Change of the oxidation state of phosphorus in sputtered Li3±xPO4±y and Li3±xPO4±yNz films |
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Authors: | P Birke W Weppner |
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Institution: | (1) Chair for Sensors and Solid State Ionics, Christian Albrechts-University, D-24143 Kiel, Germany |
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Abstract: | Thin Li3±xPO4±yNzLi+- electrolyte films prepared by reactive rf-magnetron sputtering of Li3PO4 incorporate a certain amount of nitrogen which is made responsible for increased Li+-conductivity as well as at least kinetic stability with lithium metal. A possible change of the oxidation state +5 of phosphorus
as a result of the sputter process has not yet been considered for explanation. We have found out that it cannot be generally
assumed that reactive low power rf-magnetron sputtering of Li3PO4 results in fully oxidized films, even when pure O2 is employed as sputtering gas. Our films immediately react with H2O releasing a garlic smelling gas. The reaction area is surrounded by a white crust afterwards. CuSO4 and AgNO3 aqueous solutions become reduced. Impedance measurements yield an ionic conductivity of 2·10−6 S/cm at 25 °C and an activation energy of 0.62 eV. |
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