This technology is a method for manufacturing carbon-coated metal oxide nanocomposites that simultaneously achieves phase transition and carbon coating by heat-treating layered double hydroxide (LDH) precursors in a hydrocarbon gas atmosphere, such as acetylene, at 300°C or below. The resulting composite features a nanocrystalline structure in the form of C-AO-AB2O4, where divalent metal oxides and spinel oxides are encapsulated in carbon.
Transition metal oxide anode materials have historically suffered from volume expansion during charge-discharge cycles and low electrical conductivity. Furthermore, high-temperature calcination for crystallization often leads to particle growth, which reduces the specific surface area and compromises structural stability.
This technology induces phase transition and deposits carbon on the nanoparticle surface by heat-treating LDHs—composed of divalent cations (Mg, Zn, Ni, Co) and trivalent cations (Fe, Al, Mn)—in a C1–C10 alkane, alkene, or alkyne gas atmosphere for under 30 minutes. This low-temperature, short-duration process inhibits particle growth, maintaining nanocrystallinity, while the carbon layer provides conductive pathways, resulting in a specific capacity of over 700 mAh/g. Applicable to conversion-type lithium-ion battery anodes, high-power power tool cells, and mass production lines for low-temperature electrode materials, it enables the production of conductive and structurally stable nano-oxide anodes while reducing energy consumption by eliminating the need for high-temperature calcination equipment.
This invention was developed with support from the Ministry of Science, ICT and Future Planning for the development of chemical synthesis methods for 2D nanostructured composites for lithium-ion battery electrodes with excellent power characteristics.
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