LISICON is an acronym for LIthium Super Ionic CONductor, which refers to a family of solids with the chemical formula Li2+2xZn1−xGeO4. LISICON compounds have relatively high ionic conductivities, on the order of 10−6 S/cm, which are caused by hopping of Li ions among interstitial sites of the LISICON crystal lattice. The conductivities are almost 100 times higher in thio-LISICONs, where oxygen is replaced by sulfur. LISICONs are used as solid electrolytes in batteries, such as nickel–lithium battery.
LISICONs readily react with lithium metal and atmopsheric gases such as CO2; as a result, their conductivity decreases with time.
LISICONs should not be confused with NASICONs – these two classes of superionic conductors have similar acronyms, but very different chemical structures.