Shi, Tianyi; (2025) Exploring of the Role of Ionic Liquids and Electrolyte Additives on the Electrochemical Performance of Potassium-Ion Batteries. Doctoral thesis (Ph.D), UCL (University College London).

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Abstract

This study examines the possibility of potassium-ion batteries (PIBs) as alternatives to lithium-ion batteries (LIBS), with a focus on the effectiveness of ionic liquids as safe electrolytes and as additives to carbonate electrolytes, in comparison to traditional carbonate-based electrolyte designs. The long-term performances of various electrolyte designs are compared to evaluate the reliability of different electrolytes for extended cycling of traditional Graphite anode and 3,4,9,10-perylene-tetracarboxylicdianhydride (PTCDA) cathode materials. The degradation of a specific electrolyte for a given graphite electrode in potassium-ion batteries is analyzed through capacity failure analysis of the materials and interfaces. The accumulation of the key nanoscale solid-electrolyte interface (SEI) on graphite electrodes is primarily analyzed through surface analysis methods, mainly X-ray Photoelectron Spectroscopy (XPS). Through capacity failure analysis, we can understand the correlation between a stable SEI layer and extended cycling life of graphite in potassium-ion batteries. Furthermore, the electrolytes were tested with the PTCDA electrode to verify the integrity of the electrolyte design. In general, the electrochemical and failure analysis can offer guidelines for selecting suitable electrolytes for to enhance long-term performance of conventional electrodes in potassium-ion batteries.

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