Nominally stoichiometric Na3(WxSixSb1−2x)S4 as a superionic solid electrolyte

Nominally stoichiometric Na 3 W x Si x Sb 1−2 x S 4 is presented as Na + -conducting solid-state electrolytes. When x = 0.2, it shows the highest ionic conductivity of 13.2 mS cm −1 , despite the absence of intentionally incorporated Na + vacancies.