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Suppressing the Self‐Discharge of Supercapacitors by Modifying Separators with an Ionic Polyelectrolyte
Author(s) -
Wang Haiyan,
Zhou Qinqin,
Yao Bowen,
Ma Hongyun,
Zhang Miao,
Li Chun,
Shi Gaoquan
Publication year - 2018
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201701547
Subject(s) - supercapacitor , polyelectrolyte , materials science , self discharge , cationic polymerization , chemical engineering , separator (oil production) , electrochemistry , diffusion , ionic bonding , cellulose , nanotechnology , ion , polymer , electrode , polymer chemistry , composite material , organic chemistry , electrolyte , chemistry , physics , engineering , thermodynamics
The application of supercapacitors for energy storage is severely limited by their self‐discharging behavior. Herein, a convenient technique is reported to effectively suppress the self‐discharge of typical activated carbon‐based supercapacitors by modifying their porous cellulose separators with a cationic polyelectrolyte, polyethyleneimine. Experimental and theoretical studies indicate that polyelectrolyte modification slows the ion diffusion driven by concentration gradient, while does not sacrifice the electrochemical performances of the supercapacitors.