Polycarbonate-based Solid Polymer Electrolytes for Li-ion Batteries

摘要: Pressing demands for high power and energy densities in novel electrical storage units have caused reconsiderations regarding both the choice of battery chemistry design. Practical concerns originating conventional use flammable liquid electrolytes renewed interests using solvent-free polymer (SPEs) as solid ionic conductors safer batteries.In this thesis work, SPEs developed from two host structures, polyethers polycarbonates, been investigated all-solid-state Li- Li-ion applications. In first part, functional polyether-based electrolytes, such poly(propylene glycol) triamine based oligomer oxide)-based acrylates, were 3D-microbattery The amine end-groups favorable forming conformal electrolyte coatings onto 3D electrodes via self-assembly. In-situ polymerization methods UV-initiated electro-initiated techniques also showed potential to deposit uniform with thicknesses down nano-dimensions.Moreover, poly(trimethylene carbonate) (PTMC), an alternative commonly polyether materials, was synthesized SPE applications promising functionality electrolyte. High-molecular-weight PTMC applied LiFePO4-based batteries. By incorporating oligomeric interfacial mediator, enhanced surface contacts at electrode/SPE interfaces obvious improvements initial capacities realized. addition, room-temperature PTMC-based explored through copolymerization e-caprolactone (CL) TMC. Stable cycling performance ambient temperatures confirmed P(TMC/CL)-based LiFePO4 half cells (e.g., around 80 150 mAh g-1 22 °C 40 under C/20 rate, respectively). Through functionalization, hydroxyl-capped demonstrated good adhesion metal oxides on non-planar electrodes. Ionic transport behavior polycarbonate-SPEs examined by experimental computational approaches. A coupling Li ion chain motions demonstrated.The final part work has focused exploring key characteristics PEO respectively. X-ray photoelectron spectroscopy (XPS) used get insights compositions interphase layers graphite cells.