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Sodium-ion battery positive electrode material, preparation method thereof and sodium-ion battery

A technology of sodium ion battery and positive electrode material, applied in battery electrodes, electrolyte battery manufacturing, secondary battery and other directions, can solve the problem of FeHCF crystal defects and other problems, and achieve the effect of excellent electrochemical performance, low cost and good cycle performance

Active Publication Date: 2020-08-18
浙江钠创新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved in the present invention is to provide a kind of positive electrode material of sodium ion battery and its preparation method and sodium ion battery in order to overcome the defects of FeHCF crystal defects in the prior art

Method used

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  • Sodium-ion battery positive electrode material, preparation method thereof and sodium-ion battery
  • Sodium-ion battery positive electrode material, preparation method thereof and sodium-ion battery
  • Sodium-ion battery positive electrode material, preparation method thereof and sodium-ion battery

Examples

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Effect test

Embodiment 1

[0061] Preparation of FeHCF

[0062] The present embodiment relates to a kind of Prussian blue material, the preparation method of FeHCF, comprises the following steps:

[0063] (1) Dissolve 0.2g of sodium ferrocyanide, 1g of citric acid and 1g of sodium citrate in a mixed solution of 40ml of water and 10ml of ethanol, stir evenly, then transfer to a 100ml polytetrafluoroethylene reactor, and seal the reactor Put it in a metal shell, and then place it in a blast drying oven at 120 degrees to react for 12 hours.

[0064] (2) The reactor is cooled down, the product is centrifuged, and vacuum-dried at 120 degrees for 12 hours to obtain the Prussian blue-type sodium-ion battery cathode material FeHCF (Na 1.95 Fe[Fe(CN) 6 ] 0.995 ·□ 0.005 ), D50 is 6.98 microns.

Embodiment 2

[0066] Preparation of FeHCF

[0067] The present embodiment relates to a kind of Prussian blue material, the preparation method of FeHCF, comprises the following steps:

[0068] (1) 1g of sodium ferrocyanide, 10g of citric acid and 10g of sodium citrate are dissolved in a mixed solution of 40ml of water and 10ml of ethanol, stirred evenly, then transferred to a 100ml polytetrafluoroethylene reactor, and the reactor is sealed in Put it in a metal shell, and then place it in a blast drying oven at 80 degrees to react for 16 hours.

[0069] (2) The reactor is cooled down, the product is centrifuged, and vacuum-dried at 120 degrees for 12 hours to obtain the Prussian blue-type sodium-ion battery cathode material FeHCF (Na 1.84 Fe[Fe(CN) 6 ] 0.981 ·□ 0.019 ), D50 is 7.86 microns.

Embodiment 3

[0071] Preparation of FeHCF

[0072] The present embodiment relates to a kind of Prussian blue material, the preparation method of FeHCF, comprises the following steps:

[0073] (1) Dissolve 2g of sodium ferrocyanide, 20g of citric acid and 20g of sodium citrate in a mixed solution of 40ml of water and 10ml of ethanol, stir evenly, then transfer to a 100ml polytetrafluoroethylene reactor, and seal the reactor in In a metal shell, it was then placed in a blast drying oven at 160°C for 8 hours of reaction.

[0074] (2) The reactor is cooled down, the product is centrifuged, and vacuum-dried at 120 degrees for 12 hours to obtain the Prussian blue-type sodium-ion battery cathode material FeHCF (Na 1.86 Fe[Fe(CN) 6 ] 0.990 ·□ 0.010 ), D50 is 8.28 microns.

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Abstract

The invention discloses a sodium ion battery positive electrode material, a preparation method thereof and a sodium ion battery; the preparation method comprises the following steps: step 1, uniformlymixing reactants comprising sodium ferrocyanide, organic weak acid and a complexing agent to obtain a solution A; and 2, subjecting the solution A to heat preservation for 8-16 h at the temperature of 80-160 DEG C, cooling, washing a product, and drying. Under the condition that the prepared sodium-ion battery positive electrode material is not coated with any conductive material, the first discharge capacity of the prepared battery is 117.8 mAg <-1 > under the current density of 1A g <-1 >, the capacity retention rate of the prepared battery reaches up to 88.9% after 200 times of charge-discharge cycles, and the electrochemical performance of the prepared battery is very excellent.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a positive electrode material for a sodium ion battery, a preparation method thereof, and a sodium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of long cycle life, high energy density, no memory effect, fast charging and discharging, and environmental friendliness, and have been widely used in production and life. However, limited lithium resources and increasing lithium prices will also become important factors limiting the further development of lithium-ion batteries. Metal sodium and lithium are the same main group element, Na / Na + Electricity to standard electrode potential -2.71V, and Li / Li + The standard potential is close to -3.04V. During the charging and discharging process, sodium ions, like lithium ions, are intercalated and extracted between the positive and negative electrodes of the battery to form a sodium-ion battery. C...

Claims

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Application Information

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IPC IPC(8): C01C3/12H01M4/58H01M10/054H01M10/058
CPCC01C3/12H01M4/58H01M10/058H01M10/054C01P2004/03C01P2002/72C01P2006/40Y02E60/10Y02P70/50
Inventor 马紫峰冯凡陈苏莉车海英廖建平马思堃
Owner 浙江钠创新能源有限公司
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