Abstract
For rechargeable batteries, zinc chemistry presents a low-cost and potentially safer option than lithium and sodium. Those two metals typically use flammable organic electrolytes, while zinc is stable in air and compatible with water-based electrolytes. Now, scientists have developed a proof-of-concept, rechargeable zinc-ion battery that forgoes a thick anode, giving it a relatively high energy density ( Nano Lett. 2021, DOI: 10.1021/acs.nanolett.0c04519 ). Husam N. Alshareef and Yunpei Zhu of King Abdullah University of Science and Technology and Yi Cui of Stanford University preloaded the battery’s manganese oxide cathode with zinc ions and added zinc to the electrolyte instead of using a standard zinc anode. Without that excess zinc, the battery is lighter and can store more energy per unit weight. The resulting battery’s energy density was 135 W·h·kg –1, compared with 81 W·h·kg –1 for a more typical zinc-ion battery, in which the zinc anode contributes 20% of the
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