一种石墨烯包覆二氧化锰的复合电极材料及其制备方法

Graphene-cladding manganese dioxide combination electrode material and method for producing same

Abstract

A graphene-cladding manganese dioxide combination electrode material and a method for producing the same, belonging to the technical field of electronic functional materials, the graphene-cladding manganese dioxide combination electrode material comprises nano manganese dioxide particles and graphene cladded with manganese dioxide particles, wherein the mass ratio of graphene and the nano manganese dioxide particles is 1:(1.25-10). The method comprises the following steps: preparing the nano manganese dioxide particles and graphite oxide respectively, and mixing and ultrasonically dispersing to obtain the graphene-cladding manganese dioxide dispersing agent, finally, reducing the graphite oxide to obtain the graphene-cladding manganese dioxide combination electrode material. The graphene is used to clad the manganese dioxide, so the electrical conductivity and cycling stability of the electrode material parts can be improved; and meanwhile, the existence of the manganese dioxide particles also effectively prevents the graphene from reunion, so the specific capacity of the electrode material of a supercapacitor is obviously increased. The method has a simple technology, reaction products are easy to control, the purity is high, and the produced combination electrode material is suitable for producing an electrode plate of the supercapacitor.
一种石墨烯包覆二氧化锰的复合电极材料及其制备方法,属电子功能材料技术领域。包括纳米二氧化锰颗粒和包覆纳米二氧化锰颗粒的石墨烯,其中石墨烯与纳米二氧化锰颗粒的质量比为1:(1.25~10)范。先分别制备纳米二氧化锰颗粒和氧化石墨,然后将纳米二氧化锰颗粒和氧化石墨混合超声分散,得到氧化石墨烯包覆二氧化锰的分散液,最后还原氧化石墨烯,得到石墨烯包覆二氧化锰的复合电极材料。本发明用石墨烯包覆二氧化锰,可增加电极材料颗粒的导电性和循环稳定性;同时,二氧化锰颗粒的存在也有效地防止了石墨烯的团聚,显著增加了超级电容器电极材料的比容量。本发明工艺简单、易于控制反应产物、纯度高,所制备的复合电极材料适用于制作超级电容电极片。

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