Electrochemical intercalation of Li into hexagonal- and pyrochlore-type cesium tungstates (CSyW1-y/6O3; y=0.3 and 0.5, respectively), and their bronzes (CsyWO3) derived from cesium peroxo-polytungstates was investigated in a 1MLiClO(4)/PC. Intercalation characteristics of those compounds are discussed in relation to their structures.