Two nanoscale Nb containing polyoxometalates based on {P2W15Nb3O62} clusters and chromium cations

Two novel mixed-addenda Nb/W polyoxometalates are successfully fabricated, and investigated as anode materials for lithium-ion batteries. For the Cs5K4{Cr3(H2O)12[P2W15Nb3O62]2}·60H2O sample, a reversible capacity (466.6 mA h g−1) and stable cycle performance are obtained.