POS6-0860
Polyampholyte methylcellulose incorporating lithium chloride as a high performance quasi-solid polymer electrolyte for supercapacitors with high rate capability
When and Where
Nov 30, -0001
12:00am - 12:00am
Presenter(s)
jin haewon (hannam university)
Co-Author(s)
Abstract
Quasi-solid polymer electrolytes are receiving immense interest in the field of energy storage as a safer and more stable substitute to the conventional liquid electrolytes. However, designing high-performance quasi-solid electrolytes for supercapacitors remains particularly challenging, as poor ionic conductivity and interfacial contact can severely limit the rate capability and cycle life—two defining characteristics of supercapacitors. Herein, a high-performance quasi solid polyampholyte electrolyte is synthesized via the chemical functionalization of methylcellulose (PAMC). Upon the addition of lithium chloride (LiCl), this novel cellulosic electrolyte can exhibit an exceptionally high ionic conductivity of 59.77 mS cm-1. This outstanding performance is attributed to the high salt-loading capacity of the PAMC and a salt-induced structural evolution that reduces crystallinity of the electrolyte. Furthermore, the electrolyte maintains robust ion transport even at an extreme temperature of -60 oC and during severe bending. Notably, solid-state electric double layer capacitors (EDLCs) fabricated with the 20 wt% LiCl-PAMC exhibit superb rate capability that outperform similar devices fabricated with 2 M LiCl aqueous electrolyte, a result ascribable to excellent adhesive property of LiCl-PAMC. Finally, the 20 wt% LiCl-PAMC EDLC demonstrates outstanding cyclic stability of 14,600 cycles, underscoring its immense potential for next-generation high-power energy storage applications.
