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A kind of ruthenium-doped carbon-coated sodium vanadium phosphate cathode material and preparation method thereof

A technology of carbon-coated sodium vanadium phosphate and positive electrode materials, applied in battery electrodes, structural parts, electrical components, etc., can solve problems such as low electronic conductivity and ion migration rate, limited charge and discharge capacity, and affect high specific capacity. Achieve the effect of improving electrochemical performance, improving intrinsic electronic conductivity, and simplifying the reaction process

Active Publication Date: 2021-01-15
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, sodium vanadium phosphate also has disadvantages, that is, its electronic conductivity and ion migration rate are low, which not only affects its high specific capacity, but also limits its charge and discharge ability under high current.

Method used

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  • A kind of ruthenium-doped carbon-coated sodium vanadium phosphate cathode material and preparation method thereof
  • A kind of ruthenium-doped carbon-coated sodium vanadium phosphate cathode material and preparation method thereof
  • A kind of ruthenium-doped carbon-coated sodium vanadium phosphate cathode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] The present embodiment prepares sodium vanadium phosphate cathode material Na according to the following steps 3 V 2 (PO 4 ) 3 / C(x=0):

[0030] (1) According to the molar ratio of Na:V:P:C=3:2:3:2, weigh Na 2 CO 3 0.0075mol, NH 4 VO 3 0.01mol, NH 4 h 2 PO 4 0.015mol, citric acid 0.01mol;

[0031] (2) NH 4 VO 3 Mix with 0.01mol oxalic acid, add 50mL deionized water to dissolve, stir and heat in a water bath at 60°C until it is completely dissolved, and then add Na 2 CO 3 and NH 4 h 2 PO 4 Miscible in deionized water and dropwise into the above solution, stirred and heated in a water bath at 90°C for 40 minutes to form a mixed solution; then miscible citric acid and 10mL PEG-400 in deionized water, then added the above mixed solution , continue stirring and heating for 3.5h to form a gel; dry the gel in vacuum and then grind it for a period of time to obtain a mixed powder;

[0032] (3) Heat the mixed powder at 2°C / min to 350°C for 4 hours in a tube ...

Embodiment 2

[0037] The present embodiment prepares sodium vanadium phosphate cathode material Na according to the following steps 3 V 1.9 Ru 0.1 (PO 4 ) 3 / C(x=0.1):

[0038] (1) According to the molar ratio of Na:V:Ru:P:C=3:1.9:0.1:3:2, weigh Na 2 CO 3 0.0075mol, NH 4 VO 3 0.0095, RuCl 3 0.0005mol, NH 4 h 2 PO 4 0.015mol, citric acid 0.01mol;

[0039] (2) NH 4 VO 3Mix with 0.01mol oxalic acid, add 50mL deionized water to dissolve, stir and heat in a water bath at 60°C until it is completely dissolved, and then add Na 2 CO 3 and NH 4 h 2 PO 4 Miscible in deionized water and dropwise added to the above solution, stirred and heated in a water bath at 90°C for 40 minutes to form a mixed solution; then RuCl 3 , citric acid and 10mL PEG-400 were miscible in deionized water, added to the above mixture, continued to stir and heat for 3.5h to form a gel; vacuum dried the gel and then ground it for a period of time to obtain a mixed powder;

[0040] (3) Heat the mixed powder ...

Embodiment 3

[0045] The present embodiment prepares sodium vanadium phosphate cathode material Na according to the following steps 3 V 1.85 Ru 0.15 (PO 4 ) 3 / C(x=0.15):

[0046] (1) According to the molar ratio of Na:V:Ru:P:C=3:1.85:0.15:3:2, weigh Na 2 CO 3 0.0075mol, NH 4 VO 3 0.00925mol, RuCl 3 0.00075mol, NH 4 h 2 PO 4 0.015mol, citric acid 0.01mol;

[0047] (2) NH 4 VO 3 Mix with 0.01mol oxalic acid, add 50mL deionized water to dissolve, stir and heat in a water bath at 60°C until it is completely dissolved, and then add Na 2 CO 3 and NH 4 h 2 PO 4 Miscible in deionized water and dropwise added to the above solution, stirred and heated in a water bath at 90°C for 40 minutes to form a mixed solution; then RuCl 3 , citric acid and 10mL PEG-400 were miscible in deionized water, added to the above mixture, continued to stir and heat for 3.5h to form a gel; vacuum dried the gel and then ground it for a period of time to obtain a mixed powder;

[0048] (3) Heat the mixe...

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Abstract

The invention discloses a vanadium sodium phosphate cathode material doped with ruthenium and wrapped in carbon and a preparation method of the cathode material. A vanadium sodium phosphate electrodematerial is doped with ruthenium ions and wrapped in carbon. The first discharge capacitor and circulation performance of the vanadium sodium phosphate cathode material are improved, the method is simple, and the material is easy to produce in batch and popularize and use.

Description

technical field [0001] The invention relates to a preparation method of a sodium ion battery positive electrode material, in particular to a preparation method of a ruthenium-doped carbon-coated vanadium sodium phosphate positive electrode material Background technique [0002] Lithium-ion batteries have been widely used in various portable electronic products and devices due to their high energy density, long cycle life and no memory effect. Especially under the dual pressure of energy crisis and environmental degradation, human society will become more and more dependent on lithium-ion batteries, and the demand for lithium will increase. However, the distribution of lithium content in the earth's crust is uneven, and it is difficult to meet such a large demand, resulting in rising prices of lithium sources, which cannot meet the needs of social development. Therefore, it is urgent to develop a new generation of new energy storage battery systems with good comprehensive pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/58H01M10/054
CPCH01M4/366H01M4/5825H01M4/583H01M4/625H01M10/054Y02E60/10
Inventor 张大伟张宸尉蒋洋杨庆春
Owner HEFEI UNIV OF TECH
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