Abstract
The first experiments of multi-layered Li-ion rechargeable batteries were carried out for developing a high-voltage and high-current solid-state power source. The thin-filmed battery, so-called twin-type one which is composed of two unit cells externally connected in parallel and in series could easily realize twice the total capacity and twice the total voltage of 6.5 V compared with those of its unit cell, respectively, although the battery is twice the operating area of the unit cell in this case. The other thin-filmed battery, so-called stacked-type one which is internally connected only in series could be well operated at least up to the high voltage of 5.5 V without any increase in its operating area. Experimental results obtained here suggest that the stacked-type battery composed of several thin-filmed cells can easily supply a high voltage more than 10 V for many types of portable electronic devices.
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