➀ This study investigates the development of nano-ceramic electrolytes, particularly lithium indium chloride (Li3InCl6), to enhance the performance of solid-state lithium batteries (SSLBs). ➁ The research focuses on material design and processing to improve ionic conductivity and compatibility with electrodes. ➂ The study demonstrates high ionic conductivity of the synthesized Li3InCl6 and its potential for practical use in SSLBs.