Sodium vanadium phosphate sodium ion battery positive electrode material and preparation method therefor

A sodium vanadium phosphate, ion battery technology, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve the problems of difficult to achieve theoretical capacity, poor electronic conductivity of phosphate, etc. The effect of improving electronic conductivity and excellent electrochemical performance

Inactive Publication Date: 2016-05-04
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, phosphates have poor electronic conductivity, so it is difficult to reach the theoretical capacity of this material during charge and discharge.

Method used

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  • Sodium vanadium phosphate sodium ion battery positive electrode material and preparation method therefor
  • Sodium vanadium phosphate sodium ion battery positive electrode material and preparation method therefor
  • Sodium vanadium phosphate sodium ion battery positive electrode material and preparation method therefor

Examples

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Effect test

example 1

[0061] S1: Dissolve 0.5g of agarose in a flask filled with 50ml of boiling water, place the entire flask in a water bath environment and keep warm for 10min, the temperature of the water bath is 90°C, and stir at 440r / min throughout the process to make the agarose solution uniform;

[0062] S2: Add sodium acetate, ammonium dihydrogen phosphate and vanadium acetylacetonate in sequence to the agarose solution in step S1, the masses of sodium acetate, ammonium dihydrogen phosphate and vanadium acetylacetonate are 1.987g, 2.786g and 5.625g respectively , and close the mouth of the flask, and place it in a water bath environment to keep warm for 10 hours. The temperature of the water bath is 90°C, and the whole process is stirred at 440r / min.

[0063] The stoichiometric ratio of the sodium acetate, ammonium dihydrogen phosphate and vanadium acetylacetonate satisfies the following relationship: the molar ratio of Na:V:P is 3:2:3, and only when such a stoichiometric ratio relationship...

Embodiment 2

[0070] S1: Dissolve 0.5 g of agarose in a flask filled with 50 ml of boiling water, place the flask as a whole in a water bath for 20 minutes, the temperature of the water bath is 100°C, and stir at 440 r / min throughout the process to make the agarose solution uniform;

[0071] S2: Add sodium acetate, ammonium dihydrogen phosphate and vanadium acetylacetonate in sequence to the agarose solution in step S1, the masses of sodium acetate, ammonium dihydrogen phosphate and vanadium acetylacetonate are 1.987g, 2.786g and 5.625g respectively , and close the mouth of the flask, and place it in a water bath environment for insulation for 20 hours. The temperature of the water bath is 100°C, and the whole process is stirred at 440r / min.

[0072] The stoichiometric ratio of the sodium acetate, ammonium dihydrogen phosphate and vanadium acetylacetonate satisfies the following relationship: the molar ratio of Na:V:P is 3:2:3, and only when such a stoichiometric ratio relationship is satisf...

example 3

[0079] S1: Dissolve 0.5 g of agarose in a flask filled with 50 ml of boiling water, place the entire flask in a water bath environment and keep warm for 30 minutes, the temperature of the water bath is 95°C, and stir at 440 r / min throughout the process to make the agarose solution uniform;

[0080] S2: Add sodium acetate, ammonium dihydrogen phosphate and vanadium acetylacetonate in sequence to the agarose solution in step S1, the masses of sodium acetate, ammonium dihydrogen phosphate and vanadium acetylacetonate are 1.987g, 2.786g and 5.625g respectively , and close the mouth of the flask, and place it in a water bath environment to keep warm for 14 hours. The temperature of the water bath is 95°C, and the whole process is stirred at 440r / min.

[0081] The stoichiometric ratio of the sodium acetate, ammonium dihydrogen phosphate and vanadium acetylacetonate satisfies the following relationship: the molar ratio of Na:V:P is 3:2:3, and only when such a stoichiometric ratio rela...

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Abstract

The invention discloses a sodium vanadium phosphate sodium ion battery positive electrode material and a preparation method therefor, and belongs to the fields of an energy storage material and technology. The positive electrode material comprises a three-dimensional carbon framework and Na3V2(PO4)3 composite granules; the Na3V2(PO4)3 composite granules adopt core-shell structures, wherein Na3V2(PO4)3 is taken as the core part while a carton layer is adopted as the shell part; the thickness of the carbon layer is 1-4nm; the grain diameter of the Na3V2(PO4)3 composite granules is 20-200nm; and the Na3V2(PO4)3 composite granules are positioned in the gaps of the three-dimensional carbon framework. The invention also discloses a method for preparing the sodium vanadium phosphate sodium ion battery positive electrode material by adopting a sol-gel method and a ball-milling method. The preparation method is simple in process; and the finally-synthesized positive electrode material has the characteristics of large specific surface area, small grain diameter dimension and uniform carbon layer coating, so that the positive electrode material is excellent in the electrochemical performance.

Description

technical field [0001] The invention belongs to the field of energy storage materials and technologies, and more specifically relates to a vanadium sodium sodium ion battery positive electrode material and a preparation method thereof. Background technique [0002] Nowadays, the generation and storage of energy has become an important topic in human's daily life. Among many energy storage technologies, battery is a very important and promising energy storage technology. In portable mobile products, lithium-ion batteries (LIBs) occupy a dominant position among rechargeable batteries due to their high energy density, high potential, and environmental friendliness. With the development of large-scale power storage technology, low-cost sodium-ion batteries (SIBs) are more suitable as energy storage technologies in large-scale power grids because sodium is more abundant than lithium resources. [0003] Sodium-ion room temperature batteries have now been widely concerned by rese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/5825H01M4/625H01M10/054Y02E60/10
Inventor 王玮冯平源蒋凯章庆王玉娇王康丽程时杰
Owner HUAZHONG UNIV OF SCI & TECH
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