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Sodium vanadium fluorophosphate and carbon compound and preparation method and application thereof

A technology of sodium vanadium fluorophosphate and carbon composites, which is applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of high energy consumption and complicated preparation process, achieve large specific surface area, improve rate performance, prevent The effect of reunion

Active Publication Date: 2019-06-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the current reports, the preparation methods of sodium vanadium phosphate are mainly sol-gel method and ball milling method. These two methods need to go through the process of medium and high temperature pre-sintering (300°C-400°C) and high-temperature calcination phase formation. , high energy consumption, and complicated preparation process

Method used

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  • Sodium vanadium fluorophosphate and carbon compound and preparation method and application thereof
  • Sodium vanadium fluorophosphate and carbon compound and preparation method and application thereof
  • Sodium vanadium fluorophosphate and carbon compound and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1: (VPO 4 Preparation of Na by Low Temperature In Situ Carbonization 3 V 2 (PO 4 ) 2 f 3 carbon composite)

[0023] Weigh 0.315g sodium fluoride (both as fluorine source and sodium source), 0.649g vanadium phosphate (both as vanadium source and phosphate), 0.3gSDS (sodium dodecyl sulfate), 1.2g glucose, Add it to a 100mL hydrothermal kettle, add 25ml ethanol and 25ml deionized water, and react at 180°C for 48h. The resulting mixed solution was filtered with filter paper, washed three times with deionized water and ethanol, and then placed in an oven at 120 °C for 8 h to obtain Na 3 V 2 (PO 4 ) 2 f 3 carbon composite. The prepared Na 3 V 2 (PO 4 ) 2 f 3 The carbon composite is used as the positive electrode, the metal sodium sheet is used as the negative electrode, the glass fiber membrane is used as the separator, and the solute is 1MNaClO 4, the solvent EC (ethylene carbonate) and DEC (diethyl carbonate) mixture (mass ratio 1:1), the additiv...

Embodiment 2

[0024] Embodiment 2: (NH 4 VO 3 Preparation of Na by Low Temperature In Situ Carbonization 3 V 2 (PO 4 ) 2 f 3 carbon composite)

[0025] Weigh 0.315g sodium fluoride (both as fluorine source and sodium source), 0.585g ammonium metavanadate, 0.5752g ammonium dihydrogen phosphate, 1.0507g citric acid monohydrate, 0.3g PEG-6000, 0.9g starch, Add it to a 100mL hydrothermal kettle, add 25ml of acetone and 25ml of deionized water, and react at 140°C for 36h. The resulting mixed solution was filtered with filter paper, washed three times with deionized water and ethanol, and then placed in an oven at 120 °C for 8 h to obtain Na 3 V 2 (PO 4 ) 2 f 3 carbon composite.

Embodiment 3

[0026] Embodiment 3: (V 2 o 5 Preparation of Na by Low Temperature In Situ Carbonization 3 V 2 (PO 4 ) 2 f 3 carbon composite)

[0027] Weigh 0.278g ammonium fluoride, 0.300g sodium hydroxide, 0.455g vanadium pentoxide, 0.5752g ammonium dihydrogen phosphate, 1.0507g citric acid monohydrate, 1.5g sucrose, add to a 100mL hydrothermal kettle, add 25ml Acetone and 25ml deionized water were reacted at 120°C for 48h. The resulting mixed solution was filtered with filter paper, washed three times with deionized water and ethanol, and then placed in an oven at 120 °C for 8 h to obtain Na 3 V 2 (PO 4 ) 2 f 3 carbon composite.

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Abstract

The invention relates to a sodium vanadium fluorophosphate and carbon compound and a preparation method and application thereof. The composition of a positive electrode material is Na3V2(PO4)2F3 carbon compound which is prepared by low-temperature green solvothermal in one step, a carbon source is added during the solvothermal synthesis of Na3V2(PO4)2F3, a carbon layer is formed on the surface ofNa3V2(PO4)2F3 by in-situ carbonization of the carbon source, and the Na3V2(PO4)2F3 carbon compound is obtained. Compared with a general solvothermal method, by introducing the carbon source, under thesame reaction condition, the carbon layer is formed on the surface of Na3V2(PO4)2F3, the conductivity of Na3V2(PO4)2F3 is effectively improved, particles are reduced, and the rate performance of a material is improved. The prepared Na3V2(PO4)2F3 carbon compound passes an electrochemical performance test and exhibits a specific discharge capacity close to a theoretical specific capacity and excellent rate performance, and the sodium vanadium fluorophosphate and carbon compound has good application prospects in a portable electronic device and a fast charge and discharge device.

Description

technical field [0001] The invention relates to the technical field of sodium ion batteries, in particular to the field of positive electrode materials for sodium ion batteries. Background technique [0002] Energy is an important driving force for social development. The energy currently used is mainly divided into renewable energy (wind energy, water energy, solar energy, etc.) and non-renewable energy (coal, oil, natural gas, etc.). Due to the shortage of non-renewable energy resources and serious environmental pollution, the development of renewable energy has attracted more and more attention. However, renewable energy is discontinuous and unstable, and its direct connection to the grid will have a great impact on the grid. Energy storage technology is a key technology to solve the discontinuous and unstable renewable energy. Among many energy storage technologies, lithium-ion batteries have the advantages of high energy density and long cycle life, and are widely used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCY02E60/10
Inventor 郑琼张华民易红明李先锋凌模翔
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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