(164f) Mg3N2 doped Li7P3S11 Solid Electrolytes with Improved Interfacial Compatibility in All Solid-State Li-S Battery
AIChE Annual Meeting
2020
2020 Virtual AIChE Annual Meeting
Materials Engineering and Sciences Division
Poster Session: Materials Engineering & Sciences (08E - Electronic and Photonic Materials)
Thursday, November 19, 2020 - 8:00am to 9:00am
Li7P3S11 is considered as one of the most promising electrolyte materials in all-solid-state Li-S battery due to its high ionic conductivity (comparable with liquid electrolyte). However, the all-solid-state Li-S battery with Li7P3S11 as solid electrolytes has serious interface impedance issues between electrolytes and electrode.[1] The reaction between lithium metal and Li7P3S11 solid electrolyte would form a SEI layer, which could impede lithium ions transfer and transport during charging and discharging, leading to resistance increase and capacity fade. In this study, Li7P3S11 solid electrolyte doping with Mg3N2 were synthesized in liquid phase for an all solid-state lithium sulfur battery.[2] The Mg3N2 decomposed into a mixed ion/electron conducting interlayer to form Li3N and Mg metal (both are good electronic conductor), thus enhance the interfacial compatibility between Li7P3S11 solid electrolyte and lithium metal. With Mg3N2 doped Li7P3S11 as solid electrolytes, the all solid-state Li-S battery exhibits an improved electrochemical performance such as lower resistance, better cycling stability and higher specific capacity.
- Xu, X., et al., Boron nitride doped Li7P3S11 solid electrolyte with improved interfacial compatibility and application in all-solid-state Li/S battery. Journal of Materials Science: Materials in Electronics, 2019.
- Yan, M., et al., Stabilizing PolymerâLithium Interface in a Rechargeable Solid Battery. Advanced Functional Materials, 2019. 30(6).