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Wang, Hsien-Hau
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article
A room temperature rechargeable Li2O-based lithium-air battery enabled by a solid electrolyte
Abstract
<jats:p>A lithium-air battery based on lithium oxide (Li<jats:sub>2</jats:sub>O) formation can theoretically deliver an energy density that is comparable to that of gasoline. Lithium oxide formation involves a four-electron reaction that is more difficult to achieve than the one- and two-electron reaction processes that result in lithium superoxide (LiO<jats:sub>2</jats:sub>) and lithium peroxide (Li<jats:sub>2</jats:sub>O<jats:sub>2</jats:sub>), respectively. By using a composite polymer electrolyte based on Li<jats:sub>10</jats:sub>GeP<jats:sub>2</jats:sub>S<jats:sub>12</jats:sub>nanoparticles embedded in a modified polyethylene oxide polymer matrix, we found that Li<jats:sub>2</jats:sub>O is the main product in a room temperature solid-state lithium-air battery. The battery is rechargeable for 1000 cycles with a low polarization gap and can operate at high rates. The four-electron reaction is enabled by a mixed ion–electron-conducting discharge product and its interface with air.</jats:p>