文摘
In order to develop a LISICON separator for an aqueous lithium-air battery, a thin membrane was prepared by a tape-casting of a Li1.3Al0.3Ti1.7 (PO4)3-AlPO4 based slip followed by a sintering step. By optimizing the grain sizes, the slip composition and the sintering treatment, the mechanical properties were improved and the membrane was reduced to a thickness of down to 40?¦Ìm. As a result, the ionic resistance is relatively low, around 38?¦¸ for a 55?¦Ìm membrane of 1?cm2. One side of the membrane was coated with a lithium oxynitrured phosphorous (LiPON) thin film to prevent lithium metal attack. Lithium metal was electrochemically deposited on the LiPON surface from a saturated aqueous solution of LiOH. However, the ionic resistance of the LiPON film, around 67?¦¸ for a 1.2?¦Ìm film of 1?cm2, still causes an important ohmic loss contribution which limits the power performance of a lithium-air battery.