Abstract
In view of recent explosions of lithium ion batteries, it is important matter to make the safer and higher efficient lithium ion batteries. The polymeric electrolytes would likely to be important materials for solving these types of problems. In addition, the normal problem occurs for polysiloxane electrolyte is duo to their electrode contact ability property and without viscidity property.In this research, there are the novel three types of solid polymer electrolyte of the hydrophobic-hydrophilic modified siloxane being successfully prepared. We also discussed about the effect and relationship between the length of EO (ethyl oxide)side group and physical properties like electrode contact ability. As for the conductivities, the ionic conductivity of modified polysiloxane 3 could reach ca 1.15×10-4 S/cm at 25℃. We discussed about the electrochemically behavior and the EIS properties effect and relationship between the length of EO (ethyl oxide) side group at room temperature in this research. As expect, we also determined the free volume to the three types of polymer electrolytes and found the relationship between polymer structures which is EO dominated at room temperature and environmental temperature dependent. The battery performance of modified polysiloxane 3 is also assembled with LiCoO2 and LiFePO4 to a half cell testing. Furthermore, we discussedabout the possible ionic transfer behavior by PAS technique and the impedance properties effect and relationship between the length of EO (ethyl oxide) side groupand carbonate liquid electrolyte at room temperature. The impedance measurement had been confirmed the results from PAS and make its clear.