There are several types of solid electrolytes (SE) that can work as a medium for ionic (lithium ion) diffusion and as separators in SSBs. These types can be categorized into polymers, oxides, sulfides, hydrides, halides, borates, and thin films. SSBs are not sufficiently mature and still under development. Composite electrodes made of blends of active material (AM) and SE particles give the promise of SSBs with high energy density. Still, there are many issues to overcome. One issue is the limited contact surface area between AM and SE particles, which blocks the lithium ions from reaching the AM through SE. Another one is the short ionic and electronic percolation pathways within the domain of the composite electrode, which causes low conductivity and high resistivity throughout the system. Sulfide SEs are considered lithium superionic conductors because of their high conductivity (~10 -2 S cm - 1 ). Compared to oxide SEs, they offer better performance and more deformability, yet higher sensitivity to air and less (electro)chemical stability. They also undergo degradation in the presence of water to produce H2S gas. As a result, they can only be handled under an argon atmosphere. Chen et al. showed the stability of Li6PS5Cl in the dry room under oxygen, with minor conductivity losses due to carbonate formation. Even with the good deformability of the sulfide SE, there are still many complications in the manufacturing process. Difficulties in mixing, high air sensitivity and high temperature synthesis of the different components of the composite electrodes are the main issues facing the commercialization of SSBs. Thus, wet processes for the preparation of composite electrode films are preferred as a more feasible and scalable process for the manufacturing of the ASSB positive electrodes. However, inadequate attention has been paid in the past to the liquid chemistry of thiophosphates (main Li ion conducting components in sulfide SE). Currently, more research is being conducted on the liquid chemistry of sulfide SE. The liquid-phase processing of sulfide SE has more advantages in terms of time, synthesis temperature and scalability. More investigation and research are needed in order to facilitate scaling up the wet manufacturing process.