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Thin-Film Battery Applications

Thin-film rechargeable lithium batteries have numerous possible applications as active or standby power sources for microelectronics. Examples of active power sources include implantable medical devices, remote sensors, miniature transmitters, smart cards, and MEMS devices. Standby power applications include PCMCIA cards and other types of CMOS-SRAM memory devices.

Photographs of some of the prototype Li-LiCoO₂ thin-film batteries fabricated at ORNL. View (a) shows a cell with a 7.5-cm² active area for an implantable medical device. View (b) shows a battery with a 6.5-cm² active area fabricated on the backside of a multichip module package. This cell powers the circuit on the front side of the package shown in view (c). View (d) shows a typical experimental cell with a 1-cm² active area.

This figure illustrates how a thin-film battery can be integrated with a multichip module. A thin-film Li-LiCoO₂ battery was fabricated onto the back side of the ceramic package. Contact with the circuit on the front side was made by depositing the cathode and anode current collectors over gold-plated through-holes. The battery was designed to supply 150 µAh between 4.2 and 3.8 V at a low current.

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Date revised - 10/29/01 (njd)
 http://www.ssd.ornl.gov/BatteryWeb/Applications.html