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Graphene array composited anode as well as preparation method and application thereof

A graphene array, graphene technology, applied in battery electrodes, nanotechnology for materials and surface science, electrical components, etc., can solve the weak interaction between sulfur and carbon matrix surface, the cycle performance cannot reach practical, active Problems such as low adsorption capacity, to achieve the effects of excellent cycle performance, fast electron transfer and charge transfer, and reduced dissolution

Inactive Publication Date: 2015-01-07
NANJING ZHONGCHU NEW ENERGY
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AI Technical Summary

Problems solved by technology

However, graphene is prone to agglomeration, which greatly reduces its surface area as an electrode material, seriously reducing its actual specific surface area and performance as an active material carrier, which not only makes it difficult for the electrolyte to fully contact with the graphene surface. Contact, and the adsorption amount of active substances is small, and the utilization rate is low
At the same time, limited by the porous structure and surface chemistry of carbon-based materials, the interaction between sulfur and the surface of the carbon matrix is ​​very weak, resulting in uneven distribution of sulfur in the carbon matrix, and the composite material still has poor stability, low sulfur content and problems in practical applications. Due to the disadvantages of limited processing performance, it is difficult to completely suppress the dissolution and loss of polysulfides only by the confinement and surface adsorption of carbon material pores, and the cycle performance cannot reach a practical level.

Method used

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  • Graphene array composited anode as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A 30 μm thick nickel current collector is placed in the quartz glass tube of a tubular resistance furnace, and a 1000 sccm mixture of argon and hydrogen is introduced, where the volume ratio of hydrogen is 1%, and the temperature is raised to 650 ° C at the same time; the voltage is adjusted to 10 kV, Generate a stable glow plasma to remove impurities on the surface of the substrate. After 10 minutes, feed 150 sccm methane and 1350 sccm argon, and feed water vapor at the same time, control the relative humidity at 40%, then stop feeding the mixed gas of argon and hydrogen, and react for 20 min , and then lower the temperature to room temperature in a reducing atmosphere to prepare a graphene array.

Embodiment 2

[0039] Use a metal titanium substrate, attach iron powder on its surface, place it in a chemical vapor deposition chamber, and seal it; apply a magnetic field in the vertical direction of the substrate, the magnetic field strength is 0.01T, and pass 50 sccm argon gas for 30 minutes to remove oxygen in the reaction chamber, and heat the lining The temperature was lowered to 700°C, and then 100 sccm of methane was introduced and kept for 1 hour. After the reaction, stop heating, turn off the methane, and cool to room temperature under the protection of argon. The product was taken out, washed with 1mol / L hydrochloric acid, and dried to obtain a graphene array.

Embodiment 3

[0041] The prepared graphene array and elemental sulfur were put into a tube furnace at a mass ratio of 1:10, heated to 155° C., and kept for 10 h under nitrogen gas to form a sulfur-loaded graphene array.

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Abstract

The invention discloses a graphene array based carbon and sulfur composited anode. The anode is composited by a graphene array, titanium dioxide and sulfur and has huge specific surface area and excellent electric conductivity, wherein the graphene array is vertically grown on a conductive substrate material and forms a three-dimensional network conductive frame, the active material sulfur is uniformly loaded on the surface and in holes of the conductive frame, and an outer layer is coated with titanium dioxide. Therefore, a prepared secondary aluminum battery has higher specific capacity and good cycle performance, the preparation procedure is simple, and the composited anode is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of battery material science, and relates to a graphene array carbon-sulfur composite positive electrode and its preparation, and also relates to a secondary aluminum battery including the composite positive electrode. Background technique [0002] With the rapid development of new power sources such as electronic and communication equipment, electric vehicles, wind power generation and photovoltaic power generation, human beings have higher and higher requirements for battery performance of supporting power sources, and there is an urgent need to develop batteries with high energy, low cost, long life, and green , Power batteries and energy storage batteries that are rich in battery material resources and recyclable. Secondary aluminum-sulfur battery is a new type of battery system with high energy density, which has high application potential and commercial value. [0003] The working principle of the secondary alum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M10/36
CPCB82Y30/00H01M4/139H01M4/362H01M10/054Y02E60/10
Inventor 赵宇光钟毓娟
Owner NANJING ZHONGCHU NEW ENERGY
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