Hongzan Song, Zhiqiang Luo, Hongchi Zhao, Shanshan Luo, Xiaojing Wu, Jungang Gao and Zhigang Wang

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Novel bionanocomposite ionogels consisting of an ionic liquid (IL) 1-ethyl-3-methylimidazolium acetate (EMIMAc), microcrystalline cellulose (MCC) and nano-silica (nano-SiO₂) particles with high tensile strength and high ionic conductivity have been successfully prepared. Dynamic light scattering (DLS) and transmission electron microscopy (TEM) measurements reveal a homogeneous dispersion of nano-SiO₂in the MCC/nano-SiO₂/EMIMAc bionanocomposite ionogels. In order to clarify the influences of added nano-SiO₂on the sol–gel transition process and liquid crystalline phase transition for the MCC/nano-SiO₂/EMIMAc systems, the complexes were investigated by dynamic rheological measurements, mechanical tensile property tests and polarized optical microscope (POM) observations. The rheological results indicate that the introduction of nano-SiO₂can induce and accelerate the gelation for the MCC/nano-SiO₂/EMIMAc solutions. By adjusting the MCC and nano-SiO₂concentrations, the gel-sol transition temperature and elastic modulus can be well controlled and the optimized values reach 125 °C and 7 × 10⁵Pa, respectively. The POM results reveal that the addition of nano-SiO₂significantly suppresses the liquid crystalline behavior of ionogels. A more significant result is that the bionanocomposite ionogels exhibit high ionic conductivity in the order of 10^?3S cm^?1at 30 °C. The ionic conductivity of the ionogels increases with increasing temperature and decreasing MCC concentration. The above results demonstrate that the novel bionanocomposite ionogels with high tensile strength are promising for the application as gel polymer electrolytes (GPE) in electrochemical devices.