Lithium Titanate-Coated Composite Anode for Reduced Side Reactions

The patent uses composite materials by combining defect-type transition metal oxide with conductive carbon materials (such as graphite, carbon nanotubes, or conductive polymer) to create a composite anode electrode material. The carbon component provides the necessary electrical conductivity while the transition metal oxide provides high theoretical capacity, thus resolving the contradiction between capacity improvement and conductivity deterioration.

The patent introduces conductive carbon materials as an intermediary substance between the transition metal oxide particles and the electrolyte. This intermediary layer improves electron transport pathways while allowing lithium ion insertion/extraction, thereby enhancing electrical conductivity without compromising the high capacity benefits of the transition metal oxide.

The patent introduces conductive carbon materials as a protective intermediary layer that coats or surrounds the defect-type transition metal oxide particles. This carbon layer acts as a barrier that prevents direct contact between the highly active transition metal oxide surface and the electrolyte, thereby suppressing side reactions while maintaining the improved electrical conductivity provided by the defect structure and carbon matrix.

The conductive carbon material creates an inert chemical environment around the transition metal oxide particles, shielding them from direct interaction with the electrolyte. This inert carbon layer prevents unwanted chemical reactions while allowing electrical conduction and lithium ion transport, thus resolving the contradiction between improved conductivity and reduced side reactions.

The patent employs conductive carbon materials as flexible shell structures that encapsulate the transition metal oxide particles. These carbon shells provide mechanical flexibility to accommodate volume changes during lithium ion insertion and extraction cycles, preventing structural damage and pulverization while maintaining electrical conductivity and structural integrity over multiple cycles.

The patent creates a composite structure where transition metal oxide particles are embedded in a carbon matrix or coated with carbon shells. This composite design combines the high capacity of transition metal oxide with the structural stability and flexibility of carbon materials, allowing the anode to withstand volume expansion and contraction during cycling without losing structural integrity.