Characteristics of a new type of solid-state electrolyte with a LiPON interlayer for Li-ion thin film batteries

Title
Characteristics of a new type of solid-state electrolyte with a LiPON interlayer for Li-ion thin film batteries
Authors
지승현이만종안호상김동주최지원윤석진남상철김수호윤영수
Keywords
Ionic power device; Solid state electrolyte; Ionic conductivity; Li-P-W-O-N thin film; RF magnetron sputtering
Issue Date
2010-07
Publisher
Solid state ionics
Citation
VOL 181, NO 19-20, 902-906
Abstract
In this study, the feasibility of applying lithium phosphorous tungsten oxynitride (Li–P–W–O–N) thin films as solid-state electrolytes in solid-state ionic energy systems such as thin film batteries and super-capacitors was evaluated. The Li–P–W–O–N thin film electrolyte was prepared by radio frequency (RF) magnetron sputtering under various working pressures of nitrogen (N2) reactive gas. We propose that the LiPON/Li–P–W–O–N/LiPON structure makes it possible to use a Li–P–W–O–N thin film as a thin film solid electrolyte because of the potential short circuiting of the Li–P–W–O–Nthin film. To prepare the structure, a LiPONthin filmwas also deposited by RF magnetron sputtering onto Steel Us Stainless (SUS)/SiO2/Si. When a LiPON thin film interlayer was deposited on the sandwich structure of the Li–P–W–O–N thin film electrolyte, the current was less than 1μA. For the final cell structure of SUS/LiPON/Li–P–W–O–N/LiPON/SUS/SiO2/Si, impedance measurements conducted at room temperature revealed ionic conductivities in the range of 1.5–1.2×10−7 Scm−1 for the various deposition conditions of the Li–P–W–O–Nthin films. This result suggests that the LiPON/Li–P–W–O–N/LiPONstructured thin film electrolyte has potential as a solid oxide thin film electrolyte in solid-state ionic devices.
URI
http://pubs.kist.re.kr/handle/201004/37597
ISSN
0167-2738
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KIST Publication > Article
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