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Citation: LIU Wen-Yuan, LI Chi-Lin, FU Zheng-Wen. Stability of Lithium Phosphorous Oxynitride Thin Films in Humid Air[J]. Acta Physico-Chimica Sinica, ;2006, 22(11): 1413-1418. doi: 10.3866/PKU.WHXB20061121 shu

Stability of Lithium Phosphorous Oxynitride Thin Films in Humid Air

1.
Laser Chemistry Institute & Department of Chemistry, Fudan University, Shanghai 200433, P. R. China; Northwest Institute of Nuclear Technology, Xi′an 710024, P. R. China

Received Date: 20 May 2006
Available Online: 6 November 2006

Lithium phosphorus oxynitride (LiPON) thin films were prepared by radio frequency (RF) magnetron sputtering. The morphology, composition and electrochemical performance of LiPON electrolyte thin films placed in humid ambient were investigated using SEM, XRD and XPS, and electrochemical measurements of AC (alternating current) impedance and potential linear scanning, respectively. Obvious changes in surface morphology, composition and electrochemical properties were found for the as-deposited LiPON film placed in humid ambient with a relative humidity of 40% for 24 h. Results showed that the uniformity of the film surface became poor, the contents of phosphorous and nitrogen in LiPON film decreased due to its reaction with H2O, releasing gaseous PH3 and NH3. In addition, the formation of Li2CO3 obviously increased the contents of carbon and oxygen in LiPON film. Therefore, LiPON thin films placed in humid ambient resulted in a bad effect on its electrochemical performance such as the ionic conductivity and the electrochemical stability window.
- LiPON thin films;Thin film electrolyte;Magnetron sputtering;All-solid-state thin film lithium battery
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