SDT TA instrument was used to analyze the thermal stability of different
SPE membranes under an argon atmosphere at a heating rate of 10 °C/min
from room temperature to 800 °C. A Nicolet IS50 spectrometer
was used to collect the FTIR spectra of SPE membranes. The activation
energy (Ea) was used to evaluate the Li+ transfer capability of SPE membranes, which involves Li+ dissociation and migration. A small Ea value implies a lower energy needed for Li+ transfer
through SPE membranes. Ea can be extracted
from the following equation: where σ, A, k, and T are the ionic conductivity,
pre-exponential factor, Boltzmann constant, and absolute temperature,
respectively.