Electrochemical Characterization of Single Lithium-Ion Conducting Polymer Electrolytes Based on sp(3) Boron and Poly(ethylene glycol) Bridges
Por:
Guzman-Gonzalez, Gregorio, Avila-Paredes, Hugo J., Rivera, Ernesto, Gonzalez, Ignacio
Publicada:
12 sep 2018
Resumen:
A novel series of single lithium-ion conducting polymer electrolytes
(SLICPE) based on sp(3) boron and poly(ethylene glycol) (PEG) bridges is
presented, in the context of the development of a new generation of
batteries, with the aim to overcome the problems related to
concentration overpotential and low ion transport numbers in
conventional solid polymer electrolytes (SPE). The phase separation
generated by the physical mixture of SPE with plasticizers such as
poly(ethylene oxide) is still a serious problem. In this work, the use
of PEG with different chain lengths, for the polycondensation reaction
with LiB(OCH3)(4), to synthesize SLICPE allows preventing phase
separation while tuning the predominant conduction mechanism, and thus
the electrical properties, especially the lithium-ion transference
number. The ionic transport is promoted by chain mobility as the chain
length is increased. SLICPE with the best ionic conductivity values
(4.95 +/- 0.05) x 10(-6) S cm(-1) was the one synthesized from
poly(ethylene glycol) with an average M-N of 400 (BEG8), having an O/Li+
ratio of 20. The lithium transference number (t(Li)(+)) and
electrochemical stability window of SLICPE membranes at 25 degrees C
decreased as the PEG bridge length between sp3 boron atoms increased
from 0.97 to 0.88 and 5.4 to 4.2 V vs Li-0/Li+, respectively, for SLICPE
synthesized from PEG with an average M-N of 50-400 (BEGI to BEG8).
Filiaciones:
Guzman-Gonzalez, Gregorio:
Univ Autonoma Metropolitana Iztapalapa, Dept Ingn Proc & Hidraul, Av San Rafael Atlixco 186, Mexico City 09340, DF, Mexico
Univ Autonoma Metropolitana Iztapalapa, Dept Quim, Av San Rafael Atlixco 186, Mexico City 09340, DF, Mexico
Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
Avila-Paredes, Hugo J.:
Univ Autonoma Metropolitana Iztapalapa, Dept Ingn Proc & Hidraul, Av San Rafael Atlixco 186, Mexico City 09340, DF, Mexico
Rivera, Ernesto:
Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
Gonzalez, Ignacio:
Univ Autonoma Metropolitana Iztapalapa, Dept Quim, Av San Rafael Atlixco 186, Mexico City 09340, DF, Mexico
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