Three-dimensional self-supporting composite structure electrode and its preparation method, lithium-air battery

Abstract

The invention discloses a three-dimensional self-supporting composite structure electrode, a preparation method thereof and a lithium air battery. The preparation method of the three-dimensional self-supporting composite structure electrode comprises the following steps: firstly, cutting a polyurethane sponge material into a required shape, and then carrying out carbonization treatment; immersingthe carbonized polyurethane sponge into the graphene oxide solution, taking out and drying; and soaking the dried material in a catalyst solution, taking out, airing, and carrying out low-temperaturereduction to obtain the three-dimensional self-supporting composite structure electrode. According to the composite structure electrode, fibers of carbonized polyurethane sponge serve as a framework and serve as an integral conductive network, the outer surfaces and gaps of the fibers of the carbonized polyurethane sponge are wrapped and filled with reduced graphene oxide and a catalyst, so that the conductivity and the specific surface area of the electrode are increased, and a large number of active sites are provided for reaction. The electrode does not contain a binder and can effectivelyprevent side reactions in the charging and discharging process of the battery, so that the energy density of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of battery electrodes, in particular to a positive electrode used as a component such as a lithium-air battery, a preparation method thereof, and a lithium-air battery with the positive electrode. Background technique [0002] With the development of science and technology, lithium-air batteries have attracted people's attention. Because lithium-air batteries have high theoretical energy density and high specific capacity, compared with common lithium-ion battery cathode materials, as the positive electrode active material of lithium-air batteries-oxygen can be provided by the external environment-air, which is environmentally friendly and low in cost. , so it has considerable development and application prospects. Therefore, it is necessary to prepare highly efficient and porous cathode materials. The negative electrode of lithium-air batteries is lithium metal, and the positive electrode is a porous carb...

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Problems solved by technology

[0005] In order to solve the problems of high energy consumption, low efficiency, and high cost in the preparation of existing three-dimensional self-supporting electrodes, the present invention proposes an energy-saving, environmentally friendly, simple to manufacture, and low-cost three-dimensional self-supporting composite structure electrode and its preparation method, which has the Li-air batteries with electrodes

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