and Na 2 CO 3 (Na 2 CO 3 Excessive 2.5%) through dry vibration ball milling for 60 minutes, the vibration frequency is 20Hz, and then the powder is pressed into a block under a pressure of 2MPa; The heating rate was raised to 500°C, and pre-fired at 500°C for 5 hours, and then cooled to room temperature with the furnace; after the preliminary grinding of the pre-calcined product obtained above, the second vibration ball milling was carried out for 60 minutes, the vibration frequency was 20Hz, and then Press the powder into a block under pressure; put the above-mentioned pre-calcined block in a tube furnace, raise the temperature to 900°C at a heating rate of 5°C / min in an air atmosphere, and burn at 900°C for 10 hours, then Cool to room temperature with the furnace; mix the above-mentioned graphene and fluorine-doped sodium manganate particles at a weight ratio of 1:12, perfo...

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Abstract

The invention discloses a sodium manganate / graphene composite electrode material, a preparation method therefor and an application. The composite electrode material comprises graphene and sodium manganate particles. The surface of the sodium manganate particle is completely coated with the graphene, and a plurality of sodium manganate particles are interlinked through the graphene so as to be assembled into composite material particles. The sodium manganate / graphene composite electrode material preparation method comprises the following steps: performing dry oscillation ball milling on MnO2, NaF and Na2CO3; performing reacting under a high temperature air atmosphere to obtain fluorine-doped sodium manganate; and performing graphene coating on the surface and assembling to obtain the sodiummanganate / graphene composite material with a micro-nano structure. According to the sodium manganate / graphene composite electrode material, preparation method therefor and application, the preparation method is simple and controllable in process, low in energy consumption and low in cost, and is suitable for large-scale industrial production. The result shows that the prepared sodium manganate / graphene composite material with the micro-nano structure has high capacity and can be applied to the field of sodium ion batteries.

Description

technical field [0001] The invention relates to the technical field of electrode materials for sodium ion batteries, and relates to a sodium manganate / graphene composite electrode material and a preparation method and application thereof. Background technique [0002] With the development of society and economy, energy consumption is increasing day by day, traditional fossil energy continues to decrease, and human consumption of traditional fossil energy has caused serious environmental pollution. Under this environment, clean, renewable and cheap new energy It has become the object of development by governments of various countries. At present, the proportion of wind energy, solar energy and ocean energy in energy consumption is constantly increasing. However, these renewable energy sources are greatly affected by weather and time periods, and are obviously unstable, discontinuous and irresistible. control characteristics, it is necessary to develop and build supporting ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/62H01M10/054
CPCH01M4/366H01M4/505H01M4/625H01M4/628H01M10/054Y02E60/10
Inventor 石坚
Owner SHANGHAI HANHANG TECH CO LTD
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