Ag/Br dual-doped Li6PS5Br electrolyte with superior conductivity for all-solid-state batteries

Lithium argyrodites electrolyte with high ionic conductivity and relatively lower cost show great potential as candidates for solid-state batteries. Further improvement of their conductivities can accelerate their applications. One of the means to significantly promote the conductivity of Li-ion is dual doping. Herein, Ag/Br dual-doping strategy is applied on Li 6 PS 5 Br (2.76 mS cm −1 ) to boast its conductivity to 6.15 mS cm −1 for Li 5.55 Ag 0.05 PS 4.6 Br 1.4 . The structural variations and chemical/electrochemical stability of the obtained electrolyte are carefully investigated. Li 3 InCl 6 electrolyte is introduced in the new battery configuration to mitigate the interfacial instability with LiNi 0.6 Mn 0.2 Co 0.2 O 2 active material enabling good electrochemical performances . The assembled battery delivers a discharge capacity of 160.8 mAh g −1 for the 1st cycle and maintains 85.9% of the initial value after 50 cycles at 0.5C. This modification strategy was proved effective for increasing the conductivity of sulfide electrolytes in this work.