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A Flexible Aqueous Asymmetric Lithium‐Ion Supercapacitor with High Voltage and Superior Safety
Author(s) -
Liu Jie,
Hu Mengmeng,
Wang Jiaqi,
Wang Panpan,
Feng Yuping,
Wang Hua,
Cao Feng,
Chen Zuhuang,
Huang Yan
Publication year - 2019
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201900293
Subject(s) - supercapacitor , materials science , capacitance , electrolyte , energy storage , electrochemistry , power density , lithium (medication) , aqueous solution , nanotechnology , electrode , chemical engineering , chemistry , power (physics) , medicine , physics , quantum mechanics , engineering , endocrinology
Achieving high voltage and safety simultaneously in energy storage devices can greatly advance the development of flexible and wearable electronics. Thus, flexible aqueous asymmetric lithium‐ion supercapacitors with a high voltage attract the interest of many researchers. Herein, a new flexible aqueous asymmetric lithium‐ion supercapacitor with a high voltage and superior safety is fabricated using manganese oxide and iron hydroxide, which are electrodeposited on carbon cloths as electrodes and a super‐concentrated gel polymer as the electrolyte. Impressively, the flexible asymmetric lithium‐ion supercapacitor delivers a high voltage of 3.2 V, which is a high value in aqueous asymmetric supercapacitors. Moreover, the asymmetric supercapacitor exhibits a specific capacitance of 227.6 F g −1 , a maximum energy density of 49.3 Wh kg −1 , and a maximum power density of 11.5 kW kg −1 , together with a capacitance retention of 82% after 1000 cycles at a current density of 2 A g −1 . Importantly, the supercapacitor can keep good electrochemical performance under extremely harsh conditions, such as compressing, hammering, punching, and tailoring, which demonstrates superior safety.