Achieving High Energy Dual-Carbon Li-ion Capacitor with Unique Low- and High Temperature Performance from Spent Li-ion Batteries
Graphite, an ordered layered structure dominates as a stable electrode material since the commercialization of lithium-ion batteries (LIBs) which could increase a huge demand owing to the usage in forthcoming graphite-based energy storage devices. In this work, we propose an efficient route to reutilize the recovered graphite (RG) from spent LIBs as an anode material for the fabrication of a lithium-ion capacitor (LIC) after required treatment. It is found that the RG displayed a first excellent performance in the half-cell configuration and further encourages to assemble the full cell using activated carbon as a cathode. Prior to the fabrication of LIC, the RG is pre-lithiated (LiC6) to form a graphite intercalation compound to supply Li-ions. Thus, resultant dual-carbon LIC in aprotic organic solvent delivered a maximum energy density of 185.54 Wh kg―1 at a power density of 0.319 kW kg―1 in ambient conditions. Furthermore, different temperature performance analysis revealed that the assembled LIC presents a good cycling performance of continuous 2000 cycles with ~75% capacity retention at 10 and 25 ºC. The developed dual carbon-based LIC using recuperated RG from spent LIBs acquires promising features of low cost and applicability in wide temperature operations as well as providing a real solution to recycle the upcoming massive quantity of spent LIBs generated by different electronic appliances.