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Sodium vanadium phosphate composite electrode material as well as preparation method and application thereof

A composite electrode, sodium vanadium phosphate technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as unsatisfactory rate performance, difficulty in reaching theoretical specific capacity, adverse effects, etc.

Inactive Publication Date: 2017-12-01
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And, Na 3 V 2 (PO 4 ) 3 The poor electronic conductivity makes it difficult to reach its theoretical specific capacity during charge and discharge, which leads to unsatisfactory rate performance
These strongly affect 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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  • Sodium vanadium phosphate composite electrode material as well as preparation method and application thereof
  • Sodium vanadium phosphate composite electrode material as well as preparation method and application thereof
  • Sodium vanadium phosphate composite electrode material as well as preparation method and application thereof

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Embodiment 1

[0082] A kind of preparation method of sodium vanadium phosphate composite electrode material that present embodiment relates to, described preparation method is as follows:

[0083] (1) selection of raw material: present embodiment selects described vanadium source as V 2 o 5 , the phosphorus source is NH 4 h 2 PO 4 , the sodium source is Na 2 CO 3 , the organic reducing agent is ascorbic acid, the titanium source is tetrabutyl titanate C 16 h 36 o 4 Ti, the carbon source is polyethylene glycol-400 (PEG-400) and ascorbic acid;

[0084] (2) The amount of raw materials: the V 2 o 5 mass m 1 is 0.728g; the NH 4 h 2 PO 4 mass m 2 is 1.380g; the Na 2 CO 3 mass m 3 is 0.636g; the quality m of the tetrabutyl titanate 4 is 0g; the mass m of the ascorbic acid 5 Is 1.507g; The volume V of the polyethylene glycol-400 (PEG-400) 0is 6ml and the deionized water volume V is 70ml.

[0085] (3) Preparation of mixed solution: under continuous stirring conditions, first, d...

Embodiment 2

[0094] A kind of preparation method of sodium vanadium phosphate composite electrode material that present embodiment relates to, described preparation method is as follows:

[0095] (1) selection of raw material: present embodiment selects described vanadium source as V 2 o 5 , the phosphorus source is NH 4 h 2 PO 4 , the sodium source is Na 2 CO 3 , the organic reducing agent is ascorbic acid, the titanium source is tetrabutyl titanate C 16 h 36 o 4 Ti, the carbon source is polyethylene glycol-400 (PEG-400) and ascorbic acid;

[0096] (2) The amount of raw materials: the V 2 o 5 mass m 1 Is 0.709g; The NH 4 h 2 PO 4 mass m 2 is 1.380g; the Na 2 CO 3 mass m 3 is 0.636g; the quality m of the tetrabutyl titanate 4 Be 0.0680g; The quality m of described ascorbic acid 5 Is 1.507g; The volume V of the polyethylene glycol-400 (PEG-400) 0 is 6ml and the deionized water volume V is 70ml.

[0097] (3) Preparation C 16 h 36 o 4 Ti alcohol solution: first, measu...

Embodiment 3

[0108] The preparation method of a kind of sodium vanadium phosphate composite electrode material involved in this embodiment is basically the same as embodiment 2, only difference is:

[0109] Measure 8ml (tetrabutyl titanate quality m wherein) from described tetrabutyl titanate alcohol solution 4 0.136g) for the preparation of mixed solutions.

[0110] The V 2 o 5 mass m 1 It is 0.691g.

[0111] By a kind of Na of this embodiment 3 Ti x V 2-x (PO 4 ) 3 The Na obtained by the preparation method of / C composite electrode material 3 Ti x V 2-x (PO 4 ) 3 / C composite electrode material is Na 3 Ti 0.10 V 1.90 (PO 4 ) 3 / C composite electrode material.

[0112] figure 1 There is Na 3 Ti 0.10 V 1.90 (PO 4 ) 3 / C composite electrode material XRD diffraction pattern. Figure 2c for Na 3 Ti 0.10 V 1.90 (PO 4 ) 3 Electron micrographs of the / C composite electrode material. Figure 3a for Na 3 Ti 0.10 V 1.90 (PO 4 ) 3 Field emission transmission elect...

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Abstract

The invention relates to a sodium vanadium phosphate composite electrode material as well as a preparation method and application thereof. The sodium vanadium phosphate composite electrode material is a Na3TixV[2-x](PO4)3 / C composite electrode material with a core-shell structure. According to the preparation method, an organic reducing agent and a carbon source are selected, the carbon source can be thermally decomposed into amorphous carbon in the heat treatment process, the formed core refers to Na3TixV[2-x](PO4)3 / C particles, and the shell is a core-shell structure of the amorphous carbon. The unique nano-particle core-shell structure is capable of shortening the sodium ion transport path, improving the ionic conductivity of the material and improving the electronic conductivity through an in-situ coating carbon material, and has a huge promotion effect of improving the electrochemical performance of the Na3TixV[2-x](PO4)3 / C composite electrode material. The composite electrode material disclosed by the invention is widely applied to the technical field of energy storage material and secondary sodium-ion batteries. The invention belongs to the field of electrode materials.

Description

technical field [0001] The invention belongs to the field of electrode materials, and in particular relates to a sodium vanadium phosphate composite electrode material and a preparation method and application thereof. Background technique [0002] With the successful commercialization of lithium-ion batteries, the demand for lithium has greatly increased, while lithium reserves are limited and unevenly distributed, which is critical for the development of smart grids and large-scale energy storage for renewable energy that require low prices and high security. For long-life energy storage batteries, it will be a serious bottleneck problem. Therefore, it is urgent to develop a new energy storage battery system with excellent comprehensive performance for the next generation. Compared with lithium-ion batteries, sodium-ion batteries have the advantages of abundant sodium resources, low price and wide distribution. Therefore, Na-ion batteries have recently received much atten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/366H01M4/5825H01M4/625H01M4/628H01M10/054H01M2004/021Y02E60/10
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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