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The monoclinic polymorph of Li 2 TiO 3  ( β -form) is known to be a relatively poor Li ion conductor. Up to now, no information is available on how the ion transport properties change when going from well-ordered crystalline Li 2 TiO 3  to a structurally disordered form with the same chemical composition. Here, we used high-energy ball milling to prepare nanocrystalline, defect-rich Li 2 TiO 3 ; ion dynamics have been studied  via  impedance spectroscopy. It turned out that ball milling offers the possibility to enhance long-range ion transport in the oxide by approximately 3 orders of magnitude. Its effect on the oxide ceramic is two-fold: besides the introduction of a large number of defects, the originally μm-sized crystallites are decreased to crystallites with a mean diameter of less than 50 nm. This process is accompanied by a mechanically induced phase transformation towards the  α -form of Li 2 TiO 3 ; besides that, a significant amount of amorphous materials is produced during milling. Structural disorder in nanocrystalline as well as amorphous Li 2 TiO 3  is anticipated to play the capital role in governing Li ion dynamics of the sample finally obtained.

Li Ion Dynamics in Nanocrystalline and Structurally Disordered Li 2 TiO 3