Abstract
Titanium dioxide (TiO2) has been developed as a popular anode candidate beyond carbonaceous materials for potassium-ion batteries (PIBs). However, the serious lack of understanding of the electrolyte chemistry as well as the interfacial electrochemistry over TiO2-based materials during the K-storage process significantly limited their rational design as well K-storage applications. Herein, the K-storage performance of MOF-derived TiO2@C anode materials via optimizing structure and manipulating electrolyte chemistry was systematically investigated. A significantly improved K-storage performance was achieved in the optimized 4.0 M KFSI/EC+DEC electrolyte attributed to the formation of stable and thin SEI film induced by the unique solvation structures of the high concentrated electrolyte, which remarkably enhanced the K-storage kinetics via strengthening the pseudo-capacitive mechanism. These discoveries provide new insight into the electrolyte design principles for TiO2-based anode materials and will promote the development of advanced K-storage system for next-generation energy storage applications.
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