This invention provides a membrane
electrode material and its preparation method, as well as the application of the material into
lithium extraction by adsorption-electrochemical
coupling method. The membrane
electrode material is described as MnO@C. The preparation steps are as follows: LiMn2O4 is firstly obtained by calcining
lithium carbonate and
manganese carbonate, which is then dispersed in
hydrochloric acid solution. After stirring and separating, the
solid products are dried to obtain λ-MnO2. The λMnO2 is added to the
raw material of Mn-MOF-74, and then the Mn-MOF-74 coated λ-MnO2 can be obtained by
hydrothermal reaction. By further calcining Mn-MOF-74 coated λ-MnO2 in
nitrogen atmosphere, the membrane
capacitor /
electrode material can be obtained as MnO@C. The material is fabricated into an adsorption film electrode plate and assembled into an adsorption-electrochemical
coupling lithium extraction device. The pure lithium solution can be obtained in the
recovery pool through the combined lithium extraction and lithium
recovery process. In this invention, the thickness of the
carbon coating layer in the
electrode material is adjustable. Adsorption-electrochemical
coupling technology takes the advantages of both adsorption and electrochemical
lithium intercalation, which can extract and recover lithium resources with high capacity. Thus, this invention not only achieves high-efficiency separation of lithium resources, but also opens up a new way for the extraction of lithium resources.