Method for manufacturing a nitrogen-doped carbon-silicon-oxide composite for lithium secondary battery anode active materials using solid-state reaction, an anode, and a lithium secondary battery containing said anode

Nitrogen-doped silicon-based anode material via solid-state reaction of nitrogen-containing organic compounds

This technology involves mixing a silicon precursor with nitrogen-containing organic compounds (such as melamine, PVP, or PAN) and heat-treating the mixture at 500–800°C in an inert atmosphere to produce a carbon-silicon-oxide (CxNySiOz) composite in which nitrogen is chemically bonded to silicon/silicon oxide and carbon.

Silicon-based anode materials have historically faced challenges such as structural collapse due to rapid volume expansion during charge/discharge cycles, irreversible lithium loss (leading to low initial efficiency), and the inherently low electrical conductivity of silicon oxide.

By inducing a solid-state reaction through the addition of nitrogen-containing organic compounds at 10–200% of the silicon precursor's weight, this technology is expected to overcome the limitations of existing materials when applied to secondary battery anodes.

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Key Features:

• Composition involving the synthesis of a specific compound by heating a mixture of a silicon precursor and a nitrogen-containing organic compound
• Composition in which the nitrogen-containing organic compound is added at 10 to 200 percent of the weight of the silicon precursor
• Composition using one of melamine, polyvinylpyrrolidone (PVP), or polyacrylonitrile (PAN) as the nitrogen-containing organic compound
• Composition forming a carbon-silicon-oxide in which nitrogen is chemically bonded to silicon and carbon through heat treatment in an inert atmosphere

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