Affiliation:
1. College of Chemistry and Chemical Engineering Shanghai University of Engineering Science Shanghai 201620 P. R. China
2. School of Chemical Engineering University of Ulsan 93 Daehak-ro Nam-gu Ulsan 44610 Republic of Korea
3. School of Chemical Engineering The University of Adelaide Adelaide SA, 5005 Australia
Abstract
AbstractThe poor performance of Zn electrode in aqueous electrolytes prevents the practical application of aqueous zinc‐ion batteries (AZIBs). Here, 2‐Pyrrolidinone (Pr) is introduced into conventional ZnSO4 electrolytes as additive and only 3 vol.% addition (Pr−to−H2O volume ratio) enables boosted performance. The Pr molecules are preferentially adsorbed on the surface of Zn electrodes to promote the uniform deposition of Zn ions and modulate the solvation structure of Zn2+ to inhibit the side reactions. As a result, the Zn electrode is boosted to run over 1200 h during charge/discharge cycling processes and delivers high average coulombic efficiency (CE) of 99.9 % under 1 mA cm−2, 1 mAh cm−2. Even under harsh testing conditions of 20 mA cm−2 and 20 mAh cm−2, Zn electrode still run over 100 h, which is much longer than that at pristine electrolyte (25 h). Moreover, the Zn||MnO2 full cells with the Pr additive exhibit a high capacity of 201 mAh g−1 and good capacity retention of 89 % after 550 cycles at 0.5 A g−1.
Funder
Ministry of Higher Education and Scientific Research
Subject
Electrochemistry,Electrical and Electronic Engineering,Energy Engineering and Power Technology