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Method for extremely fast preparing ferroferric oxide/graphene lithium ion battery composite negative electrode material

A technology for ferric oxide and lithium-ion batteries, which is applied in battery electrodes, secondary batteries, circuits, etc., and can solve the problems of the electrochemical performance of ferric oxide-based composite materials that need to be improved, difficult industrial preparation and application, and complicated process flow and other issues to achieve the effect of ensuring long-term cycle stability, excellent cycle stability performance, and high reversible specific capacity

Inactive Publication Date: 2017-11-21
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the composite methods of Fe3O4 and nano-carbon materials mainly include high-temperature composite, high-temperature calcination, hydrothermal deposition, etc., involving multiple steps and complex operation processes, complicated process flow, and inevitably increasing manufacturing costs. , it is difficult to achieve large-scale industrial preparation and application
In addition, the electrochemical performance of Fe3O4-based composites still needs to be improved

Method used

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  • Method for extremely fast preparing ferroferric oxide/graphene lithium ion battery composite negative electrode material
  • Method for extremely fast preparing ferroferric oxide/graphene lithium ion battery composite negative electrode material
  • Method for extremely fast preparing ferroferric oxide/graphene lithium ion battery composite negative electrode material

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Experimental program
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Effect test

Embodiment 1

[0017] Measure 5 milliliters of graphene oxide solution (4 milligrams per milliliter), disperse it in 25 milliliters of deionized water, and disperse it completely by ultrasonication at 25 watts and 40 kHz for 0.5 hours. The obtained brown-yellow graphene oxide solution was heated up to 90 degrees centigrade, and mechanically stirred continuously. Weigh 140 mg of ferrous sulfate (0.5 mmol), dissolve it in 10 ml of deionized water to obtain a ferrous ion solution, and quickly add it to the graphene oxide solution. Measure 1 milliliter of ammonia water (28wt.%), add it dropwise in the mixed solution of ferrous ion and graphene oxide, with vigorous stirring, you can get magnetic ferric oxide / graphene composite material in 1 minute . The mixed system was continuously stirred at 90° C. for 5 minutes to stabilize its structure and further reduce the graphene. The obtained black solid was washed six times with deionized water, frozen, and dried in a lyophilizer to obtain a ferric o...

Embodiment 2

[0019] According to the main process method in Example 1, after adding excess ammonia water, the mixed system reacted at 90 degrees Celsius for 1 minute, and continued to stir at low temperature for 2 hours, changing the low temperature stability and reduction time, and the prepared trioxide The iron / graphene-5min-2h composite nano-carbon material was tested for electrochemical performance. After 200 cycles at a current density of 1 amp / g, the discharge specific capacity was 1024 mAh / g.

Embodiment 3

[0021] According to the main process method in Example 1, after adding excess ammonia water, after the mixed system reacted at 90 degrees Celsius for 1 min, it was continuously stirred at low temperature for 5 hours, and the low temperature stability and reduction time were changed, and the prepared ferric iron tetroxide was / Graphene-5h composite nano-carbon material was tested for electrochemical performance. After 200 cycles at a current density of 1 amp / g, the discharge specific capacity was 571 mAh / g.

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Abstract

Development of efficient, clean and continuable new energy is extremely urgent for dual challenges of energy and environment problems. Development of a novel lithium ion battery composite negative electrode material which is high in performance and easy to prepare is an important path for solving energy and environment difficulties. The invention belongs to the field of energy and chemical industry and carbon nanometer material science, ferrous sulfate and oxidized graphene are used as raw materials, and excessive ammonium hydroxide is used as a precipitant, so that in-situ deposition of ferroferric oxide can be achieved within 1min, and thus the ferroferric oxide / graphene lithium ion battery composite negative electrode material can be fast prepared. Embedding and disembedding of lithium ions are facilitated due to the compactly combined ferroferric oxide / graphene composite structure, electrical conductivity of the electrode material is improved, volume expansion of ferroferric oxide nano-particles is effectively relieved, long-term cycling stability of the composite material is ensured, and thus electrochemical performance of a lithium ion battery is effectively enhanced; and the method provided by the invention is an effective method for preparing the efficient lithium ion battery composite negative electrode material in a large scale and with low cost.

Description

technical field [0001] The invention belongs to the field of energy chemical industry and carbon nanomaterials, and relates to an ultra-fast preparation of ferric oxide / graphene lithium ion by using ferrous sulfate and graphene oxide as raw materials through an instantaneous redox and in-situ precipitation process Composite anode materials for batteries. This method uses ammonia water as the precipitating agent to achieve instant redox in-situ precipitation within 1 minute. The transition metal oxide prepared is green, pollution-free and high theoretical capacity ferroferric oxide. The carbon nano-skeleton material has a large specific surface area, Graphene with good electrical conductivity and flexible cushioning effect. The present invention synthesizes a metal oxide / nano-carbon composite material that tightly and uniformly loads iron ferric oxide nanoparticles on a graphene skeleton. The volume expansion of ferroferric oxide enhances the stability of the electrode materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/62H01M10/0525B82Y40/00
CPCB82Y40/00H01M4/362H01M4/523H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 赵青山刘加亮武晓翠臧家振吴明铂宁汇
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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