Uncontrollable growth of lithium dendrite and its highly reactive surface are two key challenges in lithium metal batteries; they lead to poor cycling reversibility and safety. On the surface of Li metal anode, a passivation layer called solid electrolyte interface (SEI) plays a decisive role on its electrochemical behavior, and the fluorinating the SEI is important for successful passivation and reversible cycling of Li metal. This project explores vacuum deposited thin fluoropolymers as artificial SEI (ASEI) to improve the cycling reversibility of Li metal anode.
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Lithium ion batteries provide exceptional energy and power densities, but many challenges remain in the pursuit of safer, longer-life, lower-cost batteries. The aprotic liquid electrolyte in conventional cells is at the center of many of these challenges. This project seeks to transform conventionally passive separators into more active components that mitigate undesirable processes and side-reactions within the electrolyte. The project is also developing low-cost, scalable separator processing capabilities.
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To enable next-generation microelectronics, all-solid-state lithium thin film batteries (TFBs) are outstanding energy-dense solutions. These batteries are prepared through vacuum deposition and have total thickness of several micrometers. Our group has been developing high-capacity cathodes, both organic and inorganic materials, that don't require thermal annealing and allow incorporation into low-cost, flexible devices.
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