Na3V2(PO4)3/C composite material with quantum dot structure and preparation method thereof

A technology of carbon composite materials and sodium vanadium phosphate, which is applied in structural parts, electrical components, electrochemical generators, etc., can solve problems such as difficulties in electron and ion transmission, high price of graphene, and limitations of practical applications, etc., to optimize the electronic structure , excellent physical and chemical properties, and good application prospects

Active Publication Date: 2018-11-13
山东济清科技服务有限公司
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Problems solved by technology

However, it also has inherent defects, such as: low crystallinity, low conductivity, large sodium ion radius, etc., which lead to easy formation of solid-electrolyte interface, structural changes during charge and discharge, and electron and ion transport. Difficulty, etc.
[0003] Researchers have carried out studies on nano-carbon coatings, carbon nanotubes and graphene to improve their conductivity, for example, Jiexin Zhang (Graphene-Scaffolded Na3V2(PO4)3 Microsphere Cathode with High Rate Capability and Cycling Stability for Sodium Ion Batteries , ACSAppl.Mater.Interfaces, 9,8, 7177-7184) et al. form porous microsphere positive electrode material by embedding nanocrystal Na3V2(PO4)3 in graphene sheet, the first discharge specific capacity of 0.2C is 115mAh / g, but Due to the relatively high price of graphene, it is difficult to industrialize; the Na2MPO4F and Na2FexM1- The xPO4F cathode material has a specific capacity of 110m A h / g at 0.1C, but because of the presence of fluorine, it has a greater impact on the environment, which seriously limits their practical application; Chinese patent document CN106920946A discloses an oxidation Aluminum and carbon composite coating sodium vanadium fluorophosphate positive electrode material and preparation method, although the prepared sodium vanadium phosphate can improve the electrochemical performance, but its practical application is also restricted due to the harmfulness of fluorine

Method used

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  • Na3V2(PO4)3/C composite material with quantum dot structure and preparation method thereof
  • Na3V2(PO4)3/C composite material with quantum dot structure and preparation method thereof
  • Na3V2(PO4)3/C composite material with quantum dot structure and preparation method thereof

Examples

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Effect test

Embodiment 1

[0042] A preparation method of sodium vanadium phosphate / carbon composite material with quantum dot structure, the steps are as follows:

[0043] (1) Soak 1.5g of bamboo pulp in 50ml of deionized water for 30min, add 0.75mg of polyethylene oxide and stir evenly, then ball mill for 1h to obtain wet bamboo pulp;

[0044] (2) Put 4.68g of sodium dihydrogen phosphate and 2.34g of ammonium metavanadate in a beaker, add 80ml of water, heat and dissolve in a water bath at 80°C and stir for 40min to obtain a uniform mixed solution;

[0045] (3) Gradually add the mixed solution of step (2) into the wet bamboo pulp of step (1) under stirring conditions, stir it at 80°C for 40min, place it in the reaction kettle for hydrothermal treatment at 180°C for 24h, dehydrate and separate it in After drying at 60°C, a black-green powder precursor is obtained;

[0046] (4) Treat the precursor obtained in step (3) under a nitrogen atmosphere at a rate of 3 °C / min to 350 °C for 5 hours, and then tak...

Embodiment 2

[0050] A preparation method of sodium vanadium phosphate / carbon composite material with quantum dot structure, the steps are as follows:

[0051] (1) Soak 1 g of poplar pulp in 50 ml of deionized water for 30 minutes, add 0.15 mg of sodium metaphosphate and stir evenly, then ball mill for 1 hour to obtain wet poplar pulp;

[0052] (2) Put 0.82g of sodium acetate, 2.44g of sodium metavanadate, and 3.96g of ammonium dihydrogen phosphate into a beaker, add 80ml of water, heat and dissolve in a water bath at 80°C and stir for 60min to obtain a uniform mixed solution;

[0053] (3) Gradually add the mixed solution of step (2) into the wet poplar pulp of step (1) under stirring conditions, stir it at 80°C for 30min, place it in the reactor for hydrothermal treatment at 160°C for 36h, dehydrate, separate and After drying at 60°C, a black-green powder precursor is obtained;

[0054] (4) Treat the precursor obtained in step (3) under a nitrogen atmosphere at a rate of 2 °C / min to 300 °...

Embodiment 3

[0057] A preparation method of sodium vanadium phosphate / carbon composite material with quantum dot structure, the steps are as follows:

[0058] (1) Soak 2 g of cotton pulp in 50 ml of deionized water for 30 minutes, add 1.5 mg of polyacrylamide and stir evenly, then ball mill for 1 hour to obtain wet cotton pulp;

[0059] (2) Put 1.84g of sodium vanadate, 3.96g of diammonium hydrogen phosphate, and 1.17g of ammonium metavanadate into a beaker, add 80ml of water, heat and dissolve in a water bath at 80°C and stir for 30min to obtain a uniform mixed solution;

[0060] (3) Gradually add the mixed solution of step (2) into the wet cotton pulp of step (1) under stirring conditions, stir it at 80°C for 60min, place it in the reaction kettle for hydrothermal treatment at 200°C for 12h, dehydrate and separate it in After drying at 60°C, a black-green powder precursor is obtained;

[0061] (4) Treat the precursor obtained in step (3) under a nitrogen atmosphere at a rate of 5 °C / min...

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Abstract

The invention relates to a Na3V2(PO4)3 / C composite material with a quantum dot structure and a preparation method thereof. The Na3V2(PO4)3 / C composite material with the quantum dot structure is obtained by taking paper pulp, a sodium source, a vanadium source and a phosphorus source as raw materials and carrying out hydrothermal and carbothermal reduction thermal treatment; the Na3V2(PO4)3 / C composite material not only has the characteristics of low cost and simple preparation technology, but also is beneficial for transmission of sodium ions and volume expansion regulation caused during an embedding / uplugging process of the sodium ions, the electrochemical performance of the Na3V2(PO4)3 / C composite material can be improved, a good application prospect is obtained, and remarkable economicand social benefit can be obtained.

Description

technical field [0001] The invention relates to a sodium vanadium phosphate / carbon composite material with a quantum dot structure and a preparation method thereof, belonging to the technical field of positive electrode materials for sodium ion batteries. Background technique [0002] Sodium vanadium phosphate (Na 3 V 2 (PO 4 ) 3 ) is considered to be the preferred cathode material for sodium-ion batteries due to its low cost, strong cycle capacity, high safety, and good thermal stability, with a theoretical specific capacity of 117.6mAh / g. However, it also has inherent defects, such as: low crystallinity, low conductivity, large sodium ion radius, etc., which lead to easy formation of solid-electrolyte interface, structural changes during charge and discharge, and electron and ion transport. Difficulty etc. [0003] Researchers have carried out studies on nano-carbon coatings, carbon nanotubes and graphene to improve their conductivity, for example, Jiexin Zhang (Graph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/362H01M4/5825H01M4/62H01M4/625H01M4/628H01M10/054Y02E60/10
Inventor 张旭东张起豪何文
Owner 山东济清科技服务有限公司
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