Preparation method and application of iron-zinc vanadate ion battery positive electrode material

A technology for zinc-ion batteries and positive electrode materials, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve problems such as poor cycle stability of zinc-ion batteries, and achieve excellent zinc-ion battery performance, high rate performance, and uniform size Effect

Active Publication Date: 2020-12-11
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the commercial V 2 o 5 The problem of poor cycle stability of zinc-like ion batteries provides a method for preparing iron-zinc vanadate ion battery cathode materials with uniform size, stable structure and good cycle performance

Method used

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  • Preparation method and application of iron-zinc vanadate ion battery positive electrode material
  • Preparation method and application of iron-zinc vanadate ion battery positive electrode material
  • Preparation method and application of iron-zinc vanadate ion battery positive electrode material

Examples

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Effect test

Embodiment 1

[0029] (1) Take 4mlH 2 o 2 Add to 40ml deionized water, weigh 2mmol of V 2 o 5 (0.364g) was added to the above solution, stirred in a water bath (300rpm) at 40°C until dissolved, and then weighed 0.2mmol of Fe(NO 3 ) 3 9H 2 Add O (0.0808g) to it, add 0.5g PVP after stirring for five minutes, and continue magnetic stirring for 30 minutes;

[0030] (2) Transfer the above mixed solution to a 50ml reaction kettle, and react at 180°C for 12h. After the reaction, the product was taken out and centrifuged and washed three times. The washing solvent was deionized water. The washed product was placed in a vacuum oven at 60°C for 12 hours to obtain the iron vanadate material; the SEM images of the iron vanadate material at different magnifications are as follows figure 1 Shown; The XRD pattern of this ferric vanadate material is as figure 2 show; combine figure 1 (a-b) It can be seen that the particle size of the iron vanadate material is 2 μm, which is determined by figure ...

Embodiment 2

[0035] (1) Take 1mlH 2 o 2 Add to 40ml deionized water, weigh 0.4mmol of NH 4 VO 3 Add to the above solution, stir in a water bath (300rpm) at 40°C until dissolved, then weigh 0.04mmol of FeCl 3 Add it, add 0.04g PVP after stirring for five minutes, and continue magnetic stirring for 30 minutes;

[0036] (2) Transfer the above mixed solution to a 50ml reactor and react at 100°C for 10h. After the reaction, the product was taken out and centrifuged and washed three times. The washing solvent was deionized water, and the washed product was placed in a vacuum oven at 60°C for 12 hours to obtain an iron vanadate material;

[0037] (3) Use the above-mentioned ferric vanadate material as the active material of the positive electrode material of zinc ion battery, grind it with carbon black and PVDF at a ratio of 8:1:1, add NMP as a solvent, grind it for 30 minutes, and use a scraper to scrape it on the Ti foil. Dry in a vacuum oven at 60°C;

[0038] (4) Use a punching machine t...

Embodiment 3

[0041] (1) Take 10mlH 2 o 2 Add to 40ml deionized water, weigh 4mmol of NH 4 VO 3 Add to the above solution, stir in a water bath (300rpm) at 40°C until dissolved, then weigh 0.4mmol of FeCl 3 Add it, add 0.6g DTAB after stirring for five minutes, and continue magnetic stirring for 30 minutes;

[0042](2) Transfer the above mixed solution to a 50ml reactor and react at 200°C for 30h. After the reaction, the product was taken out and centrifuged and washed three times. The washing solvent was deionized water, and the washed product was placed in a vacuum oven at 60°C for 12 hours to obtain an iron vanadate material;

[0043] (3) Use the above-mentioned ferric vanadate material as the active material of the positive electrode material of zinc ion battery, grind it with carbon black and PVDF at a ratio of 8:1:1, add NMP as a solvent, grind it for 30 minutes, and use a scraper to scrape it on the Ti foil. Dry in a vacuum oven at 60°C;

[0044] (4) Use a punching machine to p...

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Abstract

The invention relates to the technical field of zinc ion batteries, and provides a preparation method of an iron-zinc vanadate ion battery positive electrode material in order to solve the problem ofpoor cycle stability of commercial V2O5 zinc ion batteries. The method comprises the following steps of: adding a vanadium source, an iron source and a surfactant into a hydrogen peroxide solution, and uniformly mixing to obtain a reaction solution; and carrying out hydrothermal reaction on the reaction solution to obtain the ferric zinc vanadate ion battery positive electrode material. The prepared ferric vanadate material is uniform in size and stable in structure, has excellent zinc ion battery performance and can be used as a zinc ion battery positive electrode material. A prepared zinc ion battery has high rate capability, high specific capacity and excellent cycling stability, the specific capacity of the zinc ion battery reaches 220 mAh g<-1> under the test condition that the current density is 1 Ag<-1>, and the cycle time reaches 300 cycles.

Description

technical field [0001] The invention relates to the technical field of zinc ion batteries, in particular to a preparation method and application of an iron-zinc vanadate ion battery cathode material. Background technique [0002] With the increasing global demand for clean energy, the development of high-safety, low-cost, high-performance batteries has received extensive attention. Lithium-ion batteries are currently the main electrochemical energy storage devices, and have been widely used in portable electronic devices, new energy vehicles and other fields. However, lithium-ion batteries still have problems such as lack of lithium resources, high cost, and unsafe organic electrolytes. This limits its applications in high-safety, low-cost wearable electronics and large-scale energy storage. In recent years, aqueous Zn-ion battery has the advantages of abundant zinc resources, low cost, high safety of aqueous electrolyte and environmental friendliness, and is a very importa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00H01M4/58H01M10/36
CPCC01G49/00H01M4/5825H01M10/36H01M2004/021H01M2004/028C01P2004/03C01P2002/72C01P2006/40Y02E60/10
Inventor 曹澥宏高晓斌毋芳芳施文慧刘文贤王有为
Owner ZHEJIANG UNIV OF TECH
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