LAUSR

Here, we report the rechargeable aqueous battery of Zn/K0.17MnO2 with multiple metal ions in the electrolyte based on K0.17MnO2 as the cathode and zinc as the anode. The microspheres of broccoli-like K0.17MnO2 made up of large rod particles with a size of about 200 nm in diameter are synthesized by hydrothermal method followed by calcination at 500 °C in air for 2 h. The cyclic voltammetry measurement demonstrates that it is easy to intercalate into the cathode for zinc ions with smaller radius compared with potassium ions. The galvanostatic charge/discharge test displays that it delivers the initial discharge capacity of 189.3 mAh g−1 at 100 mA g−1 after adding 0.05 mol L−1 MnSO4 into the hybrid electrolyte. Meanwhile, the discharge capacity retains still up to 78.4 mAh g−1 at a current density of 3200 mA g−1, indicating the much better cycle stability than that without additive and the superfast ion transport characteristic.