Silicon Monoxide Composite Anode With CNT Coating for Low Conductivity

The patent applies composite materials by combining silicon monoxide particles with carbon nanotubes to form a composite negative electrode material. The carbon nanotubes are grown on the surface of silicon monoxide particles through chemical vapor deposition, creating a conductive network that improves electrical conductivity while preserving the high capacity of silicon monoxide. This composite structure resolves the contradiction between high capacity and poor conductivity.

The patent applies local quality by creating a carbon nanotube coating layer specifically on the surface of silicon monoxide particles. The carbon nanotubes form a conductive network at the surface level, providing local electrical conductivity enhancement without altering the bulk properties of silicon monoxide. This localized modification allows the material to maintain its high theoretical capacity while gaining improved conductivity where it is most needed - at the electrode interface.

The patent uses composite materials combining silicon monoxide with carbon nanotubes to improve initial coulombic efficiency. The carbon nanotube coating provides a stable interface for lithium ion insertion and extraction, reducing irreversible capacity loss during initial cycles. This composite structure enables the material to achieve both high theoretical capacity and improved initial coulombic efficiency.

The patent applies local quality by modifying the surface of silicon monoxide particles with a carbon nanotube coating. This surface modification creates a stable interface that facilitates efficient lithium ion transport during initial cycles, improving initial coulombic efficiency without affecting the bulk capacity of silicon monoxide. The localized carbon coating provides a protective and conductive interface that enhances electrochemical performance.

The patent applies composite materials by combining silicon monoxide (high capacity) with carbon nanotubes (good conductivity and stability). This composite structure allows the negative electrode to achieve theoretical capacity exceeding 2100 mAh/g from silicon monoxide while the carbon nanotube network provides the conductivity and interface stability needed for high initial coulombic efficiency, thus overcoming graphite's capacity limitation.

The patent applies parameter changes by fundamentally changing the negative electrode material from graphite (372 mAh/g capacity) to silicon monoxide-based composite (2100 mAh/g capacity). This parameter change in material composition enables a five-fold increase in theoretical specific capacity while the carbon nanotube coating ensures that initial coulombic efficiency remains high through improved electrical conductivity and stable lithium ion interface.