A novel coronene//Na2Ti3O7 dual-ion battery

Here we construct a novel sodium dual-ion battery (Na-DIB) with a conventional alkyl/alkylene carbonate electrolyte by using reduced-graphene-oxide-coated Na2Ti3O7 (NTO@G) as the anode and coronene, a polycyclic aromatic hydrocarbon (PAH), as the cathode. The coronene//NTO@G configuration delivers a specific energy of 77Whkg−1, based on the total active mass in both electrodes, and excellent cycling stability with 80% capacity retention after 5000 cycles. In addition, this device can work well in a wide range of temperatures from −20 to 40°C. The results demonstrate a proof-of-concept Na-DIB that avoids the challenges of conventional dual-graphite DIBs by utilizing non-graphite intercalation anode and cathode, and a carbonate-based electrolyte without any additives. We report a new sodium dual ion battery (Na-DIB) with conventional alkyl carbonate electrolyte by using graphene coated Na2Ti3O7 as the anode and coronene, a polycyclic aromatic hydrocarbon, as the cathode. Benefiting from the novel nano-structural features and intercalation mechanisms, the Na-DIB demonstrates high energy density and long cycling life. [Display omitted] •A new dual-ion battery configuration with NTO@G anode and polycyclic aromatic hydrocarbon (PAH) cathode.•Moderate operating voltage at conventional alkyl carbonate electrolyte.•The record-long cycling life of dual-ion batteries.•Good electrochemical performance at different temperatures from −20 to 40°C.