Stabilizing Zn Anodes by Molecular Interface Engineering with Amphiphilic Triblock Copolymer

被引：8

作者：

Chen, Xiujuan ^{[1
]}

Gao, Peiyuan

Li, Wei ^{[1
]}

Thieu, Nhat Anh ^{[1
]}

Grady, Zane M. ^{[2
]}

Akhmedov, Novruz G. ^{[3
,4
]}

Sierros, Konstantinos A. ^{[1
]}

Velayutham, Murugesan ^{[5
,6
]}

Khramtsov, Valery V. ^{[5
,6
]}

Reed, David M.

Li, Xiaolin ^{[2
]}

Liu, Xingbo ^{[1
]}

机构：

[1] West Virginia Univ, Benjamin M Statler Coll Engn & Mineral Resources, Dept Mech Mat & Aerosp Engn, Morgantown, WV 26506 USA

[2] Pacific Northwest Natl Lab, Energy & Environm Directorate, Richland, WA 99354 USA

[3] West Virginia Univ, C Eugene Bennett Dept Chem, Morgantown, WV 26506 USA

[4] Univ Oklahoma, Dept Chem & Biochem, 101 Stephenson Pkwy, Norman, OK 73019 USA

[5] West Virginia Univ, In Vivo Multifunct Magnet Resonance Ctr, Robert C Byrd Hlth Sci Ctr, Morgantown, WV 26506 USA

[6] West Virginia Univ, Sch Med, Dept Biochem & Mol Pharmacol, Morgantown, WV 26506 USA

来源：

ACS ENERGY LETTERS | 2024年 / 9卷 / 04期

关键词：

Additives - Block copolymers - Electrolytes - Hydrophobicity - Vanadium dioxide - Zinc;

D O I：

10.1021/acsenergylett.3c02824

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Aqueous Zn-based electrochemical technologies hold promise for large-scale energy storage applications, yet challenges persist in the unsatisfied Zn reversibility arising from an unstable Zn/electrolyte interface. Here, we employ molecular interface engineering using amphiphilic Pluronic triblock copolymers as electrolyte additives to stabilize the Zn anodes. With a balanced hydrophilic-hydrophobic nature, Pluronic F127 adsorbed on the Zn surface constructs a hydrodynamic interphase, where the hydrophobic PPO center shields the Zn surface from water-induced side reactions, while PEO side blocks guide the homogeneous Zn2+ redistribution. Additionally, F127 contributes to the Zn2+ solvation structure to weaken the water activity at the interfacial region. As a result, F127 additive enables cycling durability over 9300 and 3100 h at 1 and 5 mA cm(-2), respectively, and considerable cyclability with high-capacity retention across a wide current density range in Zn||VO2 full cells. This study highlights the potential of amphiphilic block copolymers in stabilizing metallic anode interfaces in aqueous electrolytes.

引用

页码：1654 / 1665

页数：12