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TitleElectrical insulation properties of RF-sputtered LiPON layers towards electrochemical stability of lithium batteries
Author(s)Vieira, E. M. F.
Ribeiro, J. F.
Silva, Maria Manuela
Barradas, N. P.
Alves, E.
Alves, A.
Correia, M. R.
Gonçalves, L. M.
KeywordsLithium battery
LiPON electrolyte
RF sputtering
Electrical insulation
Electrochemical stability
Issue date2016
PublisherIOP Publishing
JournalJournal of Physics D: Applied Physics
Abstract(s)Electrochemical stability, moderate ionic conductivity and low electronic conductivity make the lithium phosphorous oxynitride (LiPON) electrolyte suitable for micro and nanoscale lithium batteries. The electrical and electrochemical properties of thin-film electrolytes can seriously compromise full battery performance. Here, radio-frequency (RF)-sputtered LiPON thin films were fabricated in nitrogen plasma under different working pressure conditions. With a slight decrease in the deposition pressure from 6 to 1 × 10−3 mbar, the 600 nm thick LiPON film reveals an electric resistivity increase from 108 to 1010 Ω · cm, respectively. UV– micro-Raman spectroscopy confirms the nitrogen incorporation on the Li3PO4 material, while scanning electron microscopy, Rutherford backscattering spectrometry and nuclear reaction analysis show a well-defined compact structure with a composition of Li2.2PO2.2N0.6 for the higher electrical-resistivity film. An ionic conductivity close to 3 × 10−7 S cm−1 at room temperature (22 °C) was measured by AC impedance spectroscopy. Thermal properties were investigated through the differential scanning calorimetry technique. LiPON films reveal high optical transmission (>75%) in the UV–vis range, which could be interesting for transparent electronic devices.
Publisher version
AccessRestricted access (UMinho)
Appears in Collections:DEI - Artigos em revistas internacionais

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