Li-Cu/Li-Zn 3D Network Enhanced Composite Anodes for Solid-State Batteries

• 1、College of Aerospace Engineering, Chongqing University, Chongqing 400044

Abstract：Solid-state lithium metal batteries (SSLMBs) are considered as one of the most promising next-generation energy storage technologies due to their high energy density and good safety. However, their practical application is severely restricted by poor interface contact and lithium dendrite growth. To address these issues, this study designed a composite lithium anode based on the synergistic enhancement of a three-dimensional (3D) Li-Cu/Li-Zn framework. By introducing nano-copper powder and zinc foil into molten lithium, a composite lithium anode containing a 3D LiCu solid solution framework and LiZn/CuZn alloy phases was successfully prepared. The LiCu solid solution framework has high electronic conductivity and can effectively stabilize the anode structure and suppress volume changes. The LiZn and CuZn alloy phases significantly improved the interface wettability and provided nucleation sites for uniform lithium deposition. The interfacial impedance between the composite anode and LLZTO electrolyte was as low as 1.85 Ω cm2, and the critical current density (CCD) reached 1.2 mA cm?2. The symmetric cell could stably cycle for more than 500 hours at a high current density of 0.5 mA cm?2. The Li-Cu-Zn/LLZTO/LFP full cell maintained a capacity retention of 88.3% after 200 cycles at a rate of 1 C. This study provides a new idea for high-stability solid-state battery interface engineering and is of great significance to the development of high-safety and long-life solid-state energy storage devices.?????

Keywords： Solid-State Lithium Metal Battery LLZTO Composite Lithium Anode Interfacial Contact Dendrite Growth