Anion sublattice design enables superionic conductivity in crystalline oxyhalides.
basic_science · Level V
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- Record sourced from PubMed, PMID 41066552.
- Also identified by DOI 10.1126/science.adt9678.
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Abstract
Solid-state batteries are attractive energy storage systems as a result of their inherent safety, but their development hinges on advanced solid-state electrolytes (SSEs). Most SSEs remain largely confined to single-anion systems (e.g., sulfides, oxides, halides, and polymers). Through mixed-anion design strategy, we develop crystalline Li<sub>3</sub>Ta<sub>3</sub>O<sub>4</sub>Cl<sub>10</sub> (LTOC) and its derivatives with excellent ionic conductivities (up to 13.7 millisiemens per centimeter at 25°C) and electrochemical stability. The LTOC structure features mixed-anion spiral chains, consisting of corner-shared oxygen and terminal chlorine atoms, which induces continuous "tetrahedron-tetrahedron" Li-ion migration pathways with low energy barriers. Additionally, LTOC demonstrates holistic cathode compatibility, enabling solid-state batteries operation at 4.9 volts versus Li/Li<sup>+</sup> and low temperature, down to -50°C. These findings describe a promising class of superionic conductors for high-performance solid-state batteries.