- Byeon, Young-Woon;
- Yang, Sizhuo;
- Yang, Guang;
- Kim, Dong-Min;
- Avvaru, Venkata Sai;
- Ogunfunmi, Tofunmi;
- Scott, Mary;
- Helms, Brett A;
- Urban, Jeffrey;
- Kim, Haegyeom
A composite structure was developed for use in all-solid-state batteries that consists of a conductive 3D reduced graphene oxide framework embedded beneath cathode active material particles. This unique structure offers significant advantages when combined with a sulfide solid electrolyte as the heterogeneous distribution of the conductive carbon in the composite cathode ensures good contact between the carbon and cathode particles for facile electron transfer while a direct contact between the carbon and sulfide solid electrolyte is avoided or minimized. This approach assists in preventing or reducing unwanted irreversible faradaic reactions. As a result, the newly developed composite of cathode particles decorated on a 3D reduced graphene oxide framework delivers higher specific capacity with improved cycling stability compared with a typical composite cathode consisting of a homogenous mixture of the cathode active material, carbon nanofibers, and sulfide solid electrolyte.