Nanoporous hybrid electrolytes
Schaefer, J.L.; Moganty, S.S.; Yanga, D.A.; Archer, L.A.
Oligomer-suspended SiO(2)-polyethylene glycol nanoparticles are studied as porous media electrolytes. At SiO(2) volume fractions, phi, bracketing a critical value phi(y) approximate to 0.29, the suspensions jam and their mechanical modulus increase by more than seven orders. For phi > phi(y), the mean pore diameter is close to the anion size, yet the ionic conductivity remains surprisingly high and can be understood, at all phi, using a simple effective medium model proposed by Maxwell. SiO(2)-polyethylene glycol hybrid electrolytes are also reported to manifest attractive electrochemical stability windows (0.3-6.3 V) and to reach a steady-state interfacial impedance when in contact with metallic lithium.
This work was supported by Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST), and by the National Science Foundation, Award No. DMR-1006323. JLN also acknowledges support from the Materials for a Sustainable Future IGERT program, NSF grant # DGE-0903653.
Royal Society of Chemistry
ROYAL SOC CHEMISTRY; THOMAS GRAHAM HOUSE; EFFECTIVE CONDUCTIVITY; ELECTRICAL-PROPERTIES; IONIC-LIQUID; PERFORMANCE; COPOLYMER; CATHODE; CELL
Previously Published As
J. Mater. Chem., 2011,21, 10094-10101