The large-scale application of rechargeable batteries in electric vehicles and energy-storage systems is still hindered by their high cost, particularly from the active materials. Here we proposed a concept of integration of extraction-separation and materials-preparation to further reduce the materials' cost. The power of this concept was demonstrated by the large-scale room-temperature synthesis (150 g per batch) of multi-shelled Na₃(VOPO₄)₂F microspheres based on in situ generated bubbles as soft templates. The as-prepared Na₃(VOPO₄)₂F shows superior rate capability with discharge capacity of 81 mAh g⁻¹ at 15 C current rate and capacity retention of 70% after 3,000 cycles. Ex situ UV-vis was first employed to characterize the variation of oxidation state for vanadium during the charging and discharging process. This is the first report of a rapid and facile large-scale room-temperature controllable synthesis of Na₃(VOPO₄)₂F microspheres, and this approach could be extended to synthesize other similar compounds.

可充电电池在电动汽车和储能系统中的大规模应用仍然受到其高成本（尤其是活性材料）的高成本的阻碍。在这里，我们提出了提取分离与材料制备相结合的概念，以进一步降低材料成本。通过以原位产生的气泡作为软模板，对多壳Na ₃（VOPO ₄）₂ F微球进行大规模室温合成（每批150 g），证明了这一概念的强大功能。所制备的Na ₃（VOPO ₄）₂ F显示出优异的倍率能力，放电容量为81 mAh g ^-1在15 C的电流速率下进行3,000次循环后，容量保持率达到70％。易地的UV-vis首次使用时的充放电过程中表征为钒的氧化态的变化。这是Na ₃（VOPO ₄）₂ F微球的快速，简便，大规模的室温可控合成的首次报道，该方法可扩展为合成其他类似化合物。