Anode active material, manufacturing method thereof, and lithium secondary battery comprising the same

Highly Stable Anode Active Material via Single-Atom Noble Metal Substitution on MOF-Derived Carbon Surfaces

This technology improves the electrochemical properties of anodes by heat-treating a metal-organic framework (MOF) containing first and second metals to create a carbonized structure, then reacting it with a doping source to replace surface metals with single-atom doping metals.

Conventional anode active materials in nano-structured or bulk metal states suffer from structural instability during repeated charge-discharge cycles. They also face technical limitations, including poor rate capability and rapid capacity degradation.

This technology uses MOF heat treatment and substitution reactions to anchor noble metals like Ag, Au, and Pt onto the carbon surface as single atoms, filling micropores with metal atoms to ensure stability and conductivity. It can be applied to high-rate lithium-ion battery anodes and lithium metal nucleation hosts, reducing material costs by achieving conductive pathways with only trace amounts of noble metals.

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Key Features:

• Preparing an organic metal framework containing a first and second metal
• Heat-treating the organic metal framework to produce a carbonized structure with the first and second metals provided on the surface in a single-atom state
• Reacting the carbonized structure with a doping source to produce an anode active material where surface metals are replaced by doping metals
• A carbonized structure comprising a plurality of micropores filled with single-atom first metal, second metal, and doping metal

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This invention was developed with support from the Samsung Science and Technology Foundation for research on developing high-capacity/fast-charging electrode materials using sequential gas-phase reactions.

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