All solid-state battery is the ultimate destination of the development of lithium-ion battery due to its high safety and high energy density. However, solid electrolytes such as polymer, sulfide, and oxide face extreme challenges like hazard manufacturing, interfacial problems, battery assembly with high pressure, and so on. To overcome those problems aforementioned, composite solid electrolyte may use to prevent drawbacks. In addition, dry process in this composite electrode may also use to avoid solvent effects on while mixing solid electrolyte with cathode materials. Thus, the tortuosity and porosity of composite electrode should well control by the dry mixing process as well as further fabrications.
In this work, polysiloxane-based polyelectrolyte has been used to dry mix with NMC811 under a ratio of 50:50. With this optimum design, Fig. 1 shows the initial discharge capacity of this solid-state lithium metal battery is 198.5 mAh/g (CE: 67.8%). After the second cycle, the discharge capacity achieves to 272.1 mAh/g (CE: 98.8%) and no fading behavior in the cycling. The composite is designed with an area capacity of 3.5 mAh/cm2, which is closed to a commercialized use. With this dry process composite cathode design, solid-state battery is expected to service in near future.