Stabilizing CuTCNQ cathodes in sulfide-based all-solid-state organic lithium batteries via a fluoroiodinated molecular modifier

Abstract

A fluoroiodinated molecular modifier, C₆F₁₃I, is introduced to stabilize the CuTCNQ/Li₆PS₅Cl interface in sulfide-based all-solid-state organic lithium batteries. Its electrochemical activation generates a conformal LiF/LiI/organofluorinated interphase, suppressing electrolyte decomposition, preserving Li⁺ transport, and markedly improving the rate capability and cycling stability of the CuTCNQ cathode.