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Highly Stretchable and Compressible Self‐Healing P(AA‐ co ‐AAm)/CoCl 2 Hydrogel Electrolyte for Flexible Supercapacitors
Author(s) -
Dai Lixin,
Zhang Wei,
Sun Lu,
Wang Xinghuo,
Jiang Wei,
Zhu Zewen,
Zhang Hengbin,
Yang Chuncai,
Tang Jun
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201801281
Subject(s) - electrolyte , supercapacitor , materials science , capacitance , hydrogen bond , ultimate tensile strength , chemical engineering , composite material , chemistry , electrode , molecule , organic chemistry , engineering
We report a novel tough self‐healing electrolyte on the basis of poly (acrylic acid‐ co ‐acrylamide) cross‐linked by divalent cobalt ions (Co 2+ ) (P(AA‐ co ‐AAm)/CoCl 2 ). Intermolecular and intramolecular hydrogen bonding work together with the metal‐coordination between Co 2+ and carboxylic ions to form a hydrogel, which can resist various deformations. The hydrogel electrolyte exhibits excellent mechanical performance (elongation at break >1200 %, compressive stress >600 kPa and compressibility >90 %). The established supercapacitor based on P(AA‐ co ‐AAm)/CoCl 2 can hold its capacitance even after bending, twisting, compressing and self‐healing. Moreover, it retains 90 % capacitance after 5000 cycles. Our electrolyte shows great prospects in manufacture of intelligent flexible equipment.