Development of high-performance polyanion cathodes for all-solid-state batteries - CME Seminar Series Winter 2026

The transition from conventional liquid-based lithium-ion batteries to all-solid-state lithium-ion batteries (ASSLIBs) is a transformative step toward safer and higher-energy-density energy storage systems. While polyanion cathodes, particularly LiFePO4 (LFP), offer exceptional thermal stability and cost-effectiveness, their practical deployment in solid-state configurations is restricted by inherently low electronic conductivity and significant interfacial resistance. My doctoral research addresses these bottlenecks through a comprehensive review and targeted experimental optimization.

The first phase establishes a foundational understanding by reviewing polyanion cathodes in ASSLIBs. Analyzing materials such as LFP, LiCoPO4 and Li3V2(PO4)3 across various solid electrolytes, this work identifies interfacial incompatibility and continuous ion-transport pathways as the primary prerequisites for high-performance cells.

Building on this, my first experimental project optimized the cathode formulation in a halide-based Li3InCl6 (LIC) system. We determined that a 40 wt% LFP composition yields the critical balance between active material loading and ionic percolation, maximizing lithium-ion diffusion while minimizing polarization. Finally, the second phase addresses electronic conductivity by incorporating advanced additives like acetylene black and MXene into the composite. This design aims to establish robust conductive networks to support fast-charging capabilities, offering a rational framework for designing high-performance next-generation batteries.