This technology is a layered inorganic nanosheet-graphene composite created by mixing negatively charged metal dichalcogenide nanosheets, metal oxide nanosheets, and graphene, then adding a cation-containing solution to induce electrostatic restacking at room temperature. It forms a hybrid structure with the three 2D materials stacked alternately.
When layered compounds are used as secondary battery anode materials, graphene nanosheets tend to re-aggregate during charge-discharge cycles. This limits the space available for ion transport, resulting in reduced ionic conductivity and poor cycle stability.
This technology prevents graphene aggregation and expands electrode reaction sites by adding a small amount of metal oxide nanosheets, such as TiO2 (0.5 to 5 parts by weight per 100 parts of graphene), between dichalcogenide nanosheets like MoS2 and graphene. The process is simple, utilizing the electrostatic attraction between the positive charge of cations (Na+, Li+, Mg2+, Ca2+) and the negative charge of the nanosheets for room-temperature restacking. Applicable to sodium-ion battery anodes, lithium-alternative large-capacity ESS, and high-rate hybrid electrodes, this small addition of oxide nanosheets lowers charge transfer resistance and improves the capacity retention of graphene-based anodes.
This invention was developed with support from the Ministry of Science, ICT and Future Planning for the development of synthesis methods for energy and bio-functional nano-hybrid materials using exfoliated 2D inorganic nanosheets and graphene nanosheets as a platform.
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