Vanadium phosphate nano material with porous network structure and preparation method thereof

A vanadium phosphate nanometer and network structure technology, applied in structural parts, chemical instruments and methods, phosphorus compounds, etc., can solve the problems of poor electrical conductivity of electrode materials, and achieve the effects of low production cost, simple operation process and high capacity.

Active Publication Date: 2020-01-10
CHINA-SINGAPORE INT JOINT RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is in order to solve the VPO in the prior art 4 To solve the problem of poor conductivity of electrode materials, provide a vanadium phosphate nanomaterial with high purity, good crystallinity and excellent conductivity and a porous network structure and its preparation method

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  • Vanadium phosphate nano material with porous network structure and preparation method thereof
  • Vanadium phosphate nano material with porous network structure and preparation method thereof
  • Vanadium phosphate nano material with porous network structure and preparation method thereof

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Embodiment 1

[0051] This embodiment discloses a vanadium phosphate nanomaterial with high purity, good crystallinity, and excellent electrical conductivity and a porous network structure, and a preparation method. The vanadium phosphate nanomaterial is applied to the negative electrode material of a lithium ion battery. First, chemical vapor deposition ( CVD) to grow a graphene foam structure, and then use a hydrothermal method to grow porous, uniformly distributed vanadium phosphate (VPO) on the self-supporting graphene foam structure. 4 ) network nanomaterials, in vanadium phosphate (VPO 4 ) into the precursor solution of citric acid to carry out carbon mixing treatment, so that the conductivity of the material is further improved.

[0052] This embodiment proposes a vanadium phosphate nanomaterial with a porous network structure as a lithium-ion battery negative electrode material and a preparation method thereof, the steps of which include:

[0053] 1) Dissolve low-priced vanadium sou...

Embodiment 2

[0064] In the synthesis process of the self-supporting vanadium phosphate / graphene foam composite nanomaterial, the following steps are mainly involved:

[0065] 1) Dissolve 0.364g of vanadium pentoxide, 0.460g of ammonium dihydrogen phosphate, and 0.96g of citric acid in 30mL of DI water, and stir at 80°C for 2h;

[0066] 2) After the mixed solution in step 1) is stirred, use concentrated ammonia water to adjust the pH value of the solution to 7, then transfer the reaction solution to a 50mL reaction kettle, and react in an oven at 200°C for 20h;

[0067] 3) After step 2) the reaction is finished, cool to room temperature, and collect the self-supporting vanadium phosphate / graphene composite nanomaterial;

[0068] 4) Rinse the sample obtained in step 3) three times with deionized water, and dry the self-supporting electrode material in an oven at 80°C;

[0069] 5) Put the dried sample in step 4) for calcination in a tube furnace, place it in an argon atmosphere, and pre-calc...

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Abstract

The invention discloses a vanadium phosphate nano material with a porous network structure and a preparation method thereof, and the vanadium phosphate nano material is used for a lithium ion batterycathode material. The preparation method comprises the following steps: firstly, growing self-supporting graphene foam by a chemical vapor deposition method, and loading a vanadium phosphate (VPO4) nano material on a graphene foam substrate by a hydrothermal method to improve the conductivity and ionic conductivity of the graphene foam substrate. The vanadium phosphate nano material with the porous network structure can be used as negative electrode materials of lithium ion batteries and has good lithium ion energy storage behavior, and the charging capacity can reach 424.4 mAh g<-1> at a current density of 0.2A g<-1>; after 3,000 cycles of charging and discharging, the capacity maintenance rate still reaches above 50.3%. The preparation method of the vanadium phosphate nano material is simple, avoids the tedious process of preparing electrode sheets by the traditional process, greatly reduces the cost problem of battery assembly, and can realize green mass production.

Description

technical field [0001] The invention relates to the technical field of energy storage and conversion, in particular to a vanadium phosphate nanomaterial with a porous network structure applied to the negative electrode material of a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion battery is a new type of electrochemical energy. Since it was commercialized by Sony Corporation of Japan in 1992, it has developed very rapidly and gradually replaced nickel-chromium batteries and nickel-metal hydride batteries, becoming the third generation of small energy storage batteries. It has the advantages of high working voltage, large capacity, long cycle life, and safety, and is widely used in various fields, including smart grids, mobile devices, and new energy electric vehicles. Although lithium-ion batteries have achieved great success in human life (electronic equipment), some large-scale equipment (full electric vehicles) have put forw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58H01M4/62H01M10/0525
CPCC01B25/45C01P2002/72C01P2004/01C01P2004/03C01P2006/40H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 申泽骧蒋海凤来琳斐
Owner CHINA-SINGAPORE INT JOINT RES INST
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