期刊
THIN SOLID FILMS
卷 734, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2021.138838
关键词
Functional; Structural; Polyelectrolyte; Long cycle stability; Wide temperature range
类别
资金
- Natural Science Foundation of Shaanxi Province of China [2018JM5141]
- National Nature Science Foundation of China [21975169]
By employing the electrostatic attraction assembly strategy, a PSS/NiCo-LDH composite electrolyte with wide temperature range and excellent electrochemical cycle stability has been successfully synthesized. The addition of NiCo-LDH contributes to the enhanced thermal stability and accelerated migration rate of electrolyte ions. This work provides a novel approach for preparing polyelectrolytes with wide temperature range and long cycle stability for solid-state supercapacitor applications.
Although polyelectrolytes with good electrochemical compatibility have been widely used in all solid-state supercapacitors, the random dispersion of polymer chains results in a narrow operating temperature range, which limits its further application. Herein, through the electrostatic attraction assembly strategy, the negatively charged polystyrene sulfonic acid (PSS) and the positively charged layered nickel-cobalt double hydroxide (NiCoLDH) nanosheets are synthesized into PSS/NiCo-LDH composite electrolyte. Meanwhile, the polyelectrolyte shows a wide temperature application range (20-80 degrees C) and excellent electrochemical cycle stability in solid supercapacitor (capacitance retention rate reaches 96.2% after 5000 cycles) based on activated-carbon electrodes. The remarkable thermal stability and electrochemical performance are mainly attributed to the addition of NiCo-LDH, which is not only limit the thermal decomposition of PSS molecular chains, but also accelerate the migration rate of electrolyte ions. This work opens a way for the preparation of polyelectrolyte with wide temperature range and long cycle stability for application in solid-state supercapacitors.
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