Stereolithography Three-Dimensional Printing Solid Polymer Electrolytes For All-Solid-State Lithium Metal Batteries

Liquid-free all-solid-state lithium metal batteries (ASSLMBs) are promising candidates to meet the requirements of safety and high energy density for energy storages. However, poor interfacial contact is a major obstacle limiting their applications. Herein, we report a solid polymer electrolyte (SPE), originally prepared by stereolithography (SLA) three-dimensional (3D) printing for ASSLMBs. A 3D-Archimedean spiral structured SPE is rationally designed, which can shorten the Li-ion transport pathway from the electrolyte into the electrode, reinforce the interfacial adhesion, and improve the mass loading of active materials. The SLA printed SPE exhibits a high ionic conductivity of 3.7 x 10(-4) S cm(-1) at 25 degrees C. Furthermore, Li vertical bar 3D-SPE vertical bar LFP cells achieve reduced interfacial impedance and higher specific capacity of 128 mAh g(-1) after 250 cycles than those using structure-free SPE of 32 mAh g(-1). This work opens the great promise of SLA 3D printing technology to fabricate high-performance SPEs in ASSLMBs for next-generation energy storages.