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Cathode material for sodium-ion battery, preparation method of cathode material and sodium-ion battery

A sodium-ion battery and positive electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of limiting the production of graphene and sodium-ion battery materials, unfavorable mass production, etc., to improve electrochemical performance and realize freedom The effect of transforming and improving conductivity

Active Publication Date: 2016-10-12
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the commonly used graphene preparation methods include the Hummers method of top-down stripping, the chemical vapor deposition method of cracking and depositing a carbon-containing gas source on the growth substrate at high temperature, and the transition metal (such as Fe) under high temperature conditions (1000 ° C). Above) catalytic method etc., and these methods are all unfavorable for large-scale production, have limited graphene and sodium-ion battery material composite in the industrial production

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  • Cathode material for sodium-ion battery, preparation method of cathode material and sodium-ion battery
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  • Cathode material for sodium-ion battery, preparation method of cathode material and sodium-ion battery

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[0038] The invention provides a method for preparing a positive electrode material for a sodium ion battery, comprising the following steps:

[0039] A) mixing and ball milling the sodium source compound, the vanadium source compound and the phosphorus source compound with a solvent to obtain a mixed solution;

[0040] B) drying the mixed solution to obtain a precursor;

[0041] C) pre-calcining the precursor under an inert atmosphere to obtain calcined powder;

[0042] D) mixing the calcined powder with the second carbon source compound, and sintering in an inert atmosphere to obtain a positive electrode material for a sodium ion battery.

[0043] In the invention, the sodium source compound, the vanadium source compound and the phosphorus source compound are mixed and ball-milled with a solvent to obtain a mixed solution.

[0044] Specifically, in the present invention, after mixing the sodium source compound, the vanadium source compound and the phosphorus source compound...

Embodiment 1

[0067] Mix 0.09mol sodium acetate, 0.09mol ammonium dihydrogen phosphate, and 0.06mol ammonium metavanadate, add 15wt% citric acid, put in a ball mill jar and add acetone ball mill for 12 hours to make it evenly mixed, and put the evenly mixed solution into Dry in an oven at 80°C to obtain a precursor; place the precursor in an argon-hydrogen atmosphere for pre-sintering, the pre-sintering temperature is 400°C, and the pre-sintering time is 6 hours to obtain a calcined powder; take 1g of the calcined powder and 15wt% The polyvinyl alcohol is mixed and ground evenly, placed in an argon-hydrogen atmosphere for the second step of sintering, the sintering temperature is 750°C, and the sintering time is 12 hours to obtain the finished powder.

[0068] The resulting product was tested by XRD as a pure phase of Na 3 V 2 (PO 4 ) 3 , no characteristic peaks of graphene were detected, see figure 1 (a) in which, figure 1 For the Na synthesized in Example 1 3 V 2 (PO 4 ) 3 (a), t...

Embodiment 2

[0077] Mix 0.09mol sodium acetate, 0.09mol ammonium dihydrogen phosphate, and 0.06mol ammonium metavanadate, add 15wt% polyvinyl alcohol, add acetone ball mill to the ball mill tank for 12 hours to make it evenly mixed, and put the evenly mixed solution into Dry in an oven at 80°C to obtain a precursor; place the precursor in an argon-hydrogen atmosphere for pre-sintering, the pre-sintering temperature is 400°C, and the pre-sintering time is 6 hours to obtain a calcined powder; take 1g of the calcined powder and 15wt% The polyvinyl alcohol is mixed and ground evenly, placed in an argon-hydrogen atmosphere for the second step of sintering, the sintering temperature is 750°C, and the sintering time is 12 hours to obtain the finished powder.

[0078] The resulting product was tested by XRD as a pure phase of Na 3 V 2 (PO 4 ) 3 , the characteristic peaks of graphene were not detected see figure 1 (b) in figure 1 For the Na synthesized in Example 1 3 V 2 (PO 4 ) 3 (a), the...

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Abstract

The invention provides a cathode material for a sodium-ion battery, a preparation method of the cathode material for the sodium-ion battery and the sodium-ion battery. The method that a metal oxide catalyzes carbon sources to grow graphene in situ provided by the invention realizes the free conversions of the carbon sources, thereby being beneficial to industrial mass production. Furthermore, a certain amount of organic carbon sources are added in the synthesis process of Na3V2 (PO4)3(Sodium Vanadium Phosphate), and catalyzed to generate graphene under the effect of metal oxide, namely vanadium oxide at low temperature, and the graphene is uniformly coated on the surfaces of vanadium phosphate sodium particles to form a uniform carbon network layer, so that the conductivities of the material ions and electrons are enhanced to improve electrochemical performance of the material.

Description

technical field [0001] The invention belongs to the technical field of sodium ion batteries, and in particular relates to a sodium ion battery cathode material, a preparation method thereof and a sodium ion battery. Background technique [0002] In recent years, the rapid development of lithium-ion batteries has led to a rapid increase in the demand for lithium, accompanied by an increase in the price of lithium, while sodium and lithium are in the same main group and have similar physical and chemical properties. In addition, sodium is widely distributed In the earth's crust and seawater, therefore, the development of Na-ion batteries has also attracted the attention of many researchers. [0003] In the research, it was found that many electrode materials for sodium-ion batteries have been developed from lithium-ion battery electrode materials, such as: Na x MO 2 , NaFePO 4 , Na 3 V 2 (PO 4 ) 3 , hard carbon, etc., among them, sodium vanadium phosphate Na 3 V 2 (PO...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/136H01M4/1397H01M10/054
CPCH01M4/136H01M4/1397H01M4/362H01M4/5825H01M4/625H01M10/054Y02E60/10
Inventor 陈春华胡乔廖家英
Owner UNIV OF SCI & TECH OF CHINA
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