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Graphene composite silicon doped sodium vanadium phosphate composite material and preparation method and application thereof

A graphene composite and composite material technology, applied in the fields of nanomaterials and electrochemistry, can solve the problems of conductivity limiting the application and development of sodium vanadium phosphate, and achieve the effects of excellent cycle performance, excellent rate performance, and excellent long life.

Pending Publication Date: 2022-08-05
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, low conductivity limits the application and development of sodium vanadium phosphate

Method used

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  • Graphene composite silicon doped sodium vanadium phosphate composite material and preparation method and application thereof
  • Graphene composite silicon doped sodium vanadium phosphate composite material and preparation method and application thereof
  • Graphene composite silicon doped sodium vanadium phosphate composite material and preparation method and application thereof

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Embodiment 1

[0041] The preparation method of graphene composite silicon-doped sodium vanadium phosphate composite material, comprising the following steps:

[0042] (1) 4 mmol NH 4 VO 3 Add it to a certain amount of deionized water, and stir it for 15 minutes in a water bath at 70°C to dissolve it;

[0043] (2) 6 mmol C 2 H 2 O 4 Add it to the solution obtained in step (1), and stir it for 15 min under water bath conditions to dissolve it;

[0044] (3) 2.8 mmol Na 2 CO 3 Add it to the solution obtained in step (2), and stir it for 15 min under water bath conditions to dissolve it;

[0045] (4) 0.2 mmol Na 2 SiO 3Add it to the solution obtained in step (3), and stir it for 15 min under water bath conditions to dissolve it;

[0046] (5) 5.8 mmol NH 4 H 2 PO 4 Add it to the solution obtained in step (4), and stir it for 15 min under water bath conditions to dissolve it;

[0047] (6) pouring the solution obtained in step (5) into a polytetrafluoroethylene liner, and hydrothermal...

Embodiment 2

[0056] The preparation method of graphene composite silicon-doped sodium vanadium phosphate composite material comprises the following steps:

[0057] (1) 4 mmol V 2 O 5 Add it to a certain amount of deionized water, and stir it for 15 minutes in a water bath at 70 °C to dissolve it;

[0058] (2) 6 mmol C 2 H 2 O 4 Add it to the solution obtained in step (1), and stir it for 15 min under water bath conditions to dissolve it;

[0059] (3) 2.98mmol Na 2 CO 3 Add it to the solution obtained in step (2), and stir it for 15 min under water bath conditions to dissolve it;

[0060] (4) 0.02mmol Na 2 SiO 3 Add it to the solution obtained in step (3), and stir it for 15 min under water bath conditions to dissolve it;

[0061] (5) 5.98mmol NH 4 H 2 PO 4 Add it to the solution obtained in step (4), and stir it for 15 min under water bath conditions to dissolve it;

[0062] (6) pouring the solution obtained in step (5) into a polytetrafluoroethylene liner, and hydrothermally...

Embodiment 3

[0069] The preparation method of graphene composite silicon-doped sodium vanadium phosphate composite material comprises the following steps:

[0070] (1) 4 mmol NH 4 VO 3 Add it to a certain amount of deionized water, and stir it for 15 minutes in a water bath at 70 °C to dissolve it;

[0071] (2) 4mmol C 6 H 8 O 7 Add it to the solution obtained in step (1), and stir it for 15 min under water bath conditions to dissolve it;

[0072] (3) 5.4 mmol NaHCO 3 Add it to the solution obtained in step (2), and stir it for 15 min under water bath conditions to dissolve it;

[0073] (4) 0.3 mmol Na 2 SiO 3 Add it to the solution obtained in step (3), and stir it for 15 min under water bath conditions to dissolve it;

[0074] (5) 5.7mmol NH 4 H 2 PO 4 Add it to the solution obtained in step (4), and stir it for 15 min under water bath conditions to dissolve it;

[0075] (6) Pour the solution obtained in step (5) into a polytetrafluoroethylene liner, and perform a hydrotherm...

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Abstract

The invention discloses a graphene composite silicon doped sodium vanadium phosphate composite material. The invention also discloses a preparation method of the graphene composite silicon doped sodium vanadium phosphate composite material, which comprises the following steps: sequentially dissolving a vanadium source, a carbon source, a sodium source, a silicon source and a phosphorus source in deionized water, preparing a precursor by adopting a hydrothermal method, mixing the precursor with graphene, stirring, drying, grinding and calcining to obtain nanoscale Na3V2 (PO4) 3-x (SiO4) x (at) rGO (x is more than 0.01 and less than 0.2) particles. The graphene composite silicon doped sodium vanadium phosphate composite material prepared by the invention is in a nano-particle shape, shortens the sodium ion migration path, increases the contact area between an electrode plate and an electrolyte, and improves the conductivity of the material, expands the ion migration channel and enhances the stability of a battery by means of doping and compounding with graphene; and the electrochemical performance of high capacity and long cycle life is shown in a battery test.

Description

technical field [0001] The present invention relates to the technical field of nanomaterials and electrochemistry. More specifically, the present invention relates to a graphene composite silicon-doped sodium vanadium phosphate composite material and its preparation method and application. Background technique [0002] At present, lithium-ion batteries are the main applications in our daily life, but with the increase in demand, we are faced with problems such as shortage of lithium resources and recycling of lithium elements. As a congener element of lithium, sodium has the advantages of abundant resources and low cost, and has similar physical and chemical properties to lithium. [0003] Sodium ion cathode materials mainly include layered transition metal oxides, tunnel oxides, polyanionic materials, Prussian blue compounds, etc. Layered transition metal oxides generally have a large capacity, but the output voltage is low, the phase transition during charge and discharg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36B82Y30/00C01B25/45C01B32/194C01B33/00H01M4/58H01M4/62H01M10/054
CPCH01M4/362H01M4/5825H01M4/625H01M10/054C01B25/45C01B33/00C01B32/194B82Y30/00C01P2004/64C01P2004/80Y02E60/10
Inventor 周成冈孙睿敏窦明月韩波夏开胜高强
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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