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Stacked porous octahedral tin phosphate Sn2P2O7 nanodisks, with a thickness and a width of 20 nm and 200 nm, respectively, were prepared from quenching hydrothermally prepared (SnHPO4)2·H2O at 600 °C. The first discharge capacity was 600 mA h g−1 while the capacity retention, even after 220 cycles, was 93%.