Driven by the constant demands for miniaturizing electronic
devices such as complementary metal-oxide semiconductor backups,
smart cards, implantable medical devices, and MEMS, great
efforts are being directed toward designing and fabricating allsolid-
state thin-film lithium batteries with their potential in advantageously
offering ultrathin forms, with shape flexibility, lightness,
innoxiousness, and non-susceptibility to corrosion and
explosion. Together with this, they afford high energy-density,
good cycling performance, and they readily withstanding exposure
to high temperature and high pressure. In all these features,
they differ markedly from the traditional coin-, cylindrical- or
prismatic-type cell configurations. The research of all-solid-state
thin film lithium batteries (TFBs) is also quite different from that
of the traditional lithium batteries, for instance, the interface between
the electrode and solid-state electrolyte is quite different
from the SEI (Solid Electrolyte Interface) layer in lithium batteries,
which has much more impact to the TFB’s performance compare
with SEI to lithium batteries. In this review, we summarily discussed
the many more choices of materials that might serve as the
positive and negative thin-film electrodes for thin-film battery
components (Fig. 20). Up to now, the best electrode choices for allsolid-
state thin film batteries are considered as LiCoO2 (LiMn2O4 or
LiFeWO4) for cathode and Li for anode. During them, in our opinion,
LiFeWO4/Li cell is the most promising one due to its considerable
performance and low temperature synthesis. The next key issues to
be addressed concern the needs for a high-quality electrolyte/
electrode interface and the large storage lithium capacity of thinfilm
electrode; only then we can realize practical high performance
all-solid-state rechargeable batteries for daily use.