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4. Assessing the potential of ion beam analytical techniques for depth profiling Li in thin film Li ion batteries.

Author

Mathayan, Vairavel, Morita, Kenji, Tsuchiya, Bun, Ye, Rongbin, Baba, Mamoru, Moro, Marcos V., and Primetzhofer, Daniel

Subjects
LITHIUM-ion batteries, DEPTH profiling, THIN films, NUCLEAR reactions, PHOTODETECTORS, ION beams
Abstract

Depth resolution and probing depth for Li in lithium thin film batteries achievable using different ion beam analytical techniques were investigated. Experiments using protons for nuclear reaction analysis, He ions for time-of-flight (TOF) energy elastic recoil detection analysis (ERDA) in transmission geometry, as well as He and Li ions for coincidence ERDA in transmission geometry are performed. Experimental results are compared in terms of the obtained Li concentration in the separator layer. In coincidence ERDA experiments, significant loss of Li–Li and He–Li coincidence counts was observed due to multiple scattering of recoiled/scattered particles in the battery sample. The ideal achievable Li depth resolution was calculated for the ion beam techniques. A depth resolution of 750, 1030, 310, and 510 × 1015 atoms/cm2 could be achieved in the Nb2O5 cathode by nuclear reaction analysis (NRA) using 2 MeV H, TOF-ERDA using 8 MeV He, and coincidence ERDA using 8 MeV He and 8 MeV Li ions, respectively, upon optimization of the experimental setup. While a depth resolution of 120 × 1015 ions/cm2 could be achieved for Li by conventional TOF-ERDA using an solid-state detector energy detector and light primary ions such as O under gracing incidence, TOF-ERDA experiments are found to produce significantly higher beam damage in batteries than other techniques. The beam damage in NRA and coincidence ERDA as performed in this study is estimated to be of the order of 10−4 dpa. [ABSTRACT FROM AUTHOR]

Published
2021
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12. Effects of Polymeric Dielectric Morphology on Pentacene Morphology and Organic TFT Characteristics

Author

Ye Rongbin, Ohta Koji, and Baba Mamoru

Subjects
Engineering (General). Civil engineering (General), TA1-2040
Abstract

In this paper, we report on the effects of the polymeric dielectric morphology on pentacene morphology and organic thin film transistor (TFT) characteristics. The morphology and thickness of cyclo-olefin polymer (COP) dielectric could be controlled by selecting a solvent. Higher the solvent’s boiling point is, thinner and smother COP films could be obtained. Using the solvent of trimethylcyclohexane, the spin-coated COP films of ca. 330 nm with the peak-to-valley of 7.35 nm and the roughness of root mean square of 0.58 nm were obtained, and pentacene TFT showed high mobility of 2.0 cm2V-1s-1, which originated from highly ordering of pentacene thin films deposited on the smoother and thinner COP films.

Published
2016
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13. In-operando observation of Li depth distribution and Li transport in thin film Li ion batteries

Author

Mathayan, Vairavel, Moro, Marcos V., Morita, Kenji, Tsuchiya, Bun, Ye, Rongbin, Baba, Mamoru, Primetzhofer, Daniel, Mathayan, Vairavel, Moro, Marcos V., Morita, Kenji, Tsuchiya, Bun, Ye, Rongbin, Baba, Mamoru, and Primetzhofer, Daniel

Abstract

A quantitative assessment of Li transport is decisive for Li ion battery research. Here, we demonstrate in situ and in-operando depth profiling of the Li-inventory in lithium thin film batteries. We employ non-destructive coincidence elastic recoil detection analysis using different projectile ions in the MeV range to simultaneously quantify the lithium depth distribution in the whole stack with resolution better than 50nm by simulations of experimental data. Experiments were performed while charging and discharging the stack. 5MeV Li-7 primary ions were employed to extract the Li depth distribution in an similar to 3.6 mu m thick Ti/LMO/LIPON/NbO/Ti thin film battery. To show the versatility of the approach, a coincidence experiment was also performed using 4MeV He ions for an similar to 3.4 mu m thick Ti/LMO/LIPON/NbO/Ti battery. Our results illustrate, for example, lithium accumulation in the 90nm thick NbO layer upon charging with +3V. We could also show the transport of large amounts of Li from the LMO/LIPON interface to the LIPON/NbO interface upon overcharging with +5V. Altogether, these experiments demonstrate the potential of the employed technique, enabling in-operando high resolution composition depth profiling of Li and other light elements (e.g., H, He, C, N, and O) in ultrathin all-solid state batteries.

Published
2020
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