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Preparation of Na3V2(PO4)2F3/carbon compound and application of same

A technology of sodium vanadium fluorophosphate and carbon composites, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of high energy consumption and complicated preparation process, and achieve low energy consumption, large specific surface area, transmission The effect of reducing the resistance

Active Publication Date: 2019-05-14
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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  • Preparation of Na3V2(PO4)2F3/carbon compound and application of same
  • Preparation of Na3V2(PO4)2F3/carbon compound and application of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: (VPO 4 Preparation of Na by Solvothermal-Ball Milling 3 V 2 (PO 4 ) 2 f 3 / C complex)

[0017] Weigh 0.315g sodium fluoride (both as fluorine source and sodium source), 0.649g vanadium phosphate (both as vanadium source and phosphate), 0.3g SDS (sodium dodecyl sulfate), and add to 100mL In a hydrothermal kettle, add 25ml of ethanol and 25ml of deionized water, and react at 180°C for 48h. The resulting mixed solution was filtered with filter paper, washed 3 times with deionized water and ethanol, and then placed in an oven at 120 °C for 12 h to obtain Na 3 V 2 (PO 4 ) 2 f 3 . 1.35g Na 3 V 2 (PO4 ) 2 f 3 Add 0.15g KB (Ketjen black) into the ball mill jar, then add 30g agate balls and mill for 2h (rotating speed is 580rpm), to obtain Na 3 V 2 (PO 4 ) 2 f 3 / C complex.

Embodiment 2

[0018] Embodiment 2: (NH 4 VO 3 Preparation of Na by Solvothermal-Ball Milling 3 V 2 (PO 4 ) 2 f 3 / C complex)

[0019] 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, add to 100mL In a 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 3 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 . 1.3g Na 3 V 2 (PO 4 ) 2 f 3 Add 0.2g acetylene black to the ball mill jar, then add 25g agate balls to mill for 4h (rotating speed is 580rpm) to get Na 3 V 2 (PO 4 ) 2 f 3 / C complex.

Embodiment 3

[0020] Embodiment 3: (V 2 o 5 Preparation of Na by Solvothermal-Ball Milling 3 V 2 (PO 4 ) 2 f 3 / C complex)

[0021] Weigh 0.278g sodium fluoride, 0.300g sodium hydroxide, 0.455g vanadium pentoxide, 0.5752g ammonium dihydrogen phosphate, 1.0507g citric acid monohydrate, add to a 100mL hydrothermal kettle, add 25ml acetone and 25ml to Ionized water, react at 120°C for 48h. The resulting mixed solution was filtered with filter paper, washed 3 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 . 1.35g Na 3 V 2 (PO 4 ) 2 f 3 Add 0.15g Ketjen Black to the ball mill jar, then add 25g agate balls and mill 4h (rotating speed is 580rpm), to obtain Na 3 V 2 (PO 4 ) 2 f 3 / C complex.

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Abstract

The invention belongs to the field of a sodium ion battery positive electrode material, and particularly relates to preparation of a Na3V2(PO4)2F3 / carbon compound and application of the same. The constitution of the positive electrode material is Na3V2(PO4)2F3. The Na3V2(PO4)2F3 is prepared by a low-temperature and green solvothermal-ball milling method. Compared with a traditional ball-milling method, the preparation of the material does not need high-temperature calcination, the energy consumption is relatively low, and the preparation is green and environment-friendly. Through electrochemical performance test, the Na3V2(PO4)2F3 / C compound shows discharging specific capacity approximate to theoretical specific capacity and excellent rate performance and has good application prospect in portable electronic equipment and rapid charge-discharge equipment.

Description

technical field [0001] The invention relates to the field of positive electrode materials for sodium ion batteries, in particular to the preparation and application of a vanadium sodium fluorophosphate / carbon compound. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/054
CPCY02E60/10
Inventor 张华民郑琼易红明李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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