Center for Relativistic Laser Science

2019  124th KCS General Meeting

  There are many problems with current lithium-ion batteries that are discharged in unexpected cold due to climate change and in the polar regions. Although many groups are trying to improve the temperature range of LIB, studies have limitations since there is no exact understanding of the molecular level of LIB’s solvation system at the low temperature. To break through the current state, we are trying to get information about the change of the solvation structure of LIB at low temperature with a cryostat.

  We observed that the number of coordinated electrolytes(solvent) increases and the concentration of contact ion pair decreases as the temperature decreases. The number of coordinated electrolytes was calculated through analyzing C=O stretching of them and the trend of the CIP’s concentration was confirmed by investigating the P-F stretching of LiPF6(salt). We believe that the temperature dependence of the number of charge carriers has less effect on the temperature dependence of the conductivity than the mobility of charge carriers.