Polymer electrolyte/electrode interfaces

Kadiroglu, Umut (1999) Polymer electrolyte/electrode interfaces. University of Southampton, Doctoral Thesis.

Abstract

The performance of rechargeable batteries based on metallic or inserted lithium anodes is strongly dependent on the nature and properties of the interfacial layer formed between the electrode and electrolyte. In terms of cyclability of the lithium electrode, a through understanding of the behaviour and nature of this interfacial layer, stability in case of open circuit and cell charge/discharge conditions is important.

Amorphous form of the poly (ethyleneoxide) was synthesised to prepare a solid polymer electrolyte with lithium perchlorate salt. The thermal and electrochemical properties of the polymer and its electrolytes were investigated employing the differential scanning calorimetry (DSC) and ac impedance techniques.

The interfaces between the polymer electrolyte and Li_xWO₃ electrodes were examined in the symmetrical cells using the ac impedance technique. The investigations were carried out to explore the interfacial kinetics such as the charge transfer resistance and diffusion coefficient. The temperature, composition and salt concentration dependence of these parameters was examined. Compatibility of the polymer electrolyte in thin film cells within ITO thin film glass electrodes were examined. Li_0.1ITO/polymer electrolyte interface was also investigated.

A novel cell was developed to investigate the lithium metal/polymer electrolyte interface. The stability of the interface was investigated by the ac impedance. The effects of water on the planting/stripping cycling efficiency was examined using the galvanostatic technique. The effects of water on the interface was also investigated using the ac impedance, at different water concentrations.

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