In Situ Polymerized 1,3‐Dioxolane Electrolyte for Integrated Solid‐State Lithium Batteries

Solid‐state lithium batteries are promising and safe energy storage devices for mobile electronics and electric vehicles. In this work, we report a facile in situ polymerization of 1,3‐dioxolane electrolytes to fabricate integrated solid‐state lithium batteries. The in situ polymerization and formation of solid‐state dioxolane electrolytes on interconnected carbon nanotubes (CNTs) and active materials is the key to realizing a high‐performance battery with excellent interfacial contact among CNTs, active materials and electrolytes. Therefore, the electrodes could be tightly integrated into batteries through the CNTs and electrolyte. Electrons/ions enable full access to active materials in the whole electrode. Electrodes with a low resistance of 4.5 Ω □−1 and high lithium‐ion diffusion efficiency of 2.5×10−11 cm2 s−1 can significantly improve the electrochemical kinetics. Subsequently, the batteries demonstrated high energy density, amazing charge/discharge rate and long cycle life. The in situ polymerization of solid‐state dioxolane electrolytes on interconnected CNTs and active materials is the key to realize excellent interfacial contact. Electrons/ions enable full access to active materials in the whole electrode. Therefore, the integrated batteries demonstrated high energy density, amazing charge/discharge rate and long cycle life.