Graphene-loaded vanadium pentoxide composite material, preparation method thereof and application of graphene-loaded vanadium pentoxide composite material in aqueous zinc ion battery

A technology of vanadium pentoxide and vanadium pentoxide nanometer, applied in the field of new energy batteries, can solve the problems of low conductivity, poor cycle stability and the like

Pending Publication Date: 2022-03-15
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the defects such as low electrical conductivity and poor cycle stability in the vanadium pentoxide positive electrode material in the prior art, the first object of the present invention is to provide a kind of porous vanadium pentoxide nanosheet grown in situ on layered graphite Graphene-loaded vanadium pentoxide composite material composed of graphene surface and interlayer, the composite material has good electrical conductivity, high structural stability and high electrochemical activity

Method used

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  • Graphene-loaded vanadium pentoxide composite material, preparation method thereof and application of graphene-loaded vanadium pentoxide composite material in aqueous zinc ion battery
  • Graphene-loaded vanadium pentoxide composite material, preparation method thereof and application of graphene-loaded vanadium pentoxide composite material in aqueous zinc ion battery
  • Graphene-loaded vanadium pentoxide composite material, preparation method thereof and application of graphene-loaded vanadium pentoxide composite material in aqueous zinc ion battery

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Embodiment 1

[0044] 1.V 2 o 5 Preparation of the @graphene complex:

[0045] Measure 25mL of N,N-dimethylformamide (DMF) in a beaker, then weigh 50mg of graphene into it, and ultrasonically disperse it for 60min to obtain a uniform graphene dispersion, and then weigh 3mmol VCl 3 Add in the graphene dispersion liquid, stir to obtain homogeneous solution, be recorded as solution A; Then take by weighing 3mmol of terephthalic acid (H 2 BDC) was dissolved in 25mL of DMF, stirred evenly to obtain a homogeneous solution, which was recorded as solution B; under the state of magnetic stirring, solution B was added dropwise to solution A, and then the mixed solution was transferred to 100mL of polysulfide after stirring continuously for 60min. In the high-pressure reaction kettle lined with vinyl fluoride, seal the high-pressure reaction kettle and put it into a program-controlled blast drying oven. The heating rate is set at 2°C / min, heated to 180°C, and kept for 12 hours. The cooling rate per...

Embodiment 2

[0052] Embodiment 2 (comparative example)

[0053] The difference between embodiment 2 and embodiment 1 is: take the VCl of 3mmol 3 Dissolve in 25 mL of DMF, ie without graphene addition.

[0054] figure 1 It can be seen from the comparison of the XRD spectra in the figure that the derived V 2 o 5 The position of the diffraction peak can completely correspond to the orthorhombic vanadium pentoxide (PDF#77-2418), V 2 o 5 In addition to the diffraction peak of graphene at 2θ=26.5° in the @graphene composite material, other diffraction peak positions can also correspond to it, which proves the successful synthesis of the material.

[0055] figure 2 aDisplay V 2 o 5 It is a nanosheet structure with neat and uniform morphology, and the size of the nanosheet is 400-500nm; it can be seen from 2b that V 2 o 5 V in the @graphene complex 2 o 5 The nanosheets are evenly distributed on the two-dimensional graphene to form a two-dimensional hierarchical composite structure, wh...

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Abstract

The invention discloses a graphene-loaded vanadium pentoxide composite material, a preparation method thereof and application of the graphene-loaded vanadium pentoxide composite material in an aqueous zinc ion battery. The graphene-loaded vanadium pentoxide composite material is formed by in-situ growth of porous vanadium pentoxide nanosheets on the surface and between layers of layered graphene, the preparation method comprises the following steps: uniformly mixing a vanadium source, terephthalic acid and a graphene dispersion liquid, transferring into a high-pressure reaction kettle, and carrying out solvothermal reaction to obtain a V-MOF (at) graphene precursor; the V-MOF (at) graphene precursor is subjected to pyrolysis treatment to obtain the graphene-loaded vanadium pentoxide composite material with good conductivity, high structural stability and high electrochemical activity, the graphene-loaded vanadium pentoxide composite material is used as a positive electrode active material of the aqueous zinc ion battery, and the obtained aqueous zinc ion battery has excellent cycle performance and ultrahigh reversible specific capacity.

Description

technical field [0001] The invention relates to a positive electrode material of an aqueous zinc-ion battery, in particular to a graphene-loaded vanadium pentoxide composite material, and also relates to its preparation method and application in an aqueous zinc-ion battery, belonging to the technical field of new energy batteries. Background technique [0002] With the increasing demand for high-power equipment in human society, it is imminent to develop clean, advanced and renewable energy systems. Lithium-ion batteries occupy most of the secondary electronic device market due to their high energy density and long cycle life. However, safety hazards and high costs severely limit the application of lithium-ion batteries in large-scale energy storage systems. In recent years, low-cost, high-safety aqueous batteries have received extensive attention. Aqueous zinc-ion batteries rely on high safety, low cost, and high theoretical specific capacity (about 820mAh g -1 ) and suit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36B82Y30/00B82Y40/00C01B32/194C01G31/02H01M4/48H01M4/62
CPCH01M4/625H01M4/48H01M4/366C01G31/02C01B32/194B82Y40/00B82Y30/00C01P2004/80C01P2002/72C01P2004/03C01P2002/85Y02E60/10
Inventor 李芝华龚良俊
Owner CENT SOUTH UNIV
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