Abstract: Solid-state battery technology, as a key frontier for next-generation energy storage systems, profoundly influences the global energy transition through its research and development dynamics and industry competition landscape. This study employs patent data to systematically compare the differentiated development pathways and competitive structures of solid-state battery technologies in China and Japan, including R&D activity, technological themes, competitive advantage, and market deployment. The findings indicate that Japan leverages early technological accumulation and persistent policy support, focusing on the research of sulfide and halide electrolytes to establish a high-energy-density technological framework. Its higher technological complexity and innovation index, along with widespread patent portfolio deployment, have created significant global technological barriers. Conversely, China relies on policy-driven and market-oriented dual-track development, achieving differentiated advantages particularly in semi-solid-state battery commercialization, composite electrolyte systems, and low-cost manufacturing processes. However, the proportion of high-innovation patents is insufficient, and the overseas technical market presence is weak. Based on these findings, this paper proposes an integrated strategy comprising four pillars: basic R&D innovation, patent system protection, technical standards leadership, and industrial ecosystem reconstruction. This strategy aims to provide data support and strategic recommendations for optimizing China’s solid-state battery technology breakthrough path.

Key words: Solid-state Battery; Solid Electrolyte; Patent Analysis; Sino-Japanese Competition; Polymer Electrolyte; Sulfide Electrolyte; Oxide Electrolyte; Composite Electrolyte