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Mingzhe Yu
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- Posted by Milton Bertrand
- October 4, 2014
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Abstract from Nature: With a high theoretical specific energy, the non-aqueous rechargeable lithium–oxygen battery is a promising next-generation energy storage technique. However, the large charging overpotential remains a challenge due to the... moreAbstract from Nature: With a high theoretical specific energy, the non-aqueous rechargeable lithium–oxygen battery is a promising next-generation energy storage technique. However, the large charging overpotential remains a challenge due to the difficulty in electrochemically oxidizing the insulating ​lithium peroxide. Recently, a redox shuttle has been introduced into the electrolyte to chemically oxidize ​lithium peroxide. Here, we report the use of a ​triiodide/iodide redox shuttle to couple a built-in dye-sensitized ​titanium dioxide photoelectrode with the oxygen electrode for the photoassisted charging of a lithium–oxygen battery. On charging under illumination, ​triiodide ions are generated on the photoelectrode, and subsequently oxidize ​lithium peroxide. Due to the contribution of the photovoltage, the charging overpotential is greatly reduced. The use of a redox shuttle to couple a photoelectrode and an oxygen electrode offers a unique... less
