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Quicker and More Zn 2+ Storage Predominantly from the Interface
Author(s) -
Dai Yuhang,
Liao Xiaobin,
Yu Ruohan,
Li Jinghao,
Li Jiantao,
Tan Shuangshuang,
He Pan,
An Qinyou,
Wei Qiulong,
Chen Lineng,
Hong Xufeng,
Zhao Kangning,
Ren Yang,
Wu Jinsong,
Zhao Yan,
Mai Liqiang
Publication year - 2021
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202100359
Subject(s) - materials science , ion , graphene , cathode , oxide , energy storage , valence (chemistry) , nanotechnology , chemical physics , chemical engineering , chemistry , power (physics) , physics , organic chemistry , quantum mechanics , engineering , metallurgy
Aqueous zinc‐ion batteries are highly desirable for large‐scale energy storage because of their low cost and high‐level safety. However, achieving high energy and high power densities simultaneously is challenging. Herein, a VO x sub‐nanometer cluster/reduced graphene oxide (rGO) cathode material composed of interfacial VOC bonds is artificially constructed. Therein, a new mechanism is revealed, where Zn 2+ ions are predominantly stored at the interface between VO x and rGO, which causes anomalous valence changes compared to conventional mechanisms and exploits the storage ability of non‐energy‐storing active yet highly conductive rGO. Further, this interface‐dominated storage triggers decoupled transport of electrons/Zn 2+ ions, and the reversible destruction/reconstruction allows the interface to store more ions than the bulk. Finally, an ultrahigh rate capability (174.4 mAh g −1 at 100 A g −1 , i.e., capacity retention of 39.4% for a 1000‐fold increase in current density) and a high capacity (443 mAh g −1 at 100 mA g −1 , exceeding the theoretical capacities of each interfacial component) are achieved. Such interface‐dominated storage is an exciting way to build high‐energy‐ and high‐power‐density devices.