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Vanadium sodium phosphate composite material as well as preparation method and application thereof

A composite material, sodium vanadium phosphate technology, applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems such as the electrochemical sodium storage performance is not given, and achieve good cycle performance, huge application prospects, and simple preparation process.

Inactive Publication Date: 2013-03-27
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Na 3 V 2 (PO 4 ) 3 It was first synthesized by Delmas (Comptes Rendus Hebdomadaires Des Seances Del Academie Des Sciences Serie C, 1978, 287, 169-171), which has a NASICON structure, but has no electrochemical sodium storage performance. It is expected that sodium ions can be quickly deintercalated. It will be a promising cathode material for sodium-ion batteries

Method used

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  • Vanadium sodium phosphate composite material as well as preparation method and application thereof
  • Vanadium sodium phosphate composite material as well as preparation method and application thereof
  • Vanadium sodium phosphate composite material as well as preparation method and application thereof

Examples

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Embodiment 1

[0044] According to Na 3 V 2 (PO 4 ) 3 The ratio of each element in the formula is respectively high-purity V 2 o 3 powder and NaH 2 PO 4 2H 2 O powder was added into a ball milling jar, using ethanol as a medium, and ball milled for 5 hours; after drying and cooling, the Ar / H 2 (H 2 The content is 10%) in the mixed atmosphere, the temperature was raised to 800° C. at a heating rate of 5° C. / min, and the pure sample was obtained after keeping the temperature for 24 hours. figure 1 gives the pure phase Na 3 V 2 (PO 4 ) 3 The XRD diffraction pattern of the space group is

Embodiment 2

[0046] According to Na 3 V 2 (PO 4 ) 3 The ratio of each element in the formula is respectively high-purity V 2 o 3 powder and NaH 2 PO 4 2H 2 O powder was put into a ball mill jar, and a certain amount of sucrose was added, and ball milled for 5 hours with ethanol as the medium; after drying and cooling, the temperature was raised to 900°C in an Ar atmosphere at a rate of 5°C / min, and kept for 48 hours to obtain pure Sample. figure 2 gives the carbon-coated Na 3 V 2 (PO 4 ) 3 of the Raman spectrum. Raman spectroscopy showed that carbon was indeed present in the composite.

Embodiment 3

[0048] According to Na 3 V 2 (PO 4 ) 3 The ratio of each element in the formula is respectively high-purity V 2 o 3 powder and NaH 2 PO 4 2H 2 Add the O powder into a ball mill tank, and use ethanol as the medium, and ball mill for 5 hours; after drying and cooling, raise the temperature to 800°C at a rate of 5°C / min in an Ar atmosphere, and keep it for 12 hours to obtain a pure phase of Na 3 V 2 (PO 4 ) 3 .

[0049] According to Na 3 V 2 (PO 4 ) 3 , acetylene black, and PVDF each accounted for 80%, 10%, and 10% were prepared into electrodes as an electrode of the half-cell, and the counter electrode was made of metal sodium, and 1mol / L of NaPF6 / ethylene carbonate (EC)-carbonic acid Diethyl ester (DEC) (the volume ratio of EC and DEC is 1:1) was used as the electrolyte, and the batteries were assembled in a glove box, and the cyclic voltammetry tests were performed on the batteries. The voltage range is 2.6-4V, the scan rate is 50uV / s, the test results are show...

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Abstract

The invention relates to a vanadium sodium phosphate composite material as well as a preparation method and an application thereof. The general formula of the composite material provided by the invention is C1-xNx-LaNabMcVd(PO4)3, wherein C1-xNx is carbon or carbon doped with nitrogen, L is one or two selected from Li and K; M is one or more than one selected from Mg, B, Al, Ca, Ti, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ce, Y, Zr, Nb, Mo, Sn, La, Ta and W; and x, a, b, c and d are mol percents, wherein x is more than or equal to 0 and less than 1, a is more than or equal to 0 and less than 2, b is more than 1 and less than or equal to 3, c is more than or equal to 0 and less than or equal to 1, and d is more than or equal to 1 and less than or equal to 2. The invention also provides a preparation method and an application of the composite material. The vanadium sodium phosphate composite material can be taken as cathode or anode material of a secondary sodium-ion battery, especially vanadium sodium phosphate composite material coated with carbon and nitrogen has higher coulombic efficiency and ion and electron conductivity and better cycling performance, is high in safety, low in price, simple in process and wide in application range and can be applied to energy storage equipment, a backup power supply, a spare power supply and the like.

Description

technical field [0001] The invention belongs to the technical field of batteries, in particular to sodium vanadium phosphate-based rechargeable sodium-ion batteries. Background technique [0002] Since its commercialization in 1990, lithium-ion batteries have been widely used in portable electronic devices such as cameras, notebook computers, and mobile phones due to their high energy density, light weight, and small size. With the widespread use of lithium-ion batteries in electric vehicles, the demand for lithium will increase greatly, but lithium reserves are limited. [0003] Sodium is abundant on the earth, accounting for about 2.74%. It is the sixth largest element and can be easily obtained from seawater. J.-M.Tarascon et al studied Na 1.5 VOPO 4 f 0.5 As the electrochemical properties of the sodium ion battery, there are two platforms at 4.1V and 3.6V, and charge and discharge can be performed (Solid State Sciences, 2006, 8, 1215-1221). Shinichi Komaba et al. st...

Claims

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Application Information

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IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 胡勇胜简泽浪李泓陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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