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Oxide-graphite interlayer compound, preparation method thereof, electrode and battery

An interlayer compound, graphite interlayer technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of no obvious increase in battery energy density, little progress in research on carbon cathode materials, and no market competitiveness. problem, to achieve the effect of good electrical conductivity, high thermal conductivity, and improved energy density

Inactive Publication Date: 2019-06-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, little progress has been made in the research of carbon cathode materials.
The Gaochao team of Zhejiang University used graphene instead of crystalline graphite to make the cathode of aluminum batteries. Although significant progress has been made in charge-discharge rate and cycle life, the energy density of the battery has not increased significantly.
Moreover, graphene is expensive, and it is not competitive in cost compared with traditional carbon electrodes.

Method used

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  • Oxide-graphite interlayer compound, preparation method thereof, electrode and battery
  • Oxide-graphite interlayer compound, preparation method thereof, electrode and battery
  • Oxide-graphite interlayer compound, preparation method thereof, electrode and battery

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preparation example Construction

[0030] The second aspect of the present invention provides a kind of preparation method of above-mentioned oxide-graphite interlayer compound, it comprises the following steps:

[0031] 1) Mix flake graphite with a particle size of less than 300 meshes and precursors of silicon oxide, aluminum oxide or titanium oxide in a weight ratio of 1:2 to 1:4 evenly.

[0032] Since it is impossible to directly insert silicon oxide, aluminum oxide or titanium oxide into the graphite structure layer, the present invention uses precursors of silicon, aluminum, titanium oxides.

[0033] The precursor of silicon oxide, aluminum oxide or titanium oxide is one of silane coupling agent, aluminate, titanate compound or aluminum trichloride, preferably n-octyltriethoxysilane (English name: Triethoxyoctylsilane; trade name: silane coupling agent), distearoyl isopropoxy aluminate (English name: Distearoyl IsopropoxyAluminate; trade name: aluminate coupling agent), isopropyl trihard Fatty acid titan...

Embodiment 1

[0075] 1) Mix flake graphite with a particle size of less than 300 mesh and n-octyltriethoxysilane in a weight ratio of 1:2, and put it into a mill.

[0076] 2) After grinding for 2 hours, take the material out and place it in a closed container to bathe in water vapor for 2 hours.

[0077] 3) After the material is taken out from the container, it is dried in an oven, then kept at a constant temperature in a muffle furnace at 120°C for 3 hours, and cooled to room temperature to obtain a silicon oxide-graphite intercalation compound.

Embodiment 2

[0079] 1) Mix flake graphite with a particle size of less than 300 mesh and distearoyloxyisopropoxyaluminate at a weight ratio of 1:4, heat to 60°C, and put it into a mill.

[0080] 2) After grinding for 6 hours, take the material out and place it in a closed container to bathe in water vapor for 6 hours.

[0081] 3) After the material is taken out from the container, it is dried in an oven, then kept at a constant temperature in a muffle furnace at 400°C for 1 hour, and cooled to room temperature to obtain an alumina-graphite interlayer compound.

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Abstract

The invention discloses an oxide-graphite interlayer compound, a preparation method thereof, an electrode and a battery; the oxide-graphite interlayer compound is an interlayer compound formed by inserting silicon oxide, aluminum oxide or titanium oxide between natural graphite crystalline structure layer pieces. The silicon oxide, aluminum oxide or titanium oxide particles located at the graphitelattice interlayer position have very high electrochemical activity in the charging and discharging process, and the energy density of the electrode can be obviously improved. Through surface activation, a dispersing agent and a binding agent are added and uniformly mixed, the interlayer compound is pressed, formed and dried to obtain an oxide-graphite interlayer compound electrode. The oxide-graphite interlayer compound electrode is suitable for various types of batteries using carbon electrodes. The aluminum ion battery with the carbon electrode used as a cathode, the metal aluminum used asan anode, and aluminum ionic liquid as an electrolyte solution is superior to the lithium ion battery in the aspects of energy density, charging and discharging performance, safety performance and the like. The battery is widely applied to electric appliances such as mobile phones, cameras and the like and power batteries of various vehicles, ships, unmanned aerial vehicles and underwater submerged devices.

Description

technical field [0001] The invention belongs to the field of energy, and specifically relates to an oxide-graphite interlayer compound, a preparation method thereof, an electrode and a battery. Background technique [0002] The energy density of a battery depends on factors such as the anode material, the capacity of the cathode material, and the performance of the electrolyte solution. For a long time, people's efforts to increase the energy density of batteries have been mainly aimed at anode materials. Taking lithium-ion batteries as an example, replacing lithium iron phosphate with ternary systems has increased the theoretical capacity of anode materials from 170mAh / g to nearly 300mAh / g. However, little progress has been made in the research of carbon cathode materials. The Gaochao team of Zhejiang University used graphene instead of crystalline graphite to make the cathode of aluminum batteries. Although significant progress has been made in charge-discharge rate and c...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/587H01M4/62H01M10/0525
CPCY02E60/10
Inventor 叶瑛夏天张平萍
Owner ZHEJIANG UNIV
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