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Sodium ferrous sulfate/graphene composite positive electrode material for sodium ion battery, and preparation method thereof

A composite cathode material and sodium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as loose binding of active components, poor electrical properties of composite materials, expensive high-voltage-resistant equipment, etc., and achieve improvement ratios Performance, good electrical conductivity, and the effect of improving electrical conductivity

Active Publication Date: 2017-06-13
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Yet the existing method for preparing the composite material of ferrous sodium ferrous sulfate / carbon material needs higher temperature (above 150 ℃), needs expensive high-pressure-resistant equipment, and safety factor is low; Carbon is amorphous carbon, which not only has poor electrical conductivity, but also has poor bonding performance with active components; the electrical properties of composite materials are poor

Method used

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  • Sodium ferrous sulfate/graphene composite positive electrode material for sodium ion battery, and preparation method thereof
  • Sodium ferrous sulfate/graphene composite positive electrode material for sodium ion battery, and preparation method thereof
  • Sodium ferrous sulfate/graphene composite positive electrode material for sodium ion battery, and preparation method thereof

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Embodiment 1

[0071] This embodiment includes the following steps:

[0072] (1) This embodiment is designed to generate 0.03mol of the target product Na 2 Fe 2 (SO 4 ) 3 / Graphene hydrogel nanocomposite material, add 1.34g of graphene oxide into 600mL ultrapure water for ultrasonic dispersion, add 0.06mol of ferrous sulfate into the graphene oxide solution, stir evenly, and supplemented by ultrasonic dispersion for 0.5h to obtain mixture;

[0073] (2) Add 0.033 mol of sodium sulfate to the resulting mixed solution with vigorous stirring. After stirring for 30 minutes, transfer the resulting homogeneous suspension to a hydrothermal reactor, react in a 90°C oven for 24 hours, and cool to room temperature naturally. The product obtained by filtration is quenched in liquid nitrogen and then subjected to vacuum freeze-drying. It is evenly ground and sieved to be Na 2 Fe 2 (SO 4 ) 3 / Precursor of graphene hydrogel;

[0074] (3) The precursor obtained in step (2) is sintered at 250°C for 12 hours under ...

Embodiment 2

[0081] This embodiment includes the following steps:

[0082] (1) This embodiment is designed to generate 0.03mol of the target product Na 2 Fe 2 (SO 4 ) 3 / Graphene hydrogel nanocomposite material, add 1.34g of graphene oxide into 600mL ultrapure water for ultrasonic dispersion, add 0.06mol of ferrous sulfate into the graphene oxide solution, stir evenly, and supplemented by ultrasonic dispersion for 0.5h to obtain mixture;

[0083] (2) Add 0.03 mol of sodium sulfate to the resulting mixed solution with vigorous stirring. After stirring for 30 minutes, transfer the resulting homogeneous suspension to a hydrothermal reactor, react in an oven at 120°C for 24 hours, and cool to room temperature naturally. The product obtained by filtration is quenched in liquid nitrogen and then subjected to vacuum freeze-drying. It is evenly ground and sieved to be Na 2 Fe 2 (SO 4 ) 3 / Precursor of graphene hydrogel;

[0084] (3) The precursor obtained in step (2) is sintered at 250°C for 12 hours un...

Embodiment 3

[0087] This embodiment includes the following steps:

[0088] (1) This embodiment is designed to generate 0.03mol of the target product Na 2 Fe 2 (SO 4 ) 3 / Graphene hydrogel nanocomposite material, add 1.34g of graphene oxide into 600mL ultrapure water for ultrasonic dispersion, add 0.06mol of ferrous sulfate into the graphene oxide solution, stir evenly, and supplemented by ultrasonic dispersion for 0.5h to obtain mixture;

[0089] (2) Add 0.036 mol of sodium sulfate to the resulting mixed solution with vigorous stirring. After stirring for 30 minutes, transfer the resulting homogeneous suspension to a hydrothermal reactor, react in an oven at 120°C for 12 hours, and cool to room temperature naturally. The product obtained by filtration is quenched in liquid nitrogen and then subjected to vacuum freeze-drying. It is evenly ground and sieved to be Na 2 Fe 2 (SO 4 ) 3 / Precursor of graphene hydrogel;

[0090] (3) The precursor obtained in step (2) is sintered at 250°C for 12 hours u...

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Abstract

The present invention discloses a Na2Fe2(SO4)3 / graphene composite positive electrode material for a sodium ion battery. The Na2Fe2(SO4)3 / graphene composite positive electrode material comprises graphene having a three-dimensional structure, wherein Na2Fe2(SO4)3 is compounded on the graphene surface in an in-situ compounding manner. The invention further discloses a preparation method of the composite positive electrode material. The preparation method comprises: dispersing graphene oxide, a sodium source, a sulfur source and a ferrous salt in water to obtain a suspension, carrying out a hydrothermal reaction on the obtained suspension at a temperature of 90-140 DEG C, carrying out solid-liquid separation on the hydrothermal reaction product, carrying out liquid nitrogen quenching, and drying to obtain a precursor; and carrying out calcination treatment on the precursor to obtain the composite positive electrode material. According to the present invention, the active substance and the carbon substrate are tightly bound, the coating is good, and the good physical and chemical properties are provided; the synthesis method is simple, the condition is mild, and the yield is high; the active substance is uniformly dispersed in the prepared composite material; and with the application of the prepared composite material as the sodium ion positive electrode material, the advantages of high specific capacity, high working voltage, good cycle stability and excellent rate performance are provided.

Description

Technical field [0001] The invention belongs to the field of sodium ion batteries, and specifically relates to a composite cathode material for sodium ion batteries and a preparation method thereof. Background technique [0002] Since the 1990s, lithium-ion batteries have made great progress in various fields. They have shown good application prospects in 3C, electric vehicles, large-scale energy storage and other fields. In the 3C field, it is due to their high energy density. There is no substitute for it. However, with the large-scale development of lithium resources, the scarcity and uneven distribution of global metal lithium resources, the raw material costs of lithium-ion batteries are on the rise, making them in the fields of electric vehicles and large-scale energy storage that require a large amount of battery raw materials. Development has been greatly restricted. At the same time, the large-scale energy storage field urgently needs secondary batteries with excellent...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/583H01M4/62H01M4/58H01M10/054
CPCH01M4/362H01M4/525H01M4/58H01M4/583H01M4/625H01M10/054Y02E60/10
Inventor 张治安陈晓彬李军明赖延清李劼
Owner CENT SOUTH UNIV
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