TY - JOUR
T1 - Lithium ion transport of solid electrolytes based on PEO/CF3SO3Li and aluminum carboxylate
AU - Zygadło-Monikowska, E.
AU - Florjańczyk, Z.
AU - Rogalska-Jońska, E.
AU - Werbanowska, A.
AU - Tomaszewska, A.
AU - Langwald, N.
AU - Golodnitsky, D.
AU - Peled, E.
AU - Kovarsky, R.
AU - Chung, S. H.
AU - Greenbaum, S. G.
N1 - Funding Information:
This work was supported in part by the Ministry of Science and Higher Education (3T08E01528 and N205080033) and in part by the European Community (NOE SES6-CT-2003-503532 Alistore). SHC is grateful for an Academic Release Time award and would like to acknowledge the assistance of Dr. K. Zick.
PY - 2007/11/15
Y1 - 2007/11/15
N2 - A homogeneous, composite polymer electrolyte (PE) containing poly(ethylene oxide) (PEO), CF3SO3Li and 33 wt.% of aluminum carboxylate [RC(O)OAlEt2]2 with an oligooxyethylene group R = CH2CH2C(O)O(CH2CH2O)nCH3 (n = 7) (AlCarb7), characterized by low glass transition temperature Tg = -51.4 °C was prepared. The interaction of aluminum carboxylate with various lithium salts was characterized on the basis of 27Al NMR spectroscopy in CDCl3 solutions. The bulk conductivity of solid PE with AlCarb7 is of the order of 10-5 S cm-1 at 60 °C and 10-4 S cm-1 at 90 °C. Electrochemical tests of Li|PE|Li cells showed a decrease in the RSEI with temperature, stabilizing at about 10 Ω cm-2. The lithium ion transference numbers determined by ac-dc polarization experiments range from 0.7 to 0.9. 7Li, 19F and 1H NMR spectra, the relaxation time and diffusion data were obtained. The calculated lithium transference number t+ at 50 °C is equal to 0.995, which suggests practically complete immobilization of the triflate salt anions. In the range of high temperatures (130-180 °C) t+ is equal 0.35-0.39. The dependence of t+ on temperature should probably be connected with the partial dissociation of the aluminum carboxylate and lithium salt complex.
AB - A homogeneous, composite polymer electrolyte (PE) containing poly(ethylene oxide) (PEO), CF3SO3Li and 33 wt.% of aluminum carboxylate [RC(O)OAlEt2]2 with an oligooxyethylene group R = CH2CH2C(O)O(CH2CH2O)nCH3 (n = 7) (AlCarb7), characterized by low glass transition temperature Tg = -51.4 °C was prepared. The interaction of aluminum carboxylate with various lithium salts was characterized on the basis of 27Al NMR spectroscopy in CDCl3 solutions. The bulk conductivity of solid PE with AlCarb7 is of the order of 10-5 S cm-1 at 60 °C and 10-4 S cm-1 at 90 °C. Electrochemical tests of Li|PE|Li cells showed a decrease in the RSEI with temperature, stabilizing at about 10 Ω cm-2. The lithium ion transference numbers determined by ac-dc polarization experiments range from 0.7 to 0.9. 7Li, 19F and 1H NMR spectra, the relaxation time and diffusion data were obtained. The calculated lithium transference number t+ at 50 °C is equal to 0.995, which suggests practically complete immobilization of the triflate salt anions. In the range of high temperatures (130-180 °C) t+ is equal 0.35-0.39. The dependence of t+ on temperature should probably be connected with the partial dissociation of the aluminum carboxylate and lithium salt complex.
KW - Aluminum carboxylates
KW - Lewis acid additives
KW - Lithium polymer electrolytes
KW - Lithium transference number
UR - http://www.scopus.com/inward/record.url?scp=35248816390&partnerID=8YFLogxK
U2 - 10.1016/j.jpowsour.2007.05.059
DO - 10.1016/j.jpowsour.2007.05.059
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
AN - SCOPUS:35248816390
VL - 173
SP - 734
EP - 742
JO - Journal of Power Sources
JF - Journal of Power Sources
SN - 0378-7753
IS - 2 SPEC. ISS.
ER -
