Composite cathode material of sodium-ion battery and preparation method of composite cathode material

A composite cathode material, sodium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of low electronic conductivity and ionic conductivity, affect structural stability and cycle performance, and it is difficult to obtain electrochemical performance. and other problems, to achieve the effect of improving ionic conductivity, good structural stability and high ionic conductivity

Active Publication Date: 2016-10-26
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite the above advantages, its low electronic and ionic conductivity makes it difficult to obtain Na with good electrochemical performance. 2 PPML 4 F cathode material
[0004] At present, the methods of carbon coating and bulk doping are commonly used to increase the Na 2 PPML 4 The electronic conductivity of F was improved by refining the particles, but the modification effect was still limited. Na 2 PPML 4 The electrochemical performance of F needs to be further improved
In addition, similar to other Mn-based materials, Na 2 PPML 4 F has the Jahn-Teller effect of Mn and the dissolution of Mn during the charge and discharge process, which affects its structural stability and cycle performance. 2 PPML 4 Jahn-Teller Effect of F and Report of Mn Dissolution Method

Method used

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  • Composite cathode material of sodium-ion battery and preparation method of composite cathode material
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  • Composite cathode material of sodium-ion battery and preparation method of composite cathode material

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preparation example Construction

[0049] In order to obtain the above-mentioned positive electrode material, the present invention also provides a preparation method of a composite positive electrode material for a sodium ion battery, comprising:

[0050]Molar ratio Na:Mn:P:F:spinning aid=2:1:1:1:(10 -5 ~10 -1 ) Sodium source compound, manganese source compound, phosphorus source compound, fluorine source compound and spinning aid are added to the solvent and mixed to obtain electrospinning solution A; in molar ratio Na:V:P:F:spinning aid= 3:2:2:3:(10 -5 ~10 -1 ) Add sodium source compound, vanadium source compound, phosphorus source compound, fluorine source compound and spinning aid to the solvent and mix to obtain electrospinning solution B; take electrospinning solution A as the inner axis, and use electrospinning solution A B is coaxial electrospinning on the outer axis to obtain a coaxial nanofiber precursor; the coaxial nanofiber precursor is heat-treated in an inert atmosphere, and the composite pos...

Embodiment 1

[0061] a. Prepare 0.97mol / L Na 2 PPML 4 F spinning solution 20mL: NaH 2 PO 4 , NaF, Mn(CH 3 COO) 2 4H 2 O according to the stoichiometric ratio, using dimethylformamide as a solvent, stirring at a temperature of 30°C until completely dissolved, adding 1.5g of polyvinylpyrrolidone with an average molecular weight of 1,300,000, and continuing to stir until a uniform spinning solution is formed;

[0062] b. Prepare 0.5mol / L Na 3 V 2 (PO 4 ) 2 f 3 Spinning solution 20mL: NaF, NH 4 VO 3 , NH 4 h 2 PO 4 Dosing according to the stoichiometric ratio, using dimethylformamide as a solvent, stirring at 30°C until completely dissolved, adding 1.5 g of polyvinylpyrrolidone with an average molecular weight of 1,300,000, and continuing to stir until a uniform spinning solution is formed.

[0063] c. Na 2 PPML 4 F spinning solution and Na 3 V 2 (PO 4 ) 2 f 3 The spinning solution was pumped into 5mL syringe pumps respectively, a coaxial spinning needle was installed, the...

Embodiment 2

[0066] a. Prepare 0.97mol / L Na 2 PPML 4 F spinning solution 20mL: NaH 2 PO 4 , NaF, Mn(CH 3 COO) 2 4H 2 O according to the stoichiometric ratio, using dimethylformamide as a solvent, stirring at a temperature of 30°C until completely dissolved, adding 1.5g of polyvinylpyrrolidone with an average molecular weight of 1,300,000, and continuing to stir until a uniform spinning solution is formed;

[0067] b. Prepare 0.5mol / L Na 3 V 2 (PO 4 ) 2 f 3 Spinning solution 20mL: NaF, NH 4 VO 3 , NH 4 h 2 PO 4 Dosing according to the stoichiometric ratio, using dimethylformamide as a solvent, stirring at 30°C until completely dissolved, adding 1.5 g of polyvinylpyrrolidone with an average molecular weight of 1,300,000, and continuing to stir until a uniform spinning solution is formed.

[0068] c. Na 2 PPML 4 F spinning solution and Na 3 V 2 (PO 4 ) 2 f 3 The spinning solution was extracted into 5mL syringes respectively, and a coaxial spinning needle was installed. T...

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Abstract

The invention discloses a composite cathode material of a sodium-ion battery. The composite cathode material is characterized by comprising a core part and a sheath coating the surface of the core part. The core part is made from a compound shown in the formula (i), that is Na2MnPO4F (i), and doped with amorphous carbon. The sheath is made from a compound shown in the formula (ii), that is Na3V2(PO4)2F3 (ii) and doped with amorphous carbon. The weight ratio of the compound shown in the formula (i) to the compound shown in the formula (ii) to amorphous carbon is (10-95):(3-90):(0.1-20). The provided composite cathode material of a sodium-ion battery is good in structural stability and cycling performance.

Description

technical field [0001] The invention relates to the field of secondary battery electrode materials, in particular to a composite positive electrode material for a sodium ion battery and a preparation method thereof. Background technique [0002] With the increase in the development and utilization of new energy sources (solar energy, wind energy, etc.) and the expansion of grid energy storage, the demand for lithium-ion batteries for energy storage devices is also increasing year by year. It is foreseeable that lithium reserves cannot meet the needs of large-scale energy storage in the future, and sodium, which has similar properties to lithium and has a more price advantage, has thus entered people's attention. The standard electrode potential of sodium is only 0.3V higher than that of lithium (E 0 Na / Na+ =-2.71V, E 0 Li / Li+ =-3.04V vs. S.H.E.), sodium ion Li-ion The radius is larger. Although the migration rate of sodium ions is slower than that of lithium ions, co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/136H01M4/1397H01M10/054
CPCH01M4/136H01M4/1397H01M4/366H01M4/5825H01M10/054Y02E60/10
Inventor 伍凌石少楠钟胜奎张晓萍刘洁群李云祥向盼施妍伶
Owner SUZHOU UNIV
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