| Popis: |
Despite their low cost, safety, environmentally friendliness, and intrinsic non-flammable nature, the widespread application of aqueous rechargeable zinc-based batteries has been held back by their low coulombic efficiency and the notorious dendritic growth at the zinc-based anodes, along with the fast capacity fading of the cathodes. Herein, an aqueous Zn superbattery that consists of a mixed ZnCO3 MnCO3 grafted onto a graphene aerogel (ZMG) negative electrode and a nanotubular sulfidated Ni-Co-Fe layered double hydroxide (LDHS) positive electrode is reported. The alkaline ZMGLDHS superbattery delivers an excellent capacity and a superb rate capability (356 mA h g(cathode)(-1) (89 mA h g(total mass)(-1)) at 12 A g(-1); 108 mA h g(cathode)(-1) at 300 A g(-1)), extremely high specific energy and power (568 W h kg(cathode)(-1) or 15.8 mW h cm(-3), 429 kW kg(cathode)(-1) or 11.9 W cm(-3)), along with a high output voltage (1.8 V). The device also exhibits unprecedented cycling stability (99.2% capacity retention after 17,000 cycles at 100% depth of discharge) thanks to an electrochemical pulse-driven regenerative mechanism. |
Plný text