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Vanadium manganese sodium phosphate @ 3D porous graphene composite material, preparation method thereof, and applications of vanadium manganese sodium phosphate @ 3D porous graphene composite material in sodium-ion batteries

A technology of sodium vanadium manganese phosphate and porous graphene, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems affecting rate performance and capacity, poor electronic conductivity of vanadium manganese sodium phosphate, etc., and improve load stability. , Improve the crystal structure, the effect of good load stability

Inactive Publication Date: 2017-07-28
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the factor limiting the development of sodium vanadium manganese phosphate comes from its own poor electronic conductivity, which seriously affects its rate performance and capacity.

Method used

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  • Vanadium manganese sodium phosphate @ 3D porous graphene composite material, preparation method thereof, and applications of vanadium manganese sodium phosphate @ 3D porous graphene composite material in sodium-ion batteries
  • Vanadium manganese sodium phosphate @ 3D porous graphene composite material, preparation method thereof, and applications of vanadium manganese sodium phosphate @ 3D porous graphene composite material in sodium-ion batteries
  • Vanadium manganese sodium phosphate @ 3D porous graphene composite material, preparation method thereof, and applications of vanadium manganese sodium phosphate @ 3D porous graphene composite material in sodium-ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Firstly, 0.005 mol of vanadyl acetylacetonate, 0.005 mol of manganese acetate tetrahydrate, 0.015 mol of ammonium dihydrogen phosphate, and 0.02 mol of sodium acetate were dissolved in 40 mL of deionized water and stirred thoroughly to obtain a clear solution. Then 0.106 g (8% of the theoretical product mass) of graphene oxide was added to the solution, and after ultrasonic treatment for 30 min, it was stirred at room temperature for 12 h. Then the solution was transferred to a 60mL reactor and reacted at 180°C for 10h. The hydrogel precursor is obtained, and the aerogel is obtained through freeze-drying. The precursor was sintered at 750 °C for 9 h in a tube furnace under an argon atmosphere to obtain a sheet-like structure of sodium vanadium manganese phosphate@3D porous graphene composite.

[0045] See figure 1 . The scanning electron microscope (SEM) image of the prepared sheet-like structure sodium vanadium manganese phosphate@3D porous graphene composite materi...

Embodiment 2

[0048] Firstly, 0.005 mol of vanadyl acetylacetonate, 0.005 mol of manganese acetate tetrahydrate, 0.015 mol of ammonium dihydrogen phosphate, and 0.02 mol of sodium acetate were dissolved in 40 mL of deionized water and stirred thoroughly to obtain a clear solution. Then 0.158 g (12% of the theoretical product mass) of graphene oxide was added to the solution, and after ultrasonic treatment for 30 min, it was stirred at room temperature for 12 h. Then the solution was transferred to a 60mL reactor and reacted at 180°C for 10h. The hydrogel precursor is obtained, and the aerogel is obtained through freeze-drying. The precursor was sintered at 750 °C for 9 h in a tube furnace under an argon atmosphere to obtain a sheet-like structure of sodium vanadium manganese phosphate@3D porous graphene composite.

[0049] The sodium ion battery composite positive electrode material prepared in this example and the sodium sheet were assembled into a button battery. At a rate of 0.5C, the s...

Embodiment 3

[0051] Firstly, 0.005 mol of vanadyl acetylacetonate, 0.005 mol of manganese acetate tetrahydrate, 0.015 mol of ammonium dihydrogen phosphate, and 0.02 mol of sodium acetate were dissolved in 40 mL of deionized water and stirred thoroughly to obtain a clear solution. Then 0.040 g (3% of the theoretical product mass) of graphene oxide was added to the solution, and after ultrasonic treatment for 30 min, it was stirred at room temperature for 12 h. Then the solution was transferred to a 60mL reactor and reacted at 180°C for 10h. The hydrogel precursor is obtained, and the aerogel is obtained through freeze-drying. The precursor was sintered at 750 °C for 9 h in a tube furnace under an argon atmosphere to obtain a sheet-like structure of sodium vanadium manganese phosphate@3D porous graphene composite.

[0052] The sodium ion battery composite cathode material prepared in this example and the sodium sheet were assembled into a button battery at a rate of 0.5C, and after 50 cycle...

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Abstract

The invention discloses a vanadium manganese sodium phosphate @ 3D porous graphene composite material, a preparation method thereof, and applications of the vanadium manganese sodium phosphate @ 3D porous graphene composite material in sodium-ion batteries. The vanadium manganese sodium phosphate @ 3D porous graphene composite material is formed via in-suit growth of flaky vanadium manganese sodium phosphate on a 3D porous graphene skeleton. The preparation method comprises following steps: oxidized graphene is added into an aqueous solution containing a phosphorus source, a sodium source, a manganese source, and a vanadium source; ultrasonic dispersion is adopted, stirring reaction is carried out at room temperature, an obtained product is delivered into a reaction kettle for hydro-thermal reaction so as to obtain a hydrogel precursor; the hydrogel precursor is subjected to freeze drying so as to obtain an aerogel; and the aerogel is subjected to calcining so as to obtain a finished product. The vanadium manganese sodium phosphate @ 3D porous graphene composite material possesses excellent electrochemical performance as a sodium-ion battery cathode material. Operation of the preparation method is simple; cost is low; and commercial application prospect is promising.

Description

technical field [0001] The invention relates to a positive electrode material for a sodium ion battery, in particular to a positive electrode material formed by in-situ compounding of flake-structured sodium vanadium manganese phosphate and 3D porous graphene and a preparation method thereof, and a composite of sodium vanadium manganese phosphate@3D porous graphene The application of the material as a positive electrode material of a sodium ion battery belongs to the field of the sodium ion battery. Background technique [0002] Due to the advantages of high energy density, high stability, and long life, lithium-ion batteries have rapidly occupied the market of portable electronic products (notebook computers, smart mobile equipment, tablet computers, etc.), and continue to penetrate into the field of electric vehicles. However, the reserves of lithium resources in the earth's crust are low and the geographical distribution is uneven, which makes lithium prices continue to r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/505H01M4/38H01M4/583H01M4/62H01M4/36H01M10/054
CPCH01M4/362H01M4/38H01M4/505H01M4/5825H01M4/583H01M4/625H01M10/054Y02E60/10
Inventor 张治安李煌旭陈晓彬尚国志肖志伟赖延清张凯李劼
Owner CENT SOUTH UNIV
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