This shows a higher mechanical flexibility and a lower interface resistance than the ceramic solid electrolyte [20,21].
Furthermore, we report on a composite electrolyte formed by mixing LTAPO pellets with an organic
liquid electrolyte [22]. The composite electrolytes decrease the instability of a solid-on-solid
interface, which is induced by the volume change of the electrode materials during lithium ion
insertion/extraction. However, the electrochemical properties are still lower than those of the
liquid electrolyte lithium battery [23, 24]. This may be because ionic conductivity is not
sufficient to allow
high capacity.