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Core-shell structured sodium cobalt pyrophosphate/carbon positive electrode composite material, and preparation method and application thereof

A technology of cobalt sodium pyrophosphate and composite materials, which is applied in the direction of structural parts, battery electrodes, electrical components, etc., can solve the problems of difficult material preparation, difficult shape control, low voltage platform, etc., and achieve good repeatability, low cost, good electrical conductivity

Active Publication Date: 2017-09-08
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

[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 it is difficult to prepare materials, have many impurity phases, and difficult to control the shape

Method used

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  • Core-shell structured sodium cobalt pyrophosphate/carbon positive electrode composite material, and preparation method and application thereof
  • Core-shell structured sodium cobalt pyrophosphate/carbon positive electrode composite material, and preparation method and application thereof
  • Core-shell structured sodium cobalt pyrophosphate/carbon positive electrode composite material, and preparation method and application thereof

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Experimental program
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Embodiment 1

[0072] Weigh 0.01mol of cobalt nitrate, 0.01mol of sodium carbonate and 0.02mol of diammonium hydrogen phosphate and dissolve them in 50ml of deionized water, then add 0.3g of dopamine into the above solution, stir to form a uniform solution, and spray dry the aqueous solution. Set the temperature near the nozzle of the spray dryer to 180°C, the outlet temperature to 120°C, the flow rate of the mixed liquid to 400mL / h, and the inlet pressure to 0.6MPa to obtain the precursor. Finally, the above precursor was sintered at 650° C. for 3 h under an argon atmosphere, and the heating rate was 10° C. / min. Finally, the product is washed and dried. Obtain final product (positive electrode composite material); The sample specific surface area that obtains is 196m 2 / g. The SEM picture of the product that makes sees figure 1 ;Depend on figure 1 It is known that concentric spherical Na 2 CoP 2 o 7 / C material with a particle size of 180nm. The TEM images of the prepared samples ( ...

Embodiment 2

[0076] Weigh 0.01mol cobalt chloride, 0.01mol sodium oxalate and 0.02mol diammonium hydrogen phosphate and dissolve them in 15ml deionized water, then add 0.2g pyrrole to the above solution, stir to form a uniform solution, and spray dry the aqueous solution , set the temperature near the nozzle of the spray dryer to 160°C, the outlet temperature to 100°C, the flow rate of the mixed liquid to 400mL / h, and the inlet pressure to 0.5MPa to obtain the precursor. Finally, the above precursor was sintered at 650° C. for 6 h under an argon atmosphere, and the heating rate was 5° C. / min. Finally, the product is washed and dried. Obtain final product (positive electrode composite material); The sample specific surface area that obtains is 256m 2 / g. The sample particle size is 300nm. In the positive electrode composite material prepared in this embodiment, the thickness of the shell layer is about 50 nm.

[0077] The cathode composite material prepared in this embodiment was used a...

Embodiment 3

[0079] Weigh 0.01mol cobalt chloride, 0.02mol sodium acetate and 0.02mol diammonium hydrogen phosphate and dissolve them in 100ml deionized water, then add 0.15g ascorbic acid to the above solution, stir to form a uniform solution, and spray dry the aqueous solution , set the temperature near the nozzle of the spray dryer to 200°C, the outlet temperature to 80°C, the flow rate of the mixed liquid to 500mL / h, and the inlet pressure to 0.2MPa to obtain the precursor. Finally, the above precursor was sintered at 800° C. for 8 h under an argon atmosphere, and the heating rate was 5° C. / min. Finally, the product is washed and dried. Obtain final product (positive electrode composite material); The sample specific surface area that obtains is 135m 2 / g. The sample particle size is 900nm. In the positive electrode composite material prepared in this embodiment, the thickness of the shell layer is about 50 nm.

[0080] The cathode composite material prepared in this embodiment was...

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Abstract

The invention discloses a method for preparing a core-shell positive electrode composite material Na<2>CoP<2>O<7>@C of a sodium ion battery through a spray drying method; a cobalt source, a sodium source and a phosphorus source are dissolved into deionized water based on the stoichiometric ratio separately; then a certain mass of carbon source is added to the solution; after the mixture is stirred uniformly, spray drying is performed by a spray dryer to obtain a precursor; and finally, in protective gas, the precursor is sintered to obtain the carbon / nitrogen doped and carbon-coated composite positive electrode material Na<2>CoP<2>O<7>@C of the sodium ion battery. In addition, the invention also discloses the positive electrode composite material prepared by adopting the preparation method of the sodium ion battery. The preparation method is simple and the condition is mild. The prepared concentric spherical sodium ion battery positive electrode material is uniform in granularity and good in appearance; and when the material is used for the sodium ion battery, high specific capacity, high voltage and high cycling stability are represented.

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] Currently, fossil fuels remain the main source of electricity. However, with the unreasonable mining and utilization of human beings, the shortage of fossil energy is becoming increasingly serious, and the environmental pollution is becoming more and more serious. Therefore, the development and utilization of new clean resources and renewable energy, such as solar energy, wind energy, tidal energy, etc., has become a top priority. But on the other hand, the normal operation of the power grid requires stable and continuous power generation. Solar energy, wind energy, and tidal energy are restricted by factors such as weather, location, and time, which greatly limits their large-scale application and popularization. To solve this problem, large-scale powe...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/366H01M4/5825H01M4/625H01M4/628H01M10/054Y02E60/10
Inventor 张治安尚国志赖延清肖志伟李煌旭陈晓彬张凯李劼
Owner 湖南钠邦新能源有限公司
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