A kind of vanadium-based material and its preparation method and application

A vanadium-based, positive electrode material technology, applied in nanotechnology, chemical instruments and methods, vanadium compounds, etc. for materials and surface science, can solve the problems of easy structure collapse and low cycle stability, and achieve improved capacity performance, Effect of Structural Stability Enhancement

Active Publication Date: 2022-03-25
CHENGDU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But V 2 o 5 In the process of charge and discharge, the structure is easy to collapse, resulting in low cycle stability. It is necessary to find other more stable materials as the positive electrode of zinc-ion batteries.

Method used

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  • A kind of vanadium-based material and its preparation method and application
  • A kind of vanadium-based material and its preparation method and application
  • A kind of vanadium-based material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This example provides a vanadium-based material V 1.11 S 2 The preparation method comprises the following steps:

[0041] Step (1): 2 mmol ammonium metavanadate (NH 4 VO 3 ) and 10 mmol L-cysteine ​​(L-cysteine) were added to 24 mL N-methylpyrrolidone (NMP), heated and stirred at 120 °C for 8 hours to obtain a mixture; then the mixture was transferred to a 50 mL poly In a tetrafluoroethylene-lined high-pressure reactor, react at 200 °C for 8 hours. After the reactor is cooled, take out the sample, and then wash it with deionized water and absolute ethanol three times respectively; put the cleaned sample into a vacuum Dry overnight in the oven to obtain the vanadium-sulfur intermediate compound;

[0042] Step (2): Put the vanadium-sulfur intermediate compound obtained in step (1) into a ceramic crucible under the protective atmosphere of argon gas, and calcinate it at 400 °C for 2 hours, and obtain a black sample after natural cooling, which is V 1.11 S 2 .

Embodiment 2

[0044] This example provides a vanadium-based material V 1.11 S 2 The difference between the preparation method and Example 1 is that ammonium metavanadate is adjusted to potassium metavanadate, and L-cysteine ​​is adjusted to homocysteine; the remaining steps and parameters are the same.

Embodiment 3

[0046] This example provides a vanadium-based material V 1.11 S 2 The difference between the preparation method and Example 1 is that the amount of L-cysteine ​​in step (1) is adjusted to 14 mmol, and the calcination temperature in step (2) is adjusted to 420 °C; the rest of the steps and parameters are the same .

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Abstract

The invention discloses a vanadium-based material and its preparation method and application, belonging to the technical field of electrode materials and secondary batteries. The chemical formula of the vanadium-based material is V1.11S2, and has the following characteristics and advantages: 1) It has a special nano The structure is nano-flower-like, which allows a large amount of zinc ions to be embedded or extracted inside the material, thereby improving the capacity performance of the battery; 2) After calcination, the structural stability of the V1.11S2 material is strengthened, and the V1.11S2 material is continuously charged and discharged. , to keep the capacity from fading; 3) The vanadium-sulfur bond is special and the material has strong plasticity; during the initial charge and discharge, due to the continuous activation of the material and the change of structural adaptability, the charge and discharge capacity will continue to increase. When stable, the capacity will stabilize. The nano-flower V1.11S2 of the present invention can be used as the positive electrode material of the aqueous zinc-ion battery and has excellent battery performance.

Description

technical field [0001] The invention relates to the technical field of electrode materials and secondary batteries, in particular to a vanadium-based material and its preparation method and application. Background technique [0002] The new energy industry led by the energy crisis and environmental pollution is constantly developing, and the research on energy storage technology has been paid more and more attention in recent decades. Energy storage technology refers to the storage of electrical energy. Common energy storage devices include batteries, capacitors, inductors, etc. Among them, battery energy storage technology is one of the earliest, most popular and most mature energy storage methods. There are many types of batteries, including lithium-ion batteries, lead-acid batteries, nickel-metal hydride batteries, and fuel cells. This type of battery is a secondary battery, which can be charged and discharged repeatedly, which greatly improves the utilization rate of ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/38C01G31/00B82Y30/00B82Y40/00
CPCH01M4/5815H01M10/38B82Y30/00B82Y40/00C01G31/00H01M2004/028C01P2004/03C01P2002/72C01P2004/04C01P2004/50Y02E60/10Y02P70/50
Inventor 姚卫棠陈祥杰吴小强孔清泉安旭光张靖
Owner CHENGDU UNIV
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