Electrochemical Studies on Cellulose Acetate-LiBOB Polymer Gel Electrolytes

摘要

Liquid electrolytes were prepared by dissolving different amounts of lithium bis(oxalato) borate (LiBOB) in y-butyrolactone (GBL) solvents. Upon addition of 0.8 M LiBOB in GBL solvent, this liquid electrolyte showed room temperature ionic conductivity of 4.79 mS cm~(-1). In order to prepare polymer gel electrolytes (PGE), 1 to 6 wt.% cellulose acetate (CA) was added into this optimum liquid electrolyte composition. The highest room temperature conductivity obtained for the PGE system was 5.36 mS cm~(-10 for sample containing 2 wt.% CA. Temperature dependent conductivity data revealed the CA-LiBOB polymer gel electrolyte obeys an Arrhenius rule implying that this PGE could operate at intermediate and high temperature conditions. Moreover, linear sweep voltammetry (LSV) and cyclic voltammetry (CV) measurements confirmed this PGE system also exhibits excellent electrochemical stability. Thus, the CA-LiBOB-based PGE could be a promising candidate as an electrolyte particularly in lithium batteries application.