Bacterial Cellulose/Zwitterionic Dual-network Porous Gel Polymer Electrolytes with High Ionic Conductivity

Bacterial cellulose (BC) was innovatively combined with zwitterionic copolymer acrylamide and sulfobetaine methacrylic acid ester [P(AM-co-SBMA)] to build a dual-network porous structure gel polymer electrolytes (GPEs) with high ionic conductivity. The dual network structure BC/P(AM-co-SBMA) gels were formed by a simple one-step polymerization method. The results show that ionic conductivity of BC/P(AM-co-SBMA) GPEs at the room temperature are 3.2x10-2 S/cm @1 M H2SO4, 4.5x10-2 S/cm @4 M KOH, and 3.6x10-2 S/cm @1 M NaCl, respectively. Using active carbon (AC) as the electrodes, BC/P (AM-co-SBMA) GPEs as both separator and electrolyte matrix, and 4 M KOH as the electrolyte, a symmetric solid supercapacitors (SSC) (AC-GPE-KOH) was assembled and testified. The specific capacitance of AC electrode is 173 F/g and remains 95.0% of the initial value after 5 000 cycles and 86.2% after 10,000 cycles.