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A kind of sodium ferrous sulfate/graphene composite cathode material for sodium ion battery and preparation method thereof

A composite cathode material, graphene composite technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor bonding performance of active components, poor electrical performance of composite materials, expensive high-voltage equipment, etc., to improve the rate Good performance, good electrical conductivity, the effect of improving electrical conductivity

Active Publication Date: 2019-04-09
湖南钠邦新能源有限公司
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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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  • A kind of sodium ferrous sulfate/graphene composite cathode material for sodium ion battery and preparation method thereof
  • A kind of sodium ferrous sulfate/graphene composite cathode material for sodium ion battery and preparation method thereof
  • A kind of sodium ferrous sulfate/graphene composite cathode material for sodium ion battery and preparation method thereof

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Embodiment 1

[0071] This embodiment includes the following steps:

[0072] (1) The design of this embodiment generates 0.03mol target product Na 2 Fe 2 (SO 4 ) 3 / graphene hydrogel nanocomposite material, 1.34g graphene oxide is added into 600mL ultrapure water for ultrasonic dispersion, 0.06mol ferrous sulfate is added to the graphene oxide solution, stirred evenly, supplemented by ultrasonic dispersion for 0.5h at the same time, obtained mixture;

[0073] (2) Add 0.033 mol of sodium sulfate to the obtained mixed solution, supplemented by vigorous stirring, and after stirring for 30 minutes, transfer the obtained homogeneous suspension to a hydrothermal reaction kettle, react in an oven at 90°C for 24 hours, and cool naturally to room temperature. The product obtained by filtration is quenched in liquid nitrogen and then vacuum freeze-dried, ground and sieved evenly to obtain Na 2 Fe 2 (SO 4 ) 3 / Precursors of graphene hydrogels;

[0074] (3) The precursor obtained in step (2) w...

Embodiment 2

[0081] This embodiment includes the following steps:

[0082] (1) The design of this embodiment generates 0.03mol target product Na 2 Fe 2 (SO 4 ) 3 / graphene hydrogel nanocomposite material, 1.34g graphene oxide is added into 600mL ultrapure water for ultrasonic dispersion, 0.06mol ferrous sulfate is added to the graphene oxide solution, stirred evenly, supplemented by ultrasonic dispersion for 0.5h at the same time, obtained mixture;

[0083] (2) Add 0.03 mol of sodium sulfate to the obtained mixed solution, supplemented by vigorous stirring, and after stirring for 30 minutes, transfer the obtained homogeneous suspension to a hydrothermal reaction kettle, react in an oven at 120°C for 24 hours, and cool naturally to room temperature. The product obtained by filtration is quenched in liquid nitrogen and then vacuum freeze-dried, ground and sieved evenly to obtain Na 2 Fe 2 (SO 4 ) 3 / Precursors of graphene hydrogels;

[0084] (3) The precursor obtained in step (2) w...

Embodiment 3

[0087] This embodiment includes the following steps:

[0088] (1) The design of this embodiment generates 0.03mol target product Na 2 Fe 2 (SO 4 ) 3 / graphene hydrogel nanocomposite material, 1.34g graphene oxide is added into 600mL ultrapure water for ultrasonic dispersion, 0.06mol ferrous sulfate is added to the graphene oxide solution, stirred evenly, supplemented by ultrasonic dispersion for 0.5h at the same time, obtained mixture;

[0089] (2) Add 0.036 mol of sodium sulfate to the obtained mixed solution, supplemented by vigorous stirring, and after stirring for 30 minutes, transfer the obtained homogeneous suspension to a hydrothermal reaction kettle, react in an oven at 120°C for 12 hours, and cool naturally to room temperature. The product obtained by filtration is quenched in liquid nitrogen and then vacuum freeze-dried, ground and sieved evenly to obtain Na 2 Fe 2 (SO 4 ) 3 / Precursors of graphene hydrogels;

[0090] (3) The precursor obtained in step (2) ...

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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 in particular relates to a composite positive electrode 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, and have shown good application prospects in 3C, electric vehicles, large-scale energy storage and other fields. There is no substitute for it. However, with the massive development of lithium resources, the scarcity and uneven distribution of lithium metal resources in the world, the cost of raw materials for lithium-ion batteries is on the rise, making them widely used in fields such as electric vehicles and large-scale energy storage that require a large amount of battery raw materials. Development has been severely restricted. At the same time, the field of large-scale energy storage urgently needs secondary batteries with excellent performance and lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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 湖南钠邦新能源有限公司