Sodium cobalt pyrophosphate/carbon/graphene positive electrode composite material, preparation and application

A technology of sodium cobalt pyrophosphate and composite materials, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of difficult to control the morphology, difficult material preparation, low specific capacity, etc., and achieve good morphology and repeatability. Good performance and uniform particle size

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

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Problems solved by technology

[0004] Cathode materials are the key to the development of sodium-ion batteries, but there are problems such as low voltage platform, low specific capacity, and poor lifespan. It is particularly critical to develop positive electrode materials with high voltage, high specific capacity and good stability.
Polyanionic Na 2 CoP 2 o 7 It has the advantages of stable three-dimensional structure, excellent cycle life, and high discharge platform, but the material preparation is difficult, there are many impurity phases, poor conductivity and difficult to control the shape

Method used

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  • Sodium cobalt pyrophosphate/carbon/graphene positive electrode composite material, preparation and application
  • Sodium cobalt pyrophosphate/carbon/graphene positive electrode composite material, preparation and application

Examples

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Embodiment 1

[0064] Weigh 0.01mol cobalt nitrate, 0.01mol sodium carbonate and 0.02mol diammonium hydrogen phosphate and dissolve in 50ml deionized water, then add 0.01mol citric acid to the above solution, adjust pH=5 and stir to form a uniform solution, then 0.3 g graphene is dispersed in the above solution, the aqueous solution is heated in an 80° water bath to form a gel, and then transferred to a vacuum oven to be dried to obtain a precursor. Finally, the above-mentioned precursor was ground and sintered at 650°C for 3h under an argon atmosphere, and the heating rate was 10°C / min. Finally, the product is washed and dried. Get the final product (positive electrode composite material);. See the SEM picture of the produced product figure 1 ;by figure 1 It is known that Na with better morphology is finally obtained through sol-gel method + heat treatment 2 CoP 2 O 7 / C / RGO material with a particle size of 180nm.

[0065] The positive electrode composite material prepared in this embodiment...

Embodiment 2

[0068] Weigh 0.01 mol of cobalt chloride, 0.01 mol of sodium oxalate and 0.02 mol of diammonium hydrogen phosphate and dissolve in 15 ml of deionized water, then add 0.025 mol of ascorbic acid to the above solution, adjust pH = 2 and stir to form a uniform solution, then add 0.5 g Graphene is dispersed in the above solution. The aqueous solution is heated in an 80° water bath to form a gel, and then transferred to a vacuum oven to be dried to obtain a precursor. Finally, the above-mentioned precursor was ground and sintered at 700°C for 5h under an argon atmosphere, and the heating rate was 15°C / min. Finally, the product is washed and dried. The final product (positive electrode composite material) is obtained. The particle size of the cathode composite material prepared in this example is 270 nm.

[0069] The positive electrode composite material prepared in this embodiment is used as the working electrode, sodium is the counter electrode, assembled into a button cell, and th...

Embodiment 3

[0071] Weigh 0.01mol of cobalt acetate, 0.02mol of sodium acetate and 0.02mol of ammonium dihydrogen phosphate and dissolve in 100ml of deionized water, then add 0.02mol of polyacrylic acid to the above solution, adjust pH=4 and stir to form a uniform solution, then add 0.5 g graphene is dispersed in the above solution. The aqueous solution is heated in an 80° water bath to form a gel, and then transferred to a vacuum oven to be dried to obtain a precursor. Finally, the above-mentioned precursor was ground and sintered at 800°C for 5h under an argon atmosphere, and the heating rate was 15°C / min. Finally, the product is washed and dried. The final product (positive electrode composite material) is obtained. The particle size of the cathode composite material prepared in this example is 890 nm.

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

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Abstract

The invention discloses a sodium cobalt pyrophosphate/carbon/graphene positive electrode composite material, and a preparation method thereof. The preparation method comprises the following steps: dissolving a cobalt source, a sodium source and a phosphorus source into deionized water separately according to a stoichiometric ratio, adding an acidic metal complexing agent to adjust the pH, stirring uniformly, and adding a certain amount of prepared graphene solution into the solution; mixing uniformly, heating in a water bath pot to form gel, evaporating to dryness under a vacuum drying box to obtain a precursor, grinding the precursor, and sintering under protective gas to obtain a sodium ion battery positive electrode composite material Na2CoP2O7@C which is embellished on graphene. 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 specifically relates to a sodium ion battery cathode composite material and a preparation method thereof. Background technique [0002] At present, fossil fuels are still the main power source. However, with the unreasonable exploitation and utilization of human beings, fossil energy is becoming increasingly tense and environmental pollution is becoming more and more serious. Therefore, the development and utilization of new clean resources and renewable energy sources, such as solar, wind, and tidal energy, has become a top priority. On the other hand, the normal operation of the power grid requires stable and continuous power generation. Solar energy, wind energy, tidal energy, etc. are restricted by factors such as weather, location, and time, which greatly limit its large-scale application and popularization. To solve this problem, large-scale power storage technology has become an import...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/362H01M4/366H01M4/5825H01M4/625H01M10/054Y02E60/10
Inventor 张治安赖延清尚国志陈晓彬肖志伟李煌旭张凯李劼
Owner CENT SOUTH UNIV
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