High performances of all‐solid‐state battery with designed composite cathode: An effect of conductive binders with single‐walled carbon nanotube additives

We designed a composite cathode with a conductive binder (CB) including single-walled carbon nanotubes (SWCNTs) in an all-solid-state battery. We found that the optimal amount of SWCNTs was 3.0% of that in the binder and the electrical conductivity of the CB was 9.06 S cm−1. We investigated the cell to identify how SWCNTs affect electrochemical performances. The composite cathode with 2.4 mhA cm−2 of high areal capacity exhibited 93.4% of utilization and 94.0% of capacity retention after 50 cycles at 0.5 C under 60°C. Moreover, it performed 80% of the outstanding rate capability at 7.0 C compared to 0.2 C.