Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/155768
Title: Mechanistic insights of Mg²⁺-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
Keywords: Science::Physics
Issue Date: 2021
Source: Wang, P., Xie, X., Xing, Z., Chen, X., Fang, G., Lu, B., Zhou, J., Liang, S. & Fan, H. J. (2021). Mechanistic insights of Mg²⁺-electrolyte additive for high-energy and long-life zinc-ion hybrid capacitors. Advanced Energy Materials, 11(30), 2101158-. https://dx.doi.org/10.1002/aenm.202101158
Project: RG157/19 
Journal: Advanced Energy Materials 
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.
URI: https://hdl.handle.net/10356/155768
ISSN: 1614-6832
DOI: 10.1002/aenm.202101158
Schools: School of Physical and Mathematical Sciences 
Rights: This is the peer reviewed version of the following article: Wang, P., Xie, X., Xing, Z., Chen, X., Fang, G., Lu, B., Zhou, J., Liang, S. & Fan, H. J. (2021). Mechanistic insights of Mg²⁺-electrolyte additive for high-energy and long-life zinc-ion hybrid capacitors. Advanced Energy Materials, 11(30), 2101158-, which has been published in final form at https://doi.org/10.1002/aenm.202101158. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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