Affiliation:
1. College of Chemistry and Chemical Engineering Shanghai University of Engineering Science Shanghai 201620 P. R. China
2. Institute for Superconducting and Electronic Materials (ISEM) Australian Institute for Innovative Materials (AIIM) University of Wollongong Wollongong NSW 2522 Australia
3. School of Chemical Engineering The University of Adelaide Adelaide SA 5005 Australia
Abstract
AbstractThe practical application of aqueous zinc‐ion batteries (AZIBs) is limited by serious side reactions, such as the hydrogen evolution reaction and Zn dendrite growth. Here, the study proposes a novel adoption of a biodegradable electrolyte additive, γ‐Valerolactone (GVL), with only 1 vol.% addition (GVL‐to‐H2O volume ratio) to enable a stable Zn metal anode. The combination of experimental characterizations and theoretical calculations verifies that the green GVL additive can competitively engage the solvated structure of Zn2+ via replacing a H2O molecule from [Zn(H2O)6]2+, which can efficiently reduce the reactivity of water and inhibit the subsequent side reactions. Additionally, GVL molecules are preferentially adsorbed on the surface of Zn to regulate the uniform Zn deposition and suppress the Zn dendrite growth. Consequently, the Zn anode exhibits boosted stability with ultralong cycle lifespan (over 3500 h) and high reversibility with 99.69% Coulombic efficiency. The Zn||MnO2 full batteries with ZnSO4‐GVL electrolyte show a high capacity of 219 mAh g−1 at 0.5 A g−1 and improved capacity retention of 78% after 550 cycles. This work provides inspiration on bio‐based electrolyte additives for aqueous battery chemistry and promotes the practical application of AZIBs.
Funder
Australian Research Council
Subject
General Materials Science,General Chemistry
Cited by
2 articles.
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