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Abstract Portable society urgently calls for integrated energy supplies. This holds for autonomous devices but even more so for future medical implants. Evidently, rechargeable integrated all‐solid‐state batteries will play a key role in these fields, enabling miniaturization, preventing electrode degradation upon cycling and electrolyte leakage. Planar solid‐state thin film batteries are rapidly emerging but reveal several potential drawbacks, such as a relatively low energy density and the use of highly reactive lithium. Thin film Si‐intercalation electrodes covered with a solid‐state electrolyte are found to combine a high storage capacity of 3500 mAh g –1 with high cycle life, enabling to integrate batteries in Si. Based on the excellent intercalation chemistry of Si, a new 3D‐integrated all‐solid‐state battery concept is proposed. High aspect ratio cavities and features, etched in silicon, will yield large surface area batteries with anticipated energy density of about 5 mWh μm –1 cm –2 , i.e. more than 3 orders of magnitude higher than that of integrated capacitors.
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Peter H. L. Notten
F. Roozeboom
R.A.H. Niessen
Advanced Materials
Eindhoven University of Technology
Philips (Netherlands)
NXP (Netherlands)
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Notten et al. (Wed,) studied this question.
www.synapsesocial.com/papers/693759da4481bb54e4630826 — DOI: https://doi.org/10.1002/adma.200702398