Graphite/Li7P3S11 composite prepared by “seed” process for all-solid-state batteries

All-solid-state lithium batteries based on sulfide solid electrolytes have the potential to deliver the high safety and energy density required for applications such as electric vehicles. Here, a graphite/Li 7 P 3 S 11 composite was prepared by liquid-phase following a so-called “seed” process, in which Li 2 S coated on graphite was used as the “seed” for the direct formation of the Li 7 P 3 S 11 solid electrolyte on the surface of the graphite particles. An all-solid-state half-cell constructed using the prepared graphite/Li 7 P 3 S 11 composite exhibited a discharge capacity of 309 and 372 mAh g −1 at the C-rate of C/8 and at 25 °C and 100 °C, respectively. The electrochemical performance of the all-solid-state cell at different C-rates was evaluated at 100 °C. A relatively high discharge capacity of 168 mAh g −1 was retained at the high C-rate of 2C. • Li7P3S11 solid electrolyte coating on graphite by liquid-phase • Li7P3S11-coated graphite as anode material for all-solid-state lithium batteries • Li7P3S11/graphite composite prepared by liquid-phase with high c-rate capability