Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
Publication date: 22nd December 2022
We report optimized electrochemical performance of a post-lithium energy storage constructed with cokes-derived activated carbon (CAC) and Li4Ti5O12/carbon nanotube (LTO/CNT) which have improved capacitance and rate capability, respectively. The improved capacitance of CAC is attributed to additional shallow intercalation due to remaining graphitic structure with ion adsorption via optimized surface area and pore structure. The graphitic structure is partially maintained via adjusted KOH activation condition. The LTO/CNT is synthesized using a spray-drying method in a one-pot synthesis where the Li-Ti-O/multiwall-CNTs are the initial precursors in the solution. The improved rate capability of LTO/CNT is affected by the increase in electronic conductivity, which entails the formation of an electron pathway via 3-D CNT network, whereas nano-sized LTO are embedded in CNT structure. The maximum energy and power densities of hybrid supercapacitor is 69.1 Wh kg–1 and 16.5 W kg–1, respectively, whereas the cycle-life performance is 88 % after 8,000 cycles. This study can allow for the expansion of post-lithium energy storage.
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