 In 1984, researchers at Bell Labs reported the synthesis and evaluation of a series of lithiated titanates.Of specific interest were the anatase form of titanium dioxide and the lithium spinel LiTi2O4  Anatase has been observed to have a maximum capacity of 150 mAh/g (0.5Li/Ti)with the capacity limited by the availability of crystallographic vacancies in the framework.The TiO2 polytype brookite has also been evaluated and found to be electrochemically active when produced as nanoparticles with a capacity approximately half that of anatase (0.25Li/Ti).