An Aqueous Zinc‐Ion Battery Based on Copper Hexacyanoferrate

作者：Rafael Trócoli, Fabio La Mantia · 发表于：ChemSusChem · 年份：2014 · DOI：10.1002/cssc.201403143 · 被引用次数：740 · 研究领域：Advanced battery technologies research、Advancements in Battery Materials、Advanced Battery Materials and Technologies

A new zinc-ion battery based on copper hexacyanoferrate and zinc foil in a 20 mM solution of zinc sulfate, which is a nontoxic and noncorrosive electrolyte, at pH 6 is reported. The voltage of this novel battery system is as high as 1.73 V. The system shows cyclability, rate capability, and specific energy values near to those of lithium-ion organic batteries based on Li4 Ti5 O12 and LiFePO4 at 10 C. The effects of Zn(2+) intercalation and H2 evolution on the performance of the battery are discussed in detail. In particular, it has been observed that hydrogen evolution can cause a shift in pH near the surface of the zinc electrode, and favor the stabilization of zinc oxide, which decreases the performance of the battery. This mechanism is hindered when the surface of zinc becomes rougher.