Method for producing carbon composite amorphous vanadium oxide powder

An amorphous, vanadium oxide technology, applied in electrochemical generators, electrical components, battery electrodes, etc., can solve the problems of limited application, high resistance, poor conductivity, etc., to achieve high capacity, low energy consumption, and prevent agglomeration.

Active Publication Date: 2016-11-23
UNIV OF SCI & TECH BEIJING
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Although the capacity of crystalline vanadium oxide is high, it can provide a large number of lattices to store lithium ions, but after storage, its lattice is easily converted into a stable phase, so lithium ions are fixed in the lattice, which is irreversible.
In addition, vanadium oxide has poor electrical conductivity and high resistance
Both of these aspects limit its application in lithium batteries

Method used

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  • Method for producing carbon composite amorphous vanadium oxide powder
  • Method for producing carbon composite amorphous vanadium oxide powder
  • Method for producing carbon composite amorphous vanadium oxide powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 0.1 mol of ammonium metavanadate, 0.8 mol of ammonium nitrate, 0.3 mol of citric acid, 0.08 mol of glycine, and 0.02 mol of glucose to prepare a solution, and uniformly mix vanadate ions and carbon source molecules in the solution. The solution was placed on a furnace and heated under air. After the solution is boiled and evaporated to form a gel, a combustion synthesis reaction occurs, and finally carbon-composite amorphous vanadium oxide powder is obtained.

Embodiment 2

[0025] Weigh 0.1 mol of ammonium metavanadate, 0.8 mol of ammonium nitrate, 0.3 mol of citric acid, 0.08 mol of glycine, and 0.03 mol of glucose to prepare a solution, place the solution on a heating furnace, and heat it under air. After the solution is boiled and evaporated to form a gel, a combustion synthesis reaction occurs to obtain carbon-composite amorphous vanadium oxide powder.

Embodiment 3

[0027] Weigh 0.06 moles of ammonium metavanadate, 0.8 moles of ammonium nitrate, 0.3 moles of citric acid, 0.08 moles of glycine, and 0.01 moles of glucose to prepare a solution, place the solution on a heating furnace, and heat it under air. After the solution is boiled and evaporated to form a gel, a combustion synthesis reaction occurs to obtain carbon-composite amorphous vanadium oxide powder.

[0028] test results

[0029] The carbon-composite amorphous vanadium oxide material obtained in the above three examples is used as the active material, and conductive carbon black (Super P) and polyvinylidene fluoride (PVDF) are used to make the negative electrode of the lithium battery according to the mass ratio of 60:30:10 Material. Disperse the mixture into NMP solution to make a slurry, then apply the slurry evenly on the copper foil with a blade, dry it in a vacuum oven at 120°C for 12 hours, and then dry it at 200kg m -2 pressed into discs under high pressure. The electr...

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Abstract

The method relates to a method for producing carbon composite amorphous vanadium oxide powder, and belongs to the field of new energy resources. A process comprises the following steps: preparing a solution from raw materials, namely, a vanadium source, a fuel, an auxiliary and a carbon source, according to a certain proportion; heating the solution in a certain atmosphere, and performing combustion synthesis reaction after the solution is volatilized and concentrated to form gel; self-maintaining the reaction to finally obtain the carbon composite amorphous vanadium oxide powder by virtue of heat released by combustion reaction. A large amount of gas is generated in a reaction process, so that not only can a powder product be effectively prevented from being agglomerated, but also a mesoporous structure can be formed. A liquid phase mixing manner is adopted, so that amorphous vanadium oxide granules with small granularities can be closely combined and uniformly dispersed with carbon. The raw materials are readily available, the method is simple, low in cost and high in industrialization rate, and the prepared carbon composite amorphous vanadium oxide powder has high capacity and high cyclic stability when being used as an anode material for a lithium battery.

Description

technical field [0001] The invention belongs to the field of new energy, and relates to a method for one-step synthesis of a carbon-composite amorphous vanadium oxide material used as a negative electrode of a lithium battery. Background technique [0002] New energy and renewable energy technology is one of the most important high-tech industries in the 21st century, and the development direction of electrochemical energy storage system is large capacity, high power and long life. Lithium-ion batteries are widely used in mobile phones, cameras, notebook computers, electric vehicles and other fields due to their light weight, high energy density, no memory effect, and long life. At present, the commercial lithium-ion battery anode materials are mainly carbon-based anode materials, and its theoretical capacity is only 372mAh / g, which cannot meet the current miniaturization development of portable electronic devices and the extensive demand for large-capacity and high-power ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/587H01M10/0525
CPCH01M4/364H01M4/483H01M4/587H01M10/0525Y02E60/10
Inventor 秦明礼吴昊阳贾宝瑞李小丽曹知勤曲选辉
Owner UNIV OF SCI & TECH BEIJING
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