Abstract
Li10SnP2S12 represents a quintessential sulfide solid-state electrolyte that has garnered considerable interest within the domain of solid-state batteries. However, it still has much room for enhancing its ionic conductivity and air stability. In this paper, Li10SnP2S12 was modified by solid-phase sintering method using different doping amounts of Nb2O5. XRD refinement confirmed that Nb and O elements were successfully doped into the P and S sites, in which the ionic conductivity of Li10SnP1.96Nb0.04S11.9O0.1 was up to 2.93 mS cm−1 at room temperature. After Nb2O5 doping, the lattice volume expands due to the larger ionic radius of Nb5+ compared to P5+. This expansion broadens the channels through which lithium ions travel, thereby enhancing Li+ conductivity. O doping improves the stability of the sulfide against moisture and forms a strong PO bond with P, which resists further oxidation. The air stability test demonstrated enhanced air stability of the doped electrolyte. The AC impedance test conducted at various temperatures confirmed that the doped electrolyte exhibits lower activation energy, which facilitates an enhancement in Li+ conductivity. Finally, the assembled Li-In/Li10SnP1.96Nb0.04S11.9O0.1/LNO@LCO battery exhibits higher first turn discharge specific capacity and good cycle stability.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call