来源：ACS Publications
Halide solid state electrolytes (SSEs) have gained substantial attention due to their excellent ionic conductivity. However, their interfacial compatibility has been severely criticized. In this work, we synthesized a series of pliable LiCl-[LaCl3–CeCl3-(2-x)GaF3-xAlF3–TaCl5]0.2 SSEs with UCl3 structure to realize excellent cathode/anode interfacial compatibility while ensuring high ionic conductivity. They possess the ionic conductivity up to 1.54 mS cm–1, such excellent ionic conductivity originates mainly from the fast Li+ transport routes in the highly plastic amorphous matrix and rigid UCl3 crystal framework. Integrating it as an additive to conventional halide SSEs (e.g., Li3YCl6) can improve their Li-metal compatibility and provide solid–solid contact stability with the cathode. In addition, applying it as a LiCoO2 cathode additive can construct void-free, highly stable cold-pressed LiCoO2 particles at high voltages and realize high-speed Li+ migration inside the composite cathode. The all-solid-state lithium-ion batteries (ASSLBs) constructed on this basis have realized over 400 cycles at 0.2 C. This work provides a novel approach for the fabrication of halide SSEs with both high ionic conductivity and excellent interfacial compatibility and enables the development of high-performance ASSLBs.