首页|A functional hydrogel electrolyte doped with graphene oxide enabling ultra-long lifespan zinc metal batteries by inducing oriented deposition

A functional hydrogel electrolyte doped with graphene oxide enabling ultra-long lifespan zinc metal batteries by inducing oriented deposition

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The progress of zinc(Zn)metal batteries(ZMBs)is greatly limited by poor cycling stability because of the mutual restrictions of dendrite growth,corrosion reactions,and passivation.In this work,an ultra-long lifespan(～7800 h),dendrite-free Zn metal anode is enabled via fabricating a functional hydrogel electrolyte out of polyacrylamide/graphene oxide(GO)/agarose(PGA)with a multifully cross-linked net-work.The synergetic integration of GO nanosheets and double-network structure endows the PGA hy-drogel electrolyte with high ionic conductivity and excellent mechanical performance.More importantly,the abundant hydrophilic groups and stable three-dimensional cross-linked network of PGA electrolyte effectively constrain Zn2+diffusion laterally along the Zn surface,which simultaneously prohibits water-induced corrosion and thus significantly enhances Zn anode reversibility.Both theoretical simulations and experiments reveal that the PGA electrolyte is capable of optimizing de-solvation kinetics and harmoniz-ing Zn2+flux at the electrolyte-electrode interface,ensuring uniform Zn2+deposition.Consequently,an ultra-long lifespan of 7800 h is achieved in the symmetric cell with the PGA electrolyte.Even at a high Zn utilization of 42.7％,it still delivers stable cycling over 1100 h.This work provides a practical and benefi-cial approach to dramatically extending the lifespan of the Zn anode and thus achieving high-performance ZMBs.

Zinc metal anodeHydrogel electrolyteGraphene oxideDouble-network structureUltra-long lifespan

Congyuan Wang、Jingjing Jiao、Jiaxuan Dai、Lu Yu、Qibing Chen、Xiangyu Xie、Xiaoping Yang、Gang Sui

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State Key Laboratory of Organic-Inorganic Composites,College of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China

National Key R&D Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

2020YFC191020051873011U1664251

2024

10.1016/j.jmst.2023.12.043

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.191(24)