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Metal-doped Na3V2(PO4)3 composite electrode material and preparation method and application thereof

A composite electrode and sodium vanadium phosphate technology, which is applied in nanotechnology for materials and surface science, battery electrodes, circuits, etc., can solve problems such as unsatisfactory rate performance, difficulty in reaching theoretical specific capacity, and adverse effects

Inactive Publication Date: 2018-01-19
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Na 3 V 2 (PO 4 ) 3 The electronic conductivity is poor, it is difficult to reach its theoretical specific capacity during charge and discharge, and the rate performance is not ideal
This strongly affects the Na 3 V 2 (PO 4 ) 3 Energy density of electrode materials, which in turn adversely affects their use in large-scale energy storage applications

Method used

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  • Metal-doped Na3V2(PO4)3 composite electrode material and preparation method and application thereof
  • Metal-doped Na3V2(PO4)3 composite electrode material and preparation method and application thereof
  • Metal-doped Na3V2(PO4)3 composite electrode material and preparation method and application thereof

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Embodiment 1

[0071] The preparation method of a kind of metal-doped sodium vanadium phosphate composite electrode material that this embodiment relates to, described preparation method is as follows:

[0072] (1) Selection of raw materials: the sodium source selected in this embodiment is Na 2 CO 3 , the vanadium source is V 2 o 5 , the M source is Ca(NO 3 ) 2 , the phosphorus source is NH 4 h 2 PO 4 , the carbon source is polyethylene glycol-400 (PEG-400) and the organic reducing agent is ascorbic acid.

[0073] (2) The amount of raw material: the Na 2 CO 3 mass m 1 is 0.636g, the V 2 o 5 mass m 2 is 0.709g, the Ca(NO 3 ) 2 mass m 3 0.033g, the NH 4 h 2 PO 4 mass m 4 1.380g, the polyethylene glycol-400 (PEG-400) volume V 0 6ml, the mass of ascorbic acid m 5 is 1.057g and the deionized water volume V is 70ml.

[0074] (3) Preparation of mixed solution: under continuous stirring condition, at first, the Na 2 CO 3 , the V 2 o 5 , the Ca(NO 3 ) 2 and the NH 4 h ...

Embodiment 2

[0086] The preparation method of a kind of sodium vanadium phosphate composite electrode material involved in this embodiment is basically the same as the preparation method of embodiment 1, only difference is:

[0087] The M source is Mg(NO 3 ) 2 , mass m 3 It is 0.018g.

[0088] The V 2 o 5 mass m 2 It is 0.717g.

[0089] The metal-doped sodium vanadium phosphate composite electrode material obtained by the preparation method of the above-mentioned metal-doped sodium vanadium phosphate composite electrode material is Na 3 V 1.97 Mg 0.03 (PO 4 ) 3 / C(x=0.03) composite electrode material.

[0090] With 70wt%Na 3 V 1.97 Mg 0.03 (PO 4 ) 3 / C electrode material, 15wt% acetylene black, 15wt% PVDF, made into slurry, evenly coated on aluminum foil, after vacuum drying, punched into a circular electrode pole piece, with metal sodium as the counter electrode, 1mol / LNaClO 4 / DMC+EC (volume ratio 1:1)+5% FEC is the electrolyte, Whatman DF / D is the separator, and assembl...

Embodiment 3

[0092] The preparation method of a kind of sodium vanadium phosphate composite electrode material involved in this embodiment is basically the same as the preparation method of embodiment 1, only difference is:

[0093] The M source is Ni(NO 3 ) 2 , mass m 3 It is 0.116g.

[0094] The V 2 o 5 mass m 2 It is 0.691g.

[0095] The metal-doped sodium vanadium phosphate composite electrode material obtained by the preparation method of the above-mentioned metal-doped sodium vanadium phosphate composite electrode material is Na 3 V 1.9 Ni 0.1 (PO 4 ) 3 / C(x=0.1) Composite electrode material.

[0096] With 70wt%Na 3 V 1.9 Ni 0.1 (PO 4 ) 3 / C electrode material, 15wt% acetylene black, 15wt% PVDF, made into slurry, evenly coated on aluminum foil, after vacuum drying, punched into a circular electrode pole piece, with metal sodium as the counter electrode, 1mol / LNaClO 4 / DMC+EC (volume ratio 1:1)+5% FEC is the electrolyte, Whatman DF / D is the separator, and assembled in...

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Abstract

The invention relates to a metal-doped Na3V2(PO4)3 composite electrode material and a preparation method and application thereof. The metal-doped Na3V2(PO4)3 composite electrode material is a Na3V<2-x>M<x>(PO4)3 / C composite electrode material in a micro-nano composite particle shape. According to the preparation method, an organic matter carbon source is added and can be coated on a surface of Na3V<2-x>M<x>(PO4)3 / C precursor particle in an in-situ way during the hydrothermal process, can be used for preventing the Na3V<2-x>M<x>(PO4)3 / C precursor particle from being grown and agglomerated and also can be decomposed to amorphous carbon during the thermal treatment process, the formation core is Na3V<2-x>M<x>(PO4)3 / C particle, and a shell is a core-shell structure of the amorphous carbon. Themetal-doped Na3V2(PO4)3 composite electrode material has the advantages of favorable conductivity, excellent cycle stability, rate performance and the like. The metal-doped Na3V2(PO4)3 composite electrode material belongs to the field of an electrode material.

Description

technical field [0001] The invention belongs to the field of electrode materials, in particular to a metal-doped sodium vanadium phosphate composite electrode material and its preparation method and application Background technique [0002] Sodium-ion batteries have the advantages of abundant sodium resources, low price and wide distribution. The development and application of sodium-ion batteries can alleviate the serious shortage of lithium resources to a certain extent, and have certain market competitiveness. Therefore, the recent research and development of electrode materials for sodium-ion batteries has attracted widespread attention, and has gradually become a hot topic in the field of battery materials and energy storage technology. [0003] Na 3 V 2 (PO 4 ) 3 It is an important electrode material for sodium ion batteries and a typical representative of electrode materials for polyanionic sodium ion batteries. Na 3 V 2 (PO 4 ) 3 It has a large three-dimens...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054B82Y30/00
CPCY02E60/10
Inventor 赵海雷赵丽娜杜志鸿李兆麟张子佳张旸
Owner UNIV OF SCI & TECH BEIJING
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