Abstract:

Traditional liquid electrolytes fail to meet market demands in the rapidly advancing new energy vehicle industry. Solid electrolytes, boasting safety and energy density advantages, are the focus of future development. However, practical applications are hindered by inherent issues such as the poor interface performance of inorganic electrolytes and the low ion conductivity of polymer electrolyte materials. To address this, researchers have concentrated on composite solid electrolytes. These aim to combine the high ion conductivity and excellent mechanical properties of inorganic electrolytes with the flexibility of organic electrolytes that do not react with lithium metals. This study examines solid-state electrolyte trends for organic-inorganic composite lithium-ion batteries. It analyzes global and Chinese patent applications using Patsnap's database, comparing primary source countries and applicant status. The correlation between technical means and effects is also established. Patented technologies are analyzed across three dimensions: material composition (organic, inorganic, and additive), composite methods (physical blending, three-dimensional and multilayer composites), and specific preparation processes. The analysis indicates China's quantitative advantage in organic-inorganic composite solid-state electrolytes. However, applicants are dispersed, and technical protection mainly focuses on materials. Collaboration is recommended for comprehensive technical protection in upstream and downstream industries. Regarding technological direction, three-dimensional composite systems with a high inorganic phase content exhibit superior comprehensive performance. Moreover, from an industrialization perspective, polymer-filled inorganic particle systems may develop faster.

Key words: lithium-ion batteries, organic-inorganic composite, solid-state electrolyte, patent