Boosting Energy Storage via Confining Soluble Redox Species onto Solid–Liquid Interface

An upswell in the demand for both high energy density and large power density has triggered extensive research in developing next‐generation energy storage systems (ESSs), including redox‐enhanced electrochemical capacitors, metal–sulfur (LiS and NaS) batteries, and metal–iodine (LiI2, NaI2, etc...

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Bibliographic Details
Published in:Advanced energy materials 2021-02, Vol.11 (8), p.n/a
Main Authors: Sun, Shuo, Liu, Bo, Zhang, Hongshen, Guo, Qiubo, Xia, Qiuying, Zhai, Teng, Xia, Hui
Format: Article
Language:English
Subjects:
confinement
Electrode materials
Energy storage
Flux density
immobilization mechanisms
Iodine
Ion diffusion
Liquid-solid interfaces
Reaction kinetics
shuttle effect suppression
Sodium
Solid phases
solid–liquid interfacial manipulation
soluble redox species
Storage systems
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Summary:An upswell in the demand for both high energy density and large power density has triggered extensive research in developing next‐generation energy storage systems (ESSs), including redox‐enhanced electrochemical capacitors, metal–sulfur (LiS and NaS) batteries, and metal–iodine (LiI2, NaI2, etc.) batteries, which involve a liquid reaction pathway that decouples the reaction kinetics from the sluggish ion diffusion in the solid phase. Development is plagued at present by the shuttle effects of soluble redox species (SRSs) resulting in poor cycling stability and rapid self‐discharge. Based on the shuttle mechanisms of SRSs, it is crucial to build an atomic or molecular relationship between the electrode surface and SRSs, that is, solid–liquid interface. Here, a timely review of current advances towards the confinement of SRSs in ESSs through solid–liquid interfacial manipulation at the atomic/molecular level is presented. Particularly, the immobilization mechanisms of SRSs around electrode materials within a series of successful examples are highlighted. The corresponding promising research avenues and challenges via interfacial manipulations are also outlined. With this work as a background, new insights into promising strategies that effectively confine the SRSs around electrodes are discussed, with the aim to facilitate vertical leaps in the performance of next‐generation ESSs. Demand for energy‐dense electrochemical storage systems has drawn increasing focus to redox‐enhanced electrochemical capacitors and metal–iodine/sulfur batteries. This review details the manipulation of electrode–soluble redox species (SRSs), that is, a solid–liquid interface, at an atomic/molecular level for effectively confining SRSs (redox‐electrolytes, polysulfides, polyiodides, etc.) and boosting energy storage. Particular attention is paid to the working mechanisms behind advanced manipulation strategies.
ISSN:1614-6832
1614-6840
DOI:10.1002/aenm.202003599