Composite electrode material of sodium cobalt pyrophosphate/carbon, preparation and application of composite electrode material

A composite cathode material, sodium cobalt pyrophosphate technology, applied in battery electrodes, electrical components, electrochemical generators and other directions, can solve the problems of difficult to control morphology, poor conductivity, difficult preparation, etc., to improve poor conductivity and less impurities , the effect of uniform particle dispersion

Inactive Publication Date: 2017-08-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the material is difficult to prepare, has many impurity phases, poor conductivity and difficult to control the shape.

Method used

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  • Composite electrode material of sodium cobalt pyrophosphate/carbon, preparation and application of composite electrode material
  • Composite electrode material of sodium cobalt pyrophosphate/carbon, preparation and application of composite electrode material
  • Composite electrode material of sodium cobalt pyrophosphate/carbon, preparation and application of composite electrode material

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Experimental program
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Effect test

Embodiment 1

[0071] Weigh 0.011mol of cobalt nitrate, 0.009mol of sodium carbonate and 0.02mol of diammonium hydrogen phosphate and dissolve them in 10ml of deionized water, then add 0.011mol of citric acid to the above solution, stir to form a uniform solution, and bring the aqueous solution to 80° Heat in a water bath to form a gel, and then transfer to a vacuum oven to dry to obtain a precursor. Finally, the above precursors were ground and sintered at 650°C for 3 hours under an argon atmosphere, with a heating rate of 10°C / min. Finally, the product is washed and dried. Get the final product (positive electrode composite material) Na 1.8 co 1.1 P 2 o 7 / C. The crystal form of the material is shown in figure 1 As shown, the XRD pattern is as figure 2 shown.

[0072] The positive electrode composite material prepared in this embodiment is used as the working electrode, and the sodium is used as the counter electrode, which is assembled into a button battery, and the cycle perform...

Embodiment 2

[0074] Weigh 0.012mol of cobalt chloride, 0.008mol of sodium oxalate and 0.02mol of diammonium hydrogen phosphate and dissolve them in 15ml of deionized water, then add 0.022mol of ascorbic acid into the above solution, and stir to form a uniform solution. The aqueous solution is heated in an 80 ° water bath to form a gel, and then transferred to a vacuum oven to dry to obtain a precursor. Finally, the above precursor was ground and sintered at 700°C for 5 hours under an argon atmosphere with a heating rate of 15°C / min. Finally, the product is washed and dried. Get the final product (positive electrode composite material) Na 1.6 co 1.2 P 2 o 7 / C.

[0075] The positive electrode composite material prepared in this embodiment is used as the working electrode, and the sodium is used as the counter electrode, which is assembled into a button battery, and the cycle performance is tested at a rate of 2.5C. At 2.5C rate, the specific capacity reaches 38mAh / g, and the voltage p...

Embodiment 3

[0077] Weigh 0.0125 mol of cobalt acetate, 0.015 mol of sodium acetate and 0.02 mol of diammonium hydrogen phosphate and dissolve them in 100 ml of deionized water, then add 0.01 mol of citric acid to the above solution, and stir to form a uniform solution. The aqueous solution was heated in an 80 ° water bath to form a gel, and then transferred to a vacuum oven to dry to obtain a precursor. Finally, the above precursors were ground and sintered at 750°C for 5 hours under an argon atmosphere with a heating rate of 15°C / min. Finally, the product is washed and dried. Get the final product (positive electrode composite material) Na 1.5 co 1.25 P 2 o 7 / C.

[0078]The positive electrode composite material prepared in this embodiment is used as the working electrode, and the sodium is used as the counter electrode, which is assembled into a button cell, and the electrochemical performance is tested at a rate of 2.5C. At a current density of 2.5C, the specific capacity reaches...

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Abstract

The invention discloses a composite electrode material of sodium cobalt pyrophosphate / carbon. The chemical general formula of the sodium cobalt pyrophosphate / carbon is Na2-2xCo1+xP2O7, wherein x is greater than 0 and less than or equal to 0.25. The invention further discloses a preparation method of the composite electrode material. The preparation method comprises the following steps: dissolving a cobalt source, a sodium source and a phosphorus source into water according to the ratio of the elements in the chemical general formula to obtain mixed liquid, adding a complexing agent into the mixed liquid, stirring and heating to obtain gel, and drying the gel to obtain a precursor; calcining the precursor to obtain the composite positive electrode material. In addition, the invention further provides application of the composite positive electrode material serving as a sodium ion battery positive electrode material. The preparation method provided by the invention is simple and mild in condition. The prepared sodium ion battery positive electrode material has uniform granularity and good appearance, and has high specific capacity and high voltage and shows excellent circulating stability when being applied to a sodium ion battery.

Description

technical field [0001] The invention belongs to the field of sodium ion batteries, and in particular relates to a sodium ion battery cathode composite material and a preparation method thereof. Background technique [0002] With global climate change and the rapid reduction of fossil fuels that can be effectively used, energy storage and conversion has become one of the important issues restricting the sustainable development of the world economy. Therefore, it is imminent to develop efficient, clean and sustainable energy storage and conversion technologies. Among various energy storage technologies, electrochemical energy storage technology is an important branch. The carrier of electrochemical energy storage is a battery. In the existing energy storage battery system, lithium-ion batteries have been used more and more in human daily life since the 1990s due to their advantages such as high voltage, high specific energy, and long cycle life. More and more widely used, it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/054
CPCH01M4/366H01M4/5825H01M4/583H01M4/625H01M10/054Y02E60/10
Inventor 张治安赖延清尚国志李煌旭陈晓彬肖志伟张凯李劼
Owner CENT SOUTH UNIV
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