Extremely pseudocapacitive interface engineered CoO@3D-NRGO hybrid anodes for high energy/ power density and ultralong life lithium-ion batteries

Although secondary Li-ion batteries are widely used for electrochemical energy storage, low energy (100-300 Wh kg(-1)) and power density (250-400 W kg(-1)) are limiting their applications in several areas including long-range electric vehicles. Herein, we demonstrate high energy (400 Wh kg(-1)) and power density (1 kW kg(-1)) Li-ion batteries (considering the weight of both electrodes) based on extremely pseudocapacitive interface engineered CoO@3D-NRGO hybrid anodes. These values are 2.8 and 2.3-fold higher respectively compared to graphite parallel to LiNiMnCoO2 full-cells under similar experimental conditions. Three-dimensional anode architecture presented here composed of ultrafine CoO nanoparticles (similar to 10 nm) chemically bonded to nitrogen-doped reduced graphene-oxide. This hybrid anode demonstrated excellent pseudocapacitance (similar to 92%), specific capacity (1429 mAh g(-1) @ 25 mA g(-1)), rate performance (906 mAh g(-1) @ 5 A g(-1)), and cycling stability (990 mAh g(-1) after 7500 cycles @ 5 A g(-1)). Outstanding electrochemical performance of CoO@3D-NRGO parallel to LiNiMnCoO2 full-cells is credited to the extreme pseudocapacitance of CoO@3D-NRGO anode resulting from Li2O/Co/NRGO nanointerfaces and Co-O-C bonds. The demonstrated strategy of interfacial engineering can also be extended for other environmental friendly/inexpensive transition metal oxide (Fe2O3, MnO2 etc.) anodes for high energy/power density and ultra-long-life Li-ion batteries. (C) 2020 Elsevier Ltd. All rights reserved.