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Preparation method of carbon-coated ferroferric oxide nanometer core-shell microspheres for lithium battery

A carbon coating technology of ferric oxide and ferric tetroxide, applied in the field of electrochemical materials, can solve problems such as electrochemical performance attenuation, volume change, etc., to prevent unfavorable oxidation, uniform particle size distribution, and improve material conductivity Effect

Inactive Publication Date: 2018-01-19
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of electrochemical performance attenuation caused by the volume change during the charging and discharging process of the lithium ion battery negative electrode material, and propose a preparation of a carbon-coated precursor-coated ferric oxide nano-core-shell microsphere method, used as lithium-ion battery negative electrode material

Method used

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  • Preparation method of carbon-coated ferroferric oxide nanometer core-shell microspheres for lithium battery
  • Preparation method of carbon-coated ferroferric oxide nanometer core-shell microspheres for lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Weigh ferric chloride hexahydrate (FeCl 3 ·6H 2 (O) 4.8g as iron source, join in 60mL ethylene glycol (EG), carry out ultrasonic dispersion 20min; Then, weigh 9.6g of anhydrous sodium acetate, wherein 3 ·6H 2 O) the ratio with anhydrous sodium acetate is 1: 2, joins above-mentioned solution, magnetically stirs 30min; The above-mentioned solution is transferred in the reactor of polytetrafluoroethylene liner, reacts 24h at 180 ℃; Treat that reaction finishes, After naturally cooling to room temperature, the reaction product was washed by centrifugation with distilled water and absolute ethanol in sequence; and then dried in vacuum at 60°C for 12 hours to obtain nano-ferric oxide, and its scanning electron microscope picture is as follows figure 1 shown.

[0032] Weigh 0.025g of phenolic resin as a carbon source, add a little absolute ethanol dropwise, and dissolve by ultrasonic or stirring; 3 o 4 5% of the mass, continue to ultrasonically disperse for 20 minutes; af...

Embodiment 2

[0035] Weigh ferric chloride hexahydrate (FeCl 3 ·6H 2 (O) 4.8g as iron source, join in 80mL ethylene glycol (EG), carry out ultrasonic dispersion 20min; Then, take by weighing 4.8g of anhydrous sodium acetate, wherein 3 ·6H 2 O) the ratio with anhydrous sodium acetate is 1: 1, joins above-mentioned solution, magnetically stirs 30min; The above-mentioned solution is transferred in the reactor of polytetrafluoroethylene liner, reacts 16h at 200 ℃; Treat that reaction finishes, After naturally cooling to room temperature, the reaction liquid was successively washed by centrifugation with distilled water and absolute ethanol; and then dried in vacuum at 60° C. for 12 hours to obtain nanometer ferric oxide.

[0036] Weigh 0.05g of epoxy resin as a carbon source, add a little toluene dropwise, and dissolve by ultrasonic or stirring; 3 o 4 10% of the mass, continue to ultrasonically disperse for 20 minutes; after that, pour the mixture into an agate mortar, use toluene as solven...

Embodiment 3

[0039] Weigh ferric chloride hexahydrate (FeCl 3 ·6H 2 (O) 4.8g is used as iron source, join in 100mL ethylene glycol (EG), carry out ultrasonic dispersion 20min; 3 ·6H 2O) and the ratio of anhydrous sodium acetate is 2: 1, joins above-mentioned solution, magnetically stirs 30min; The above-mentioned solution is transferred in the reactor of polytetrafluoroethylene lining, reacts 12h at 220 ℃; Treat that reaction finishes, After naturally cooling to room temperature, the reaction solution was successively washed by centrifugation with distilled water and absolute ethanol, and then dried in vacuum at 60° C. for 12 hours to obtain nanometer ferric oxide.

[0040] Weigh 0.1g of Copna resin as a carbon source, add a little tetrahydrofuran dropwise, and dissolve by ultrasonication or stirring; 3 o 4 20% of the mass, continue to ultrasonically disperse for 20 minutes; after that, pour the mixture into an agate mortar, use tetrahydrofuran as a solvent, add a little to grind until...

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Abstract

The invention discloses a preparation method of carbon-coated ferroferric oxide nanometer core-shell microspheres for a lithium battery. The method comprises the following steps: preparing nanometer ferroferric oxide microspheres with uniform particle size distribution with a simple solvothermal method, wherein the nanometer ferroferric oxide microspheres are taken as a core source, and meanwhileresin is taken as a carbon source; coating the core source and the carbon source with carbon in a grinding way; and carrying out the processes of curing, carbonization and the like to prepare the carbon-coated ferroferric oxide nanometer core-shell microspheres. The microspheres are applied to a negative electrode material of the lithium battery as an electrode material. The method has the advantages of simple process, adoption of cheap and readily-available raw materials and easiness in realization of industrial production.

Description

technical field [0001] The invention belongs to the technical field of electrochemical materials, and in particular relates to a method for preparing a carbon-coated ferric oxide nanometer core-shell microsphere negative electrode material for a lithium battery. Background technique [0002] Lithium-ion batteries have higher energy density and power density than nickel-metal hydride, nickel-cadmium, and lead-acid batteries. They also have the advantages of long cycle life, low self-discharge rate, and no memory effect. Therefore, lithium batteries have become one of the focuses of research on new chemical power sources. Studies have found that the structure and morphology of lithium-ion battery anode materials play a key role in electrochemical performance. Therefore, the research on anode materials has always been a hot spot and difficulty in lithium-ion batteries. [0003] Transition metal oxides are a type of lithium-ion negative electrode materials, which have a high ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/62H01M10/0525C01G49/08
CPCY02E60/10
Inventor 史景利李晓杰王亚丽徐建康曹二闯李正一马昌
Owner TIANJIN POLYTECHNIC UNIV
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