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Vanadium pentoxide positive electrode material as well as preparation method and application thereof

A technology of vanadium pentoxide and positive electrode materials, which is applied in the direction of positive electrodes, electrode manufacturing, battery electrodes, etc., can solve the problems of active material shedding, capacity drop, etc., and achieve less capacity fading, increased stability, and good ion transmission efficiency and the effect of conductivity

Active Publication Date: 2020-12-08
河北华普化工设备科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above composite method can improve V in a short time 2 o 5 However, as the cycle time increases, this simple composite method still faces the situation that some active materials fall off from the carbon substrate, resulting in a sudden drop in capacity.

Method used

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  • Vanadium pentoxide positive electrode material as well as preparation method and application thereof
  • Vanadium pentoxide positive electrode material as well as preparation method and application thereof
  • Vanadium pentoxide positive electrode material as well as preparation method and application thereof

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preparation example Construction

[0035] An embodiment of the present invention provides a method for preparing a vanadium pentoxide positive electrode material, comprising the following steps:

[0036] S1: Add vanadium source and sulfur source to alcohol solvent, heat pretreatment, react, centrifuge, wash and dry to get sea urchin-like VS 4 Precursor;

[0037] S2: Put the VS 4 The precursor is sintered to obtain V with a multidimensional hybrid structure 2 o 5 Powder, wherein the multidimensional hybrid structure includes a three-dimensional sea urchin-like structure and a two-dimensional nanosheet structure;

[0038] S3: Set the V 2 o 5 The powder and polypyrrole are dispersed in ethanol, and a block copolymer surfactant is added to obtain a suspension, which is electrospun to obtain V 2 o 5 / polypyrrole fiber, the resulting fiber is calcined under an inert atmosphere to obtain a vanadium pentoxide positive electrode material V 2 o 5 @PPy.

Embodiment 1

[0041] A preparation method of vanadium pentoxide cathode material, comprising the steps of:

[0042] S1: Add ammonium metavanadate and thiourea with a mass ratio of 1:5 to 20 times (mass volume times) methanol, add surfactant P123 (the amount added is the total mass of ammonium metavanadate, thiourea and methanol 3%), carry out preliminary dissolving and mixing, stir and pretreat at 65°C for 30min, the mixed solution turns from light yellow to gray black, then put the pretreated mixed solution into the reaction kettle and react at 155°C for 14h, then centrifuge , and washed with deionized water and ethanol, and the resulting precipitate was dried at 70°C for 12 hours to obtain gray-black sea urchin VS 4 Precursor;

[0043] S2: Apply the above VS 4 The precursor was placed in a box-type sintering furnace and sintered at 200 °C for 2 hours to obtain V with a dual morphology of a three-dimensional nanoflower structure and a two-dimensional nanosheet structure 2 o 5 powder; ...

Embodiment 2

[0046] A preparation method of vanadium pentoxide cathode material, comprising the steps of:

[0047] S1: Add ammonium metavanadate and thioacetamide with a mass ratio of 1:4 to 20 times (mass and volume times) methanol, and add surfactant P123 (addition amount is ammonium metavanadate, thioacetamide 2% of the total mass of methanol) for preliminary dissolution and mixing, stirring and pretreatment at 40°C for 60 minutes, the mixed solution turns from light yellow to gray black, and then put the pretreated mixed solution into the reaction kettle to react at 140°C After 16 hours, centrifuge, wash with deionized water and ethanol, and dry the resulting precipitate at 70°C for 12 hours to obtain gray-black sea urchin VS 4 Precursor;

[0048] S2: Apply the above VS 4 The precursor was placed in a box-type sintering furnace and sintered at 400 °C for 3 hours to obtain V with a dual morphology of a three-dimensional nanoflower structure and a two-dimensional nanosheet structure 2...

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Abstract

The invention relates to the technical field of sodium ion batteries, and particularly discloses a vanadium pentoxide positive electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: adding a vanadium source and a sulfur source into an alcohol solvent, and reacting to obtain a sea urchin-shaped VS4 precursor; sintering the VS4 precursor to obtain V2O5 powder with a multi-dimensional mixed structure; dispersing the V2O5 powder and polypyrrole in ethanol, adding a block copolymer surfactant to obtain a suspension, performing electrostatic spinning to obtain V2O5 / polypyrrole fibers, and calcining the obtained fibers in an inert atmosphere to obtain the vanadium pentoxide positive electrode material. The vanadium pentoxide positive electrode material provided by the invention is of a fiber net structure, the active material V2O5 powder simultaneously contains double morphologies of a two-dimensional structure and a three-dimensional structure, the surface of the active material V2O5 powder is coated with polypyrrole, and the vanadium pentoxide positive electrode material is high in ion transmission efficiency, good in conductivity and stability, higher in specific capacity, less in capacity attenuation and good in cycle performance.

Description

technical field [0001] The invention relates to the technical field of sodium ion batteries, in particular to a vanadium pentoxide cathode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are secondary batteries that have been widely used in portable electronics, hybrid electric vehicles, and smart grids. However, the large-scale application of lithium-ion batteries has been severely hindered by the low global reserves and high price of lithium. In recent years, researchers have found that sodium-ion batteries have become important candidates for next-generation secondary batteries due to their abundant reserves. Cathode materials have a high cost ratio in sodium-ion batteries and have a capacity disadvantage compared to anode materials, making their research value more prominent. However, the small discharge specific capacity and poor cycle life severely limit the development progress of cathode materials for s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/131H01M4/1391H01M4/48H01M4/02
CPCH01M4/0471H01M4/131H01M4/1391H01M4/483H01M2004/028Y02E60/10
Inventor 王波张迪王伟李冲王秋君李文李昭进孙会兰
Owner 河北华普化工设备科技有限公司
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