The XRD patterns of the RP-type phases can be well fitted with the tetragonal phase, and two orthorhombic phases. Compared to charged and discharged state, the cells cycled for 21 cycles shows similar values of lattice parameters than the discharged state for orthorhombic phase#1 (a~ 3.9550 Å, b~ 3.8290 Å, c~ 12.988(4) Å). For orthorhombic phase #2, a lattice parameter seems to increase slightly and the lattice parameters b, c stays similar. For the tetragonal phase, the most significant change is observed at the 21 st cycle, at which it seems to have a higher c lattice parameter together with an increased cell volume. These findings indicate that the reduced coulombic efficiency also is reflected in the changes of structure and composition in the discharged state.