Page 457 - Handbook of Battery Materials

References 429

from doing this. One is that the contact area between the electrolyte phase and
the electrode phase (the electrochemical interface) is greatly increased. The other
is that the presence of the electrolyte material changes the thermal expansion
characteristics of the electrode structure so as to be closer to that of the pure
electrolyte. By doing so, the stresses that arise as the result of a difference in
the expansion coefficients of the two adjacent phases that can use mechanical
separation of the interface are reduced.
It is interesting to note that the recently announced Fujifilm development of
convertible oxide electrodes results in the formation of a microstructure containing
fine dispersions of both Li–Sn alloys and Li 2 O. The latter is known to be a
lithium-transporting solid electrolyte. Thus these electrodes can be thought of
as having a composite microstructure with an electrolyte as well as the reactant
phase.

14.12
What about the Future?

The recent development of the convertible oxide materials at Fuji Photo Film
Co. will surely cause much more attention to be given to alternative lithium alloy
negative electrode materials in the near future from both scientific and technological
standpoints. This work has shown that it may pay not only to consider different
known materials, but also to think about various strategies that might be used to
form attractive materials in situ inside the electrochemical cell.

References

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