High-voltage operation of Li4Ti5O12/AC hybrid supercapacitor cell in carbonate and sulfone electrolytes: Gas generation and its characterization

Designing a hybrid supercapacitor, composed of Li4Ti5O12(LTO)/activated carbon (AC), is one of promising routes to enhance the energy density of supercapacitors (SCs) using symmetrical AC electrodes. At high-voltage operations (>3.0 V), however, the failure mode or gas generation is critical for the system, which is greatly dependent on the type of electrolyte. In this study, we investigated the voltage dependence of the interfacial phenomena of...