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Thin Film Lithium Ion Batteries for High Power Density Storage - Status and
Perspective
Stamate, Eugen; Christiansen, Ane Sælland
Publication date:
2013
Link to publication
Citation (APA):
Stamate, E., & Christiansen, A. S. (2013). Thin Film Lithium Ion Batteries for High Power Density Storage Status and Perspective. Abstract from 1st International Workshop on Solution Plasma and Molecular
Technologies, Tokyo, Japan.
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Thin Film Lithium Ion Batteries for High Power
Density Storage - Status and Perspective
Eugen Stamate1 and Ane Christiansen1
1
Department of Energy Conversion and Storage, Technical University of Denmark,
Frederiksborgvej 399, Roskilde 4000, Denmark
E-mail: [email protected]
Wireless and portable electronic devices enhanced drastically the speed and effectiveness
of information flow exchanged in our society. A common requirement for these devices is a
portable power source (battery) that needs to be compact, of low weight and of high power
density. Thus, improving the performance (capacity, lifetime and safety) and lowering the cost
of batteries is a critical goal under stringent need for development. Comparative to crystalline
electrolytes, thin film amorphous materials are the very promising candidates due to their
capability of single ion conduction, isotropic properties, and absence of grain boundaries. So
far there are two relevant materials used for electrolytes: Lipon and lithium thio-germanate.
Despite of extensive research, the mechanism to explain and control the ionic conductivity in
Lipon is not understood, while thio-germanate thin films are yet difficult to produce.
The aim of this work is to review the current status on Lithium ion batteries based on Lipon
electrolyte and present new results on Lipon thin films produced by RF sputtering.
Experiments are performed in a conventional RF sputtering system and also in a ECR plasma
assisted RF sputtering setup consisting of a matrix configuration of distributed plasma cells
placed at the top of a 40×40×40 cm vacuum chamber. The ECR cells can produce uniform
plasma in a pressure range from 10 down to 0.1 mTorr. A 2 inch magnetron sputtering
cathode is placed on the lateral side facing the head of a Hiden mass spectrometer. A
Langmuir probe and an optical fiber are inserted perpendicular to the direction of the mass
spectrometer and cathode as to measure plasma parameters and optical emission spectra. The
target made of Li3PO4 is provided by Kurt Lesker ®. Lipon films are deposited onto
Au-coated silicon substrates using different values for N2 flow and RF power in a controllable
nitrogen flow. Impedance spectroscopy, FIB-SEM and SEM are used for film
characterization.