Enhancing The Electrochemical Performances Of Li7p3s11 Electrolyte Through P2o5 Substitution For All-Solid-State Lithium Battery

Li7P3S11 (70Li(2)S center dot 30P(2)S(5)) sulfide is a promising electrolyte candidate for all-solid-state lithium batteries (ASSLBs) owing to its high ionic conducivity and wide electrochemical stability window. However, the sensitivity to moisture and the poor interfacial compatibility with electrodes limit the conventional application of Li7P3S11. Herein, we present a substitution strategy to produce a O-incorporated 70Li(2)S center dot(30-x)P2S5 center dot xP(2)O(5) (mol%) sulfide electrolyte to address above issues. The elaborately designed electrolyte is prepared via wet vibration ball milling technique with P2O5 substitution content of 1, 3 and 5. As a result, the 70Li(2)S center dot 27P(2)S(5)center dot 3P(2)O(5) electrolyte displays the highest ionic conductivity of 2.61x 10(-3) S cm(-1) which outperforms than that of pristine Li7P3S11 (ionic conductivity of 1.35 x 10(-3) S cm(-1)) and the assembled LiCoO2@LiNbO3/70Li(2)S center dot 27P(2)S(5)center dot 3P(2)O(5)/Li-In ASSLB exhibits the superior capacity retention of 93.2% after 100 cycles at 0.5C. The reason for the developed electrochemical performance lies in the substitution of the non-bridging sulfur atom with bridging oxygen atom, from which the interaction between electrolyte and lithium ions is weakened, thereby the rapid transfer of lithium ions is facilitated. Furthermore, Raman and XRD results indicate that the adverse interfacial reactions are suppressed through P2O5 substitution. This work suggests that P2O5 substitution is an effective strategy for sulfide electrolyte toward high energy all-solid-state lithium batteries.