The development of solid-state batteries (SSBs) represents a significant advancement in energy storage technology, addressing the limitations of traditional liquid electrolyte batteries, such as safety concerns and efficiency issues. However, SSBs face challenges including rigid solid-to-solid contacts, poor interfacial stability, and suboptimal performance across temperature ranges. This paper explores the role of nanotechnology in enhancing the performance and safety of SSBs. It highlights the applications of nanomaterials, such as nano-composites, nano-coatings, and embedded nanoparticles, which improve ionic conductivity, mechanical strength, and thermal management. The paper also discusses the challenges of commercializing nanotechnology in SSBs, including high production costs and regulatory hurdles. Despite these challenges, nanotechnology offers promising solutions for increasing the energy density and cycle life of SSBs, making them viable for applications in electric vehicles and consumer electronics. The paper concludes with recommendations for future research directions, emphasizing the need for continued innovation to fully realize the potential of SSBs in various industries.