A low temperature TiP2O7 polymorph exhibiting reversible insertion of lithium and sodium ions

Abstract

A new TiP₂O₇ form has been prepared by low temperature synthesis, which does not exhibit the superstructure reported when TiP₂O₇ is prepared via a conventional ceramic route. This LT-TiP₂O₇ polymorph presents linear P₂O₇ pyrophosphate groups, connected through a pivotal oxygen which ensure the flexibility of the structure. Therefore it can reversibly take up both Li and Na ions, contrary to the high temperature polymorph that can only take up Li.