Slide 1
Highly Conductive Solid-State Polymer Electrolyte Membrane for
High Temperature OperationsThein Kyu, University of Akron, DMR
1161070The highlights of the solid-state lithium ion polymer
electrolyte membrane thus developed are:
Ease of fabrication via photopolymerization at room temperature
without requiring any solvent Flexible and stretchable including
outstanding bendability and twistability without forming any
creases, thereby affording design flexibility like cable wires or
films with space saving attributesExcellent ionic conductivity
comparable to those of conventional liquid electrolytes in the
range of superionic conductors (i.e., 10-3 S/cm at room
temperature)Excellent thermal stability up to 140 oC, which is
significantly improved relative to 80 oC of the current liquid
electrolyte battery technologyExhibits self-extinguishability and
flame retardancyElectrochemically stable against LiFePO4 cathode
and Li4Ti5O12 anode in half-cell testsAlleviate fire hazard and
environmentally benign.
T. Kyu and M. Echeverri, Highly conductive, completely amorphous
lithium ion polymer electrolyte membranes, US Patent Application:
Univ. of Akron; (2012), pending.
M. Echeverri, C. Hamad, and T. Kyu, Highly Conductive,
Completely Amorphous Polymer Electrolyte Membranes Fabricated
Through Photo-polymerization of Poly(ethylene glycol diacrylate)
Containing Solid Plasticizer and Ionic Salt Mixtures, Solid State
Ionics, 254, 92100 (2014)
Fig. 1. Solid-state polymer electrolyte membrane (PEM) (20/40/40
PEGDA/SCN/LiTFSI), showing (a) very high ionic conductivity and
reproducibility during heating and cooling cycles up to 150 oC and
(b) electrochemical stability up to 4.3 volts against Li
electrode.
2.42.62.83.03.23.41E-41E-30.01Ionic conductivity (S/cm)1000/T
(K-1) 1st heating 1st cooling 2nd
heating16014012010080604020Temperature (C)Tc=36CTm=49C1Broader
Impact: All participating students received interdisciplinary
research training covering polymer materials synthesis and
characterization, physical chemistry, electrochemistry, battery
engineering and design.Training: Ms. Cosset Hamad (freshman)
received undergraduate research training in Fall 2013, Spring and
Summer 2014. Mr. Camilo Piedrahita, University of Antioquia,
Colombia, received undergraduate internship in Spring 2014. Mr.
Jinwei Cao graduated with M.S. in Polymer Engineering in May 2014
and now advance to Ph. D. program at the University of Akron.
Collaboration: Started collaboration with Professor Yu Zhu (Polymer
Science, University of Akron) for development of vertically aligned
carbon nanotube (CNT) anode and with Professors Tsukahara and
Adachi, Kyoto Institute of Technology, on surface modification of
CNT anodes by grafting poly(ethylene glycol) and poly(dimethyl
siloxane) via anionic polymerization.
Fig. 2: (a) Conventional liquid electrolyte battery showing
combustion of a labtop versus (b) our solid-state polymer lithium
ion membrane showing bendability, twistability, stretchability,
thermal stability, self-extinguishability and flame retardant
behavior.
Highly Conductive Solid-State Polymer Electrolyte Membrane for
High Temperature OperationsThein Kyu, University of Akron, DMR
1161070
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