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Hundred-micron-sized all-solid-state Li secondary battery arrays embedded in a Si substrate

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3 Author(s)
Kushida, K. ; College of Engineering and Research Center of Ion Beam Technology, Hosei University, Koganei, Tokyo  184-8584, Japan ; Kuriyama, K. ; Nozaki, T.

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Fabrication and charge/discharge behaviors of all-solid-state Li secondary battery arrays embedded into three Si trenches of 200×100 μm2 in area and 0.5∼2.0 μm in depth are presented. The battery arrays in a Si wafer, consisting of multiple layers (Al current collector/Li/SiO2–15 at. %P2O5/LiMn2O4/polycrystalline silicon current collector), are prepared by combining a sol-gel spin-coating method and Si very-large-scale integration technologies. Porous spin-on glass (SiO2–15 at. %P2O5) is adopted as an electrolyte layer, in which spatial paths for Li+ ions are artificially introduced into the glass. Each active battery area is isolated with double insulating walls (Si3N4/SiO2). The battery arrays demonstrate a constant capacity of ∼9.2 μA h cm-2 at ∼3.6 V up to 100 cycles. © 2002 American Institute of Physics.

Published in:

Applied Physics Letters  (Volume:81 ,  Issue: 26 )

Date of Publication:

Dec 2002

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