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A kind of sodium vanadium fluorophosphate and carbon composite and its preparation and application

A technology of sodium vanadium fluorophosphate and carbon composites, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of complex preparation process and high energy consumption, achieve large specific surface area, improve rate performance, and excellent discharge specific capacity Effect

Active Publication Date: 2022-07-05
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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  • A kind of sodium vanadium fluorophosphate and carbon composite and its preparation and application
  • A kind of sodium vanadium fluorophosphate and carbon composite and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: (VPO 4 Preparation of Na by In-situ Carbonization at Low Temperature 3 V 2 (PO 4 ) 2 F 3 carbon composite)

[0023] Weigh 0.315g sodium fluoride (both fluorine source and sodium source), 0.649g vanadium phosphate (both vanadium source and phosphate), 0.3g SDS (sodium dodecyl sulfate), 1.2g glucose, Put it into a 100 mL hydrothermal kettle, add 25 mL of ethanol and 25 mL of deionized water, and react at 180° C. for 48 hours. The obtained mixed solution was filtered with filter paper, then washed with deionized water and ethanol for 3 times, 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 sodium metal sheet is used as the negative electrode, the glass fiber membrane is used as the separator, and the solute is 1M NaClO 4, solvent EC (ethylene carbonate) and DEC (diethyl carbonate) mixture (mass ratio 1:1...

Embodiment 2

[0024] Example 2: (NH 4 VO 3 Preparation of Na by In-situ Carbonization at Low Temperature 3 V 2 (PO 4 ) 2 F 3 carbon composite)

[0025] Weigh 0.315g sodium fluoride (both 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, Put it into a 100 mL hydrothermal kettle, add 25 mL of acetone and 25 mL of deionized water, and react at 140 °C for 36 h. The obtained mixed solution was filtered with filter paper, then washed with deionized water and ethanol for 3 times, 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] Example 3: (V 2 O 5 Preparation of Na by In-situ Carbonization at Low Temperature 3 V 2 (PO 4 ) 2 F 3 carbon composite)

[0027] Weigh 0.278g of ammonium fluoride, 0.300g of sodium hydroxide, 0.455g of vanadium pentoxide, 0.5752g of ammonium dihydrogen phosphate, 1.0507g of citric acid monohydrate, and 1.5g of sucrose, add them to a 100mL hydrothermal kettle, and add 25ml of Acetone and 25ml of deionized water were reacted at 120°C for 48h. The obtained mixed solution was filtered with filter paper, then washed with deionized water and ethanol for 3 times, 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 composite of sodium vanadium fluorophosphate and carbon and a preparation method and application thereof. The positive electrode material is composed of Na 3 V 2( PO 4 ) 2 F 3 Carbon Complex, Na 3 V 2 (PO 4 ) 2 F 3 Carbon complexes were prepared in one step using low temperature green solvothermal synthesis of Na 3 V 2( PO 4 ) 2 F 3 In the process of adding a carbon source, through the in-situ carbonization of the carbon source, in Na 3 V 2( PO 4 ) 2 F 3 A carbon layer is formed on the surface to obtain Na 3 V 2( PO 4 ) 2 F 3 carbon composite. Compared with the general solvothermal method, by introducing a carbon source, under the same reaction conditions, in Na 3 V 2( PO 4 ) 2 F 3 A carbon layer is formed on the surface, which effectively increases the Na 3 V 2 ( PO 4 ) 2 F 3 The electrical conductivity of the material is reduced and the particle size is reduced, thereby improving the rate capability of the material. prepared Na 3 V 2 (PO 4 ) 2 F 3 Through the electrochemical performance test, the carbon composite exhibits a discharge specific capacity close to the theoretical specific capacity and excellent rate performance, and has a good application prospect in portable electronic devices and fast charging and discharging devices.

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 power grid. Energy storage technology is the 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 wid...

Claims

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Application Information

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Patent Type & Authority Patents(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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