Abstract
The electronic work function, w(e−), and the ionic work function, w(Li+), of a lithium ultraphosphate, Li0.67PO2.8, have been measured by thermionic emission in the Richardson–Dushman regime. The values derived are w(Li+) = 1.99 ± 0.18 eV and w(e−) = 2.64 ± 0.38 eV. The measurements have been made possible by the implementation of a micro-channel plate detector, allowing the counting of single charge carrier particles, equivalent to a detection limit on the order of 1 aA. The ionic work function is demonstrated to increase with increasing lithium content in a series of lithium phosphates.
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