Graphene array composite positive electrode and its preparation method and application

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...

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.

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