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vc for negative electrode of sodium ion battery 0.75 @npc Composite materials, preparation and application

A technology for sodium ion batteries and composite materials is applied in the field of preparation of negative electrode materials for sodium ion batteries, and achieves the effects of strong operability, broad industrial application prospects and environmental friendliness.

Active Publication Date: 2021-02-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing negative electrode materials for sodium ion batteries cannot effectively improve the cycle stability of the materials under the premise of ensuring good specific capacity, and provide VC for negative electrodes of sodium ion batteries. 0.75 @NPC composite materials, preparation and application

Method used

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  • vc for negative electrode of sodium ion battery <sub>0.75</sub> @npc Composite materials, preparation and application
  • vc for negative electrode of sodium ion battery <sub>0.75</sub> @npc Composite materials, preparation and application
  • vc for negative electrode of sodium ion battery <sub>0.75</sub> @npc Composite materials, preparation and application

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specific Embodiment approach 1

[0032] Specific implementation mode 1: VC used for the negative electrode of sodium ion battery in this implementation mode 0.75 The @NPC composite material includes vanadium carbide nanoparticles and nitrogen-phosphorus-doped carbon nanosheets, and the nitrogen-phosphorus-doped carbon nanosheets are coated on the outer surface of the vanadium carbide nanoparticles; the diameter of the vanadium carbide nanoparticles is 6 ~10nm, the thickness of the carbon nanosheets doped with nitrogen and phosphorus is 20~30nm; the mass ratio of the vanadium carbide nanoparticles to the carbon nanosheets doped with nitrogen and phosphorus is 1:(0.2~0.3), the The doping amount of nitrogen in the nitrogen-phosphorus-doped carbon nanosheets is 2-3wt%, and the doping amount of phosphorus in the nitrogen-phosphorus-doped carbon nanosheets is 3.5-4.5wt%; VC 0.75 The specific surface area of ​​@NPC composite material is 220~230m / g 2 .

[0033] In this embodiment, the role played by vanadium carbi...

specific Embodiment approach 2

[0034] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the mass ratio of the vanadium carbide nanoparticles to the carbon nanosheets doped with nitrogen and phosphorus is 79:21, and the carbon nanosheets doped with nitrogen and phosphorus The doping amount of nitrogen in the sheet is 2.7wt%, the doping amount of phosphorus in the carbon nanosheet doped with nitrogen and phosphorus is 4.1wt%, and the negative electrode of the sodium ion battery uses VC 0.75 The specific surface area of ​​@NPC composite is 225.29m / g 2 . Others are different from the first embodiment.

specific Embodiment approach 3

[0035] Specific implementation mode three: VC used for the negative electrode of the sodium ion battery in this implementation mode 0.75 The preparation method of @NPC composite material is carried out according to the following steps:

[0036]1. Ultrasonic disperse melamine into solvent A to obtain a dispersion; the concentration of the dispersion is 15 to 20 g / mL;

[0037] 2. Add dilute nitric acid, dilute sulfuric acid or phosphoric acid into the dispersion to obtain precipitation;

[0038] 3. Suction filter the precipitate and wash it with absolute ethanol for 3 to 5 times, and dry it at a temperature of 60 to 80°C for 8 to 12 hours to obtain the precursor A;

[0039] 4. Disperse ammonium metavanadate, diammonium hydrogen phosphate and citric acid in solvent B, and stir at a temperature of 70 to 90°C until a gel is formed; the quality of the ammonium metavanadate is the same as that of solvent B The volume ratio is 1g:(45~55)mL; the volume ratio of the quality of the dia...

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Abstract

The invention discloses a VC0.75@NPC composite material used for a sodium-ion battery cathode, and preparation and application thereof, belongs to the field of sodium-ion battery cathode material preparation, and particularly relates to the VC0.75@NPC composite material used for the sodium-ion battery cathode, and the preparation and the application thereof. The invention aims to solve the problems that a traditional cathode material used for the sodium-ion battery can not effectively improve the cycling stability of the material on a premise that a good specific capacity is guaranteed. The method comprises the following steps: 1) preparing melamine dispersion liquid; 2) adding complex acid into the dispersion liquid to obtain sediments; 3) cleaning and drying the sediments to obtain a precursor A; 4) preparing gel which contains a vanadium source and a phosphorus source; 5) mixing the precursor A with the gel, and drying to obtain a precursor B; 6) raising the temperature and keepingthe temperature of the precursor B under a condition of argon or nitrogen to obtain black powder; 7) after the black powder is cleaned and dried, obtaining the VC0.75@NPC composite material. The composite material serves as the sodium-ion battery cathode material.

Description

technical field [0001] The invention belongs to the field of preparation of negative electrode materials for sodium ion batteries, in particular to VC for negative electrodes of sodium ion batteries. 0.75 @NPC Materials, Preparation and Applications. Background technique [0002] Lithium-ion batteries have become one of the most promising candidates for large-scale energy storage and consumer electronics applications due to their high energy density, long life, and environmental friendliness, and have achieved great success in the past few decades. However, due to the limited lithium resources in the earth's crust, it is very difficult to meet the growing demand for lithium-ion batteries. Therefore, it is critical to develop alternative battery systems based on earth-abundant elements. Recently, due to the absolute advantages of Na-ion batteries in terms of low cost and abundance of Na resources, Na-ion batteries have received more and more attention and are considered to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/054C01B32/158
CPCC01B32/158H01M4/366H01M4/583H01M4/625H01M10/054Y02E60/10
Inventor 宋波吴青姚泰韩杰才张宇民
Owner HARBIN INST OF TECH