Li2S Composite Cathode Using Halogenated LPS for Solid-State Cycling

The patent uses a composite solid electrolyte system combining sulfide-based solid electrolyte particles with a conductive matrix material. This composite structure allows the sulfide particles to provide high lithium ion conductivity and stability, while the conductive matrix ensures sufficient lithium ion diffusivity throughout the electrode, resolving the contradiction between safety/stability and ion transport speed.

The patent employs a porous electrode structure where sulfide solid electrolyte particles are distributed within a conductive matrix. The porous architecture provides pathways for lithium ion diffusion while maintaining intimate contact between active material, solid electrolyte, and conductive matrix, ensuring both high safety/stability and adequate ion diffusivity.

The patent uses a flexible conductive matrix that can accommodate volume changes of electrode components during charging and discharging. This matrix acts as a buffer that maintains mechanical integrity and prevents loss of contact between components, allowing the electrode to achieve high electrochemical capacity without suffering from mechanical stress or contact degradation.

The composite electrode structure consisting of active material particles, solid electrolyte particles, and conductive matrix provides mechanical flexibility. The conductive matrix serves as a resilient framework that absorbs volume expansion and contraction, maintaining electrical and ionic connectivity throughout cycling, thus enabling high capacity with good mechanical stability.

The patent extracts sulfur from the traditional liquid electrolyte environment and confines it within a solid-state matrix. By using sulfide solid electrolyte particles embedded in a conductive matrix, the system eliminates polysulfide dissolution while maintaining high sulfur utilization, achieving both high capacity and cycling stability.

The conductive matrix acts as an intermediary between sulfur active material and the external circuit. It provides a stable solid-state environment that prevents polysulfide formation and dissolution, while still enabling efficient electron and ion transport, thus preserving both high capacity and cycling reliability.