Manufacturing Method for Silicon Nanowires, Silicon-Based Anode Active Material Using the Same, and Manufacturing Method for Lithium Secondary Batteries

Silicon Anode Material with Suppressed SEI via Spaced Conductive Metal Particles on Nanowire Surfaces

This technology facilitates lithium-ion transport and controls the formation of the Solid Electrolyte Interphase (SEI) by depositing highly conductive metal particles on the surface of silicon nanowires at intervals of 10 nm to 1 µm.

When silicon nanowires are used as anode active materials, an SEI layer forms on the surface during high-speed charging and discharging. This has historically limited performance by reducing specific capacity and degrading cycle characteristics.

This technology involves selectively etching a silicon substrate using a metal catalyst to create nanowires, followed by applying conductive metal particles—such as Cu, Al, Zn, Fe, Pb, Ag, or Au—via drop coating or spray aerosol deposition. By spacing these particles, the process lowers electrode resistance and inhibits SEI layer formation. Suitable for high-rate discharge applications like drone and robot batteries or fast-charging smartphone cells, this method provides nanowires with optimized ion channels and electron pathways simply by adjusting particle spacing.

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Key Features:

• Forming first metal particles of silver, gold, or platinum spaced apart on a silicon substrate
• Forming silicon nanowires by selectively wet-etching the silicon substrate with an etching solution of hydrofluoric acid, hydrogen peroxide, and deionized water
• Removing the first metal particles and forming second metal particles spaced apart on the surface of the silicon nanowires via drop coating
• Metal particles selected from Al, Zn, Fe, Pb, Ag, or Au, formed on the nanowire surface at intervals of 10 nm to 1 µm

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