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Reduction oxidation graphene-trimanganese tetraoxide three-dimensional composite material preparation method

A technology of trimanganese tetraoxide and composite materials, which is applied in the field of preparation of reduced graphene oxide-trimanganese tetraoxide three-dimensional composite materials, can solve the problems of limiting the performance of lithium-ion positive electrode materials, uneven distribution of prepared products, and poor cycle stability. Achieve excellent electrochemical performance, low equipment requirements, and excellent electrical conductivity

Active Publication Date: 2017-06-13
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And most of the products have a series of problems such as graphene and metal oxide agglomeration, uneven distribution of prepared products, poor cycle stability and low specific capacity, which limit the improvement of its performance as a lithium ion cathode material.

Method used

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  • Reduction oxidation graphene-trimanganese tetraoxide three-dimensional composite material preparation method
  • Reduction oxidation graphene-trimanganese tetraoxide three-dimensional composite material preparation method
  • Reduction oxidation graphene-trimanganese tetraoxide three-dimensional composite material preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Weigh 50 mg of graphene oxide microchips, add it to 25 mL of deionized water, place it in a cell pulverizer for 0.8 h to obtain a 2 mg / ml graphene oxide dispersion, and dissolve 0.2 mmol of manganese chloride tetrahydrate into 10 mL Add the above-mentioned graphene oxide dispersion into deionized water, and stir well. Add 1mL of ammonia solution to the above mixture, and put the system into the ultrasonic reactor, give a certain degree of mechanical stirring, and ultrasonic for about 15min. The obtained system was transferred to a 50mL hydrothermal reaction kettle, reacted at 160°C for 20h, and then the product was taken out and soaked in distilled water for 3 times, 0.5h each time. The washed product was transferred to a freeze dryer for drying, and the final product was obtained after drying at -65° C. for 72 h.

[0042] The obtained final samples were characterized by SEM, TEM and XRD, and the cycle performance test was carried out by electrochemical workstation.fig...

Embodiment 2

[0044] Weigh 40 mg of graphene oxide microchips, add them to 25 mL of deionized water, place them in a cell pulverizer for 1 hour to obtain a 1.6 mg / ml graphene oxide dispersion, and dissolve 0.1 mmol of manganese chloride tetrahydrate into 10 mL Add the above-mentioned graphene oxide dispersion into deionized water, and stir well. Add 1mL of ammonium chloride solution to the above mixture, and put the system into the ultrasonic reactor, give a certain degree of mechanical stirring, ultrasonic for about 15min, the ultrasonic power of the ultrasonic reactor is 250W. The obtained system was transferred to a 50mL hydrothermal reaction kettle, reacted at 170°C for 20h, and then the product was taken out and soaked in distilled water twice, each time for 0.6h. The washed product was transferred to a freeze dryer for drying, and the final product was obtained after drying at -70° C. for 76 h.

[0045] The obtained final samples were characterized by SEM, TEM and XRD, and the cycle ...

Embodiment 3

[0047] Weigh 60mg of graphene oxide microchips, add it to 25mL of deionized water, place it in a cell pulverizer for 1.2h, obtain a 2.4mg / ml graphene oxide dispersion, and dissolve 0.4mmol of manganese chloride tetrahydrate into 10mL deionized water, add the above graphene oxide dispersion, and stir well. Add 1mL of ammonium sulfate solution to the above mixture, and put the system into the ultrasonic reactor, give a certain degree of mechanical stirring, ultrasonic for about 23min, the ultrasonic power of the ultrasonic reactor is 250W. The obtained system was transferred to a 50 mL hydrothermal reaction kettle, reacted at 200°C for 20 h, and then the product was taken out and soaked in distilled water for 4 times, 0.4 h each time. The washed product was transferred to a freeze dryer for drying, and the final product was obtained after drying at -80° C. for 72 h.

[0048] The obtained final samples were characterized by SEM, TEM and XRD, and the cycle performance test was ca...

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Abstract

The invention discloses a reduction oxidation graphene-trimanganese tetraoxide three-dimensional composite material preparation method, which comprises: mixing a graphene oxide dispersion liquid and a single or mixed metal salt solution, completely mixing the obtained mixture and an amine substance, placing in a high temperature reaction kettle, carrying out a complete reaction at a certain temperature, soaking, and carrying out freeze drying treatment to directly prepare the graphene-metal oxide three-dimensional composite material having a self-supporting structure. According to the present invention, the reduction oxidation graphene-trimanganese tetraoxide three-dimensional composite material prepared through the preparation method can be directly used as the lithium ion battery positive electrode without the additional addition of the electric conduction agent and the binder, and has excellent cycle stability and excellent rate performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for preparing a reduced graphene oxide-trimanganese tetraoxide three-dimensional composite material with excellent electrochemical properties. Background technique [0002] At present, all kinds of electronic products emerge in an endless stream. While they bring convenience to people's life, they also face many problems that cannot be ignored. The existing fixed power supply is difficult to maintain long-term operation, which greatly discounts the experience of consumers. The ideas to solve this problem mainly focus on the following two aspects: one is to develop high-energy-density materials to prolong the service time of batteries after a single charge; the other is to develop fast-charge batteries to increase the charging speed of batteries. The above two ideas have put forward higher requirements on the performance of the battery. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/505H01M10/0525
CPCH01M4/362H01M4/505H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 张以河吕凯凯孙黎
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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