TY - JOUR
T1 - Synthesis and characterization of lithium-salt complexes with difluoroalkoxyborates for application as lithium electrolytes
AU - Zygadło-Monikowska, E.
AU - Florjańczyk, Z.
AU - Ostrowska, J.
AU - Tomaszewska, A.
AU - Bołtromiuk, P.
AU - Langwald, N.
AU - Golodnitsky, D.
AU - Peled, E.
N1 - Publisher Copyright:
© 2015 Elsevier Ltd.
PY - 2015/9/1
Y1 - 2015/9/1
N2 - We present a modified method for the synthesis of a Lewis acid of acidity lower than that of BF3: ROBF2, (where R is an oligooxyethylene substituent containing 1 to 7 ethylene oxide (EO) monomeric units). The synthesis consisted of thermal decomposition of trifluoroalkoxyborate salts under reduced pressure. The derivatives synthesized were applied in complexation reactions with low-molecular-weight lithium salts, such as LiF, LiI, LiPF6 CH3COOLi, CF3COOLi and (COOLi)2. The salts obtained show properties of ionic liquids at ambient temperature. On the basis of NMR, FTIR and EIS spectroscopy, the course of the complexation reaction has been proposed and the properties of the salts obtained have been determined. The system with CF3COOLi has the highest ambient-temperature ionic conductivity of the carboxylic complex salts studied (on the order of 10-4 S cm-1). The product of the reaction of CH3(OCH2CH2)2OBF2 and LiI, applied in a solid polymer electrolyte (10 mol% in PEO), was characterized by ionic conductivity of the order of 10-6 - 10-3 S cm-1 over a temperature range between 20 - 90 °C, and high lithium transference number (0.80 - 0.87).
AB - We present a modified method for the synthesis of a Lewis acid of acidity lower than that of BF3: ROBF2, (where R is an oligooxyethylene substituent containing 1 to 7 ethylene oxide (EO) monomeric units). The synthesis consisted of thermal decomposition of trifluoroalkoxyborate salts under reduced pressure. The derivatives synthesized were applied in complexation reactions with low-molecular-weight lithium salts, such as LiF, LiI, LiPF6 CH3COOLi, CF3COOLi and (COOLi)2. The salts obtained show properties of ionic liquids at ambient temperature. On the basis of NMR, FTIR and EIS spectroscopy, the course of the complexation reaction has been proposed and the properties of the salts obtained have been determined. The system with CF3COOLi has the highest ambient-temperature ionic conductivity of the carboxylic complex salts studied (on the order of 10-4 S cm-1). The product of the reaction of CH3(OCH2CH2)2OBF2 and LiI, applied in a solid polymer electrolyte (10 mol% in PEO), was characterized by ionic conductivity of the order of 10-6 - 10-3 S cm-1 over a temperature range between 20 - 90 °C, and high lithium transference number (0.80 - 0.87).
KW - Lithium borate salts
KW - ionic conductivity
KW - ionic liquids
KW - lithium transference number
KW - polymer electrolytes
UR - http://www.scopus.com/inward/record.url?scp=84939778481&partnerID=8YFLogxK
U2 - 10.1016/j.electacta.2015.03.019
DO - 10.1016/j.electacta.2015.03.019
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AN - SCOPUS:84939778481
SN - 0013-4686
VL - 175
SP - 104
EP - 112
JO - Electrochimica Acta
JF - Electrochimica Acta
M1 - 24545
ER -
