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Lithium-ion conducting solid electrolytes show potential to enable high-energy-density secondary batteries and offer distinctive safety features as an advantage over traditional liquid electrolytes. Achieving the combination of high ionic conductivity, low activation energy, and outstanding electrochemical stability in crystalline solid electrolytes is a challenge for the synthesis of novel solid electrolytes. Herein we report an exceptionally low activation energy (Ea) and high room temperature superionic conductivity via facile aliovalent substitution of Li3AsS4 by Ge, which increased the conductivity by two orders of magnitude as compared with the parent compound. The composition Li3.334Ge0.334As0.666S4 has a high ionic conductivity of 1.12 mS cm−1 at 27 °C. Local Li+ hopping in this material is accompanied by a distinctive low activation energy Ea of 0.17 eV, being the lowest of Li+ solid conductors. Furthermore …