Silicon-Tungsten Trioxide Carbon Anode for Stable Li-Ion Capacity

The patent applies composite materials by combining carbon, tungsten trioxide, and silicon into a ternary composite structure. The carbon provides a stable base with good conductivity, tungsten trioxide forms on the carbon surface to facilitate lithium ion diffusion, and silicon is incorporated to enhance capacity. This composite approach leverages the complementary strengths of each material to achieve superior battery performance that neither material could provide alone.

The patent applies local quality by creating a heterogeneous composite structure where different materials are strategically positioned. Silicon is distributed within the carbon matrix and on the surface, surrounded by the stable carbon structure and tungsten trioxide layers. This local arrangement allows silicon to contribute its high capacity while the surrounding carbon and tungsten trioxide provide structural stability and prevent silicon from undergoing harmful volume expansion during lithium ion insertion and extraction.

The patent applies preliminary action by pre-forming the complex ternary composite structure during the electrode manufacturing process itself. The carbon, tungsten trioxide, and silicon are combined in a slurry or coating process where the components self-assemble into the desired composite structure before being formed into the final electrode. This preliminary formation of the composite structure eliminates the need for subsequent complex assembly steps, reducing manufacturing complexity while achieving the performance benefits of the ternary composite.