Stable lithium electrodeposition in liquid and nanoporous solid electrolytes is crucial for the development of high-performance, safe, and cost-effective rechargeable batteries. This study investigates the stability of lithium electrodeposition in simple liquid electrolytes and in nanoporous solids infused with liquid electrolytes. The research highlights that simple liquid electrolytes reinforced with halogenated salt blends exhibit stable long-term cycling at room temperature, often with no signs of deposition instabilities over hundreds of cycles and thousands of operating hours. The findings are supported by surface energy data and impedance analysis of the electrolyte-lithium interface. The study also shows that the presence of lithium halide salts significantly enhances the surface mobility of lithium, which is important for the stability of lithium electrodeposition. The research demonstrates that adding lithium fluoride (LiF) to liquid electrolytes significantly improves the stability of lithium electrodeposition. LiF enhances the interfacial mobility of lithium ions, which reduces the likelihood of dendrite formation and short-circuiting. This improvement is observed in both liquid and nanoporous solid electrolytes. The study also shows that LiF-based electrolytes can achieve much longer cell lifetimes compared to traditional electrolytes, even at high current densities. The results indicate that LiF can effectively prevent dendrite growth and improve the stability of lithium metal batteries. The study also explores the use of nanoporous ceramic membranes infused with liquid electrolytes. These membranes provide a combination of solid-like mechanical modulus and liquid-like bulk and interfacial conductivities at room temperature. The results show that these electrolytes significantly increase the lifetime of cells cycled at low and moderate current densities. The study further demonstrates that LiF-based electrolytes can achieve a 100-fold enhancement in cell lifetime compared to control electrolytes at room temperature. The research also highlights the importance of understanding the electrochemical behavior of lithium metal electrodes in different electrolytes. The study shows that the addition of LiF to electrolytes significantly improves the stability of lithium electrodeposition, which is essential for the development of high-performance lithium metal batteries. The findings suggest that LiF can be used as an effective additive to stabilize lithium electrodeposition and prevent dendrite formation, which is a major challenge in the development of rechargeable lithium metal batteries. The study also emphasizes the importance of understanding the interfacial behavior of lithium ions in different electrolytes to improve the performance and safety of lithium metal batteries.Stable lithium electrodeposition in liquid and nanoporous solid electrolytes is crucial for the development of high-performance, safe, and cost-effective rechargeable batteries. This study investigates the stability of lithium electrodeposition in simple liquid electrolytes and in nanoporous solids infused with liquid electrolytes. The research highlights that simple liquid electrolytes reinforced with halogenated salt blends exhibit stable long-term cycling at room temperature, often with no signs of deposition instabilities over hundreds of cycles and thousands of operating hours. The findings are supported by surface energy data and impedance analysis of the electrolyte-lithium interface. The study also shows that the presence of lithium halide salts significantly enhances the surface mobility of lithium, which is important for the stability of lithium electrodeposition. The research demonstrates that adding lithium fluoride (LiF) to liquid electrolytes significantly improves the stability of lithium electrodeposition. LiF enhances the interfacial mobility of lithium ions, which reduces the likelihood of dendrite formation and short-circuiting. This improvement is observed in both liquid and nanoporous solid electrolytes. The study also shows that LiF-based electrolytes can achieve much longer cell lifetimes compared to traditional electrolytes, even at high current densities. The results indicate that LiF can effectively prevent dendrite growth and improve the stability of lithium metal batteries. The study also explores the use of nanoporous ceramic membranes infused with liquid electrolytes. These membranes provide a combination of solid-like mechanical modulus and liquid-like bulk and interfacial conductivities at room temperature. The results show that these electrolytes significantly increase the lifetime of cells cycled at low and moderate current densities. The study further demonstrates that LiF-based electrolytes can achieve a 100-fold enhancement in cell lifetime compared to control electrolytes at room temperature. The research also highlights the importance of understanding the electrochemical behavior of lithium metal electrodes in different electrolytes. The study shows that the addition of LiF to electrolytes significantly improves the stability of lithium electrodeposition, which is essential for the development of high-performance lithium metal batteries. The findings suggest that LiF can be used as an effective additive to stabilize lithium electrodeposition and prevent dendrite formation, which is a major challenge in the development of rechargeable lithium metal batteries. The study also emphasizes the importance of understanding the interfacial behavior of lithium ions in different electrolytes to improve the performance and safety of lithium metal batteries.