We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Mechanistic Insights of Mg<sup>2+</sup>‐Electrolyte Additive for High‐Energy and Long‐Life Zinc‐Ion Hybrid Capacitors.
- Authors
Wang, Pinji; Xie, Xuesong; Xing, Zhenyue; Chen, Xianhong; Fang, Guozhao; Lu, Bingan; Zhou, Jiang; Liang, Shuquan; Fan, Hong Jin
- Abstract
An electrolyte cation additive strategy provides a versatile route for developing high‐energy and long‐life aqueous zinc‐ion hybrid capacitors. However, the mechanisms of energy storage and Zn anode protection are still unclear in Zn‐based systems with dual‐ion electrolytes. Here, a dual charge storage mechanism for zinc‐ion hybrid capacitors with both cations and anions adsorption/desorption and the reversible formation of Zn4SO4(OH)6·xH2O enabled by the Mg2+ additive in the common aqueous ZnSO4 electrolyte are proposed. Theoretical calculations verify that the self‐healing electrostatic shield effect and the solvation‐sheath structure regulation rendered by the Mg2+ additive account for the observed uniform Zn deposition and dendrite suppression. As a result, an additional energy storage capacity of ≈50% compared to that in a pure 2 m ZnSO4 electrolyte and an extended cycle life with capacity retention of 98.7% after 10 000 cycles are achieved. This work highlights the effectiveness of electrolyte design for dual‐ion carrier storage mechanism in aqueous devices toward high energy density and long cycle life.
- Subjects
CAPACITORS; AQUEOUS electrolytes; ENERGY density; ENERGY storage; FLUOROETHYLENE; ADDITIVES; PLASMA sheaths; CHEMICAL-looping combustion
- Publication
Advanced Energy Materials, 2021, Vol 11, Issue 30, p1
- ISSN
1614-6832
- Publication type
Article
- DOI
10.1002/aenm.202101158