New titanium (III) phosphite structure and its application as anode for lithium ion batteries

Abstract A new titanium (III) phosphite Ti 2 (HPO 3 ) 3 , has been synthesized under hydrothermal conditions. The solid-state structure of this material was solved using single-crystal X-ray diffraction. The anionic inorganic skeleton has a three-dimensional structure, which is built up by TiO 6 octahedral units linked together via bridging HPO 3 pseudo pyramids, giving rise to tunnels along the three crystallographic axes. This new compound displays a high thermal stability limit of 625 °C. IR and Raman spectroscopies show the vibrational modes of the (HPO 3 ) 2− oxoanions. Electrochemical activity of this phase toward reversible insertion of Li ion was studied for the first time by galvanostatic charge-discharge measurements, an insertion host for reversible accommodation of Li + was observed.