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Carbon-coated vanadium titanium manganese sodium phosphate microspheres as well as preparation method and application thereof

A technology of carbon-coated vanadium titanium manganese sodium phosphate and microspheres, applied in the fields of nanomaterials and electrochemistry, can solve the problems of insufficient specific capacity, poor rate performance, low discharge platform, etc., and achieves simple preparation method, high discharge Pressure and reversible specific capacity, low cost effect

Pending Publication Date: 2021-12-07
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention aims to propose a carbon-coated vanadium-titanium-manganese sodium microsphere and its preparation method and application to solve the problem that the current NASICON type sodium-ion battery positive electrode material has a low discharge platform, the specific capacity is not high enough, and the rate Problems such as poor performance and rapid capacity fading

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  • Carbon-coated vanadium titanium manganese sodium phosphate microspheres as well as preparation method and application thereof
  • Carbon-coated vanadium titanium manganese sodium phosphate microspheres as well as preparation method and application thereof
  • Carbon-coated vanadium titanium manganese sodium phosphate microspheres as well as preparation method and application thereof

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preparation example Construction

[0032] In order to solve the above problems, an embodiment of the present invention provides a method for preparing carbon-coated vanadium titanium manganese sodium phosphate microspheres, comprising the following steps:

[0033] S1. Add carbon source, vanadium source, manganese source, sodium source, sodium dihydrogen phosphate and di(2-hydroxypropionic acid) diammonium dihydroxide titanium into deionized water, stir and dissolve, then spray dry to obtain the precursor ;

[0034] S2. Calcining the precursor under preset conditions to obtain carbon-coated vanadium-titanium-manganese-sodium microspheres.

[0035] Specifically, in step S1, the carbon source includes one of citric acid, acetic acid, glucose, sucrose powder, and polyvinylpyrrolidone, the vanadium source includes one of ammonium metavanadate, vanadium acetylacetonate, and vanadyl acetylacetonate, and manganese The source includes one of manganese acetate, manganese nitrate and manganese acetylacetonate, and the so...

Embodiment 1

[0048] This embodiment provides a method for preparing carbon-coated vanadium-titanium-manganese sodium microspheres, comprising the following steps:

[0049] 1) Add 10mmol citric acid powder, 5mmol manganese acetate powder, 15mmol sodium dihydrogen phosphate powder, 1mmol ammonium metavanadate, 1mmol sodium acetate, 4mmol di(2-hydroxypropionic acid) diammonium titanium hydroxide to 100mL in sequence Stir in deionized water for 30 minutes at room temperature to dissolve to obtain a mixed solution; then spray dry the mixed solution, wherein the spray drying temperature is 160°C, the circulating air flow is 90%, and the sampling pump is 5%, to obtain the precursor;

[0050] 2) Put the prepared precursor into a tube furnace for calcination at 650°C for 6 hours, the calcination atmosphere is argon, and the heating rate is 3°C min -1 , the final calcined product is carbon-coated vanadium-titanium-manganese sodium microspheres Na 3.2 MnTi 0.8 V 0.2 (PO 4 ) 3 / C (650°C).

[005...

Embodiment 2

[0069] This embodiment provides the preparation method of carbon-coated vanadium titanium manganese sodium microspheres, the difference between this embodiment and embodiment 1 is:

[0070] In step 1), 10mmol citric acid powder, 5mmol manganese acetate powder, 15mmol sodium dihydrogen phosphate powder, 1mmol ammonium metavanadate, 1mmol sodium acetate, 4mmol di(2-hydroxypropionic acid) diammonium hydroxide titanium successively Add to 100mL deionized water;

[0071] Other steps and parameter are identical with embodiment 1, and final product is carbon-coated vanadium titanium manganese sodium micron spheres Na 3.3 MnTi 0.7 V 0.3 (PO 4 ) 3 / C (650°C).

[0072] Comparative example 1 of embodiment 2

[0073] The raw material in step 1) is not added ammonium metavanadate and sodium acetate, adds 5mmol two (2-hydroxypropionic acid) diammonium dihydroxide titanium, other steps and parameter are constant, obtain Na 3 MnTi(PO 4 ) 3 / C (650°C) micron balls.

[0074] Comparati...

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Abstract

The invention provides carbon-coated vanadium titanium manganese sodium phosphate microspheres and a preparation method and application thereof. The preparation method comprises the steps that: a carbon source, a vanadium source, a manganese source, a sodium source, sodium dihydrogen phosphate and bis (2-hydracrylic acid) titanium diammonium hydroxide are added into deionized water, spray drying is conducted after stirring and dissolving are conducted, and a precursor is obtained; and the precursor is calcined under a preset condition to obtain the carbon-coated vanadium titanium manganese sodium phosphate microspheres. The carbon-coated vanadium titanium manganese sodium phosphate microspheres are prepared by adopting a spray drying technology, the preparation method is simple, and the product is high in yield, environment-friendly and low in cost; and the prepared microspheres can be used as a sodium-ion battery positive electrode material to realize multi-electron electrochemical reaction, show high discharge medium voltage and reversible specific capacity, and have obvious advantages in energy density, cycling stability and rate capability.

Description

technical field [0001] The invention relates to the field of nanomaterials and electrochemical technology, in particular to a carbon-coated vanadium-titanium-manganese sodium microsphere and its preparation method and application. Background technique [0002] As one of the most important representatives of clean energy, lithium-ion batteries have the characteristics of high energy density, long cycle life, simplicity and portability, and have become the first choice for power storage systems in the past 30 years. However, the shortage of lithium resources and high cost greatly limit its application in the field of large-scale energy storage, so it is imminent to develop new low-cost and high-efficiency energy storage batteries. Sodium and lithium belong to the same main group, and both have similar chemical characteristics. At the same time, sodium resources are high in abundance, wide in distribution, and low in raw material cost. Therefore, sodium-ion batteries are consi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/054
CPCH01M4/5825H01M4/625H01M10/054H01M2004/028Y02E60/10
Inventor 麦立强朱婷胡平周亮
Owner WUHAN UNIV OF TECH