This technology is a secondary battery electrode material comprising a heterostructured nanohybrid in which 0D cationic chromium hydroxide nanoclusters are intercalated between exfoliated 2D molybdenum disulfide (MoS2) nanosheets. The negatively charged nanosheets and positively charged nanoclusters are electrostatically self-assembled to form a porous pillared structure with expanded interlayer spacing.
Pure molybdenum disulfide suffers from structural collapse due to significant volume changes during charge and discharge cycles in lithium-ion batteries. Furthermore, its layered structure limits lithium-ion diffusion and charge transfer, hindering improvements in capacity and high-rate performance.
This technology controls the molar ratio of chromium to molybdenum at 3:1 to 5:1 to intercalate nanoclusters, which expands the basal spacing and creates pores to accommodate volume changes and provide ion diffusion pathways. Manufacturing involves a simple self-assembly process: lithium is intercalated into bulk MoS2 to create an exfoliated dispersion, which is then reacted with a chromium salt at pH 4.5–7 at room temperature. Applicable to lithium-ion battery anodes, sodium-ion batteries, and lithium-sulfur and magnesium batteries, it enhances the rate capability and structural stability of MoS2 electrodes through a room-temperature solution process without high-temperature calcination.
This invention was developed with support from the Ministry of Science and ICT’s research on energy-functional hybrid catalysts based on post-graphene inorganic metal compound nanosheets.
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