Multi-electron reaction based molybdenum pentasulfide towards high-energy density all-solid-state lithium batteries

Abstract

All-solid-state lithium batteries based on multiple electron reaction cathode can exhibit high reversible specific capacity, and thus realizing high energy density. Improving electronic/ionic conductivities and alleviating volume changes are of great significance for achieving high performance all-solid-state batteries. In this work, amorphous MoS5 nanoparticles are homogeneously anchored on the surface of graphene nanosheets by a hydrothermal method, thereby improving electronic conductivity and reducing volume changes of active material. Then, Li7P3S11 nanoparticles are coated on MoS5@10 %graphene via an in situ liquid-phase method, resulting in intimate interface contact between active material and electrolyte. The resultant all-solid-state lithium batteries based on MoS5@10 %graphene-15 %Li7P3S11 nanocomposite cathodes exhibit a high initial discharge capacity of 1030.1 mAh/g at 0.1 A/g and a reversible specific capacity of 570.7 mAh/g at 0.5 A/g after 500 cycles. Moreover, the obtained all-solid-state lithium battery using MoS5@10 %graphene-15 %Li7P3S11 cathode displays a high energy density of 493.0 Wh kg−1 at 0.1 A/g and a high power density of 470.3 W kg−1 at 1.0 A/g based on the total mass of cathode layer. The unique structure endows excellent electronic/ionic conductivities of active material and intimate interface contact in the cathode layer, enabling a stable all-solid-state lithium battery with good cycling stability and high energy density.