(198c) Hierarchical NiCo2O4 Nanosheets on Carbon Nanofiber Films for High Energy Density and Long-Life Li-O2 Batteries
Herein, we propose a novel structure of hierarchical NiCo2O4 nanosheets on porous carbon nanofiber films (denoted as NiCo2O4@CNFs), for high energy density and long-life Li-O2 batteries. The nanostructured cathode integrates several desirable design rationales for high-performance Li-O2 batteries based on low-dimensional ultrathin nanosheets, lightweight conductive carbon networks, and a binder-free cathode. With the help of this rational design, the NiCo2O4@CNFs cathode exhibits excellent electrochemical performance including a high specific discharge capacity of 4179 mA h gâ1, excellent energy density of 2110 Wh kgâ1, and especially superior cycling stability retaining after 350 cycles. As these results, other metal-oxygen batteries, such as Zn-O2 batteries, Al-O2 batteries, and Na-O2 batteries, can be also used to the rational design of the hierarchical catalyst constructed low-dimensional nanostructure and the lightweight porous carbon nanofiber electrode toward oxygen cathodes.
 J. Lu, L. Li, J. B. Park, Y. K. Sun, F. Wu, K. Amine, Chem. Rev. 2014, 114, 5611.
 P. G. Bruce, S. A. Freunberger, L. J. Hardwick, J. M. Tarascon, Nat. Mater. 2012, 11, 19.
 N. Feng, P. He, H. Zhou, Adv. Energy Mater. 2016, 6, 201502303.
 Y. Li, X. Wang, S. Dong, X. Chen, G. Cui, Adv. Energy Mater. 2016, 6, 201600751.
 J. Wang, Y. Li, X. Sun, Nano Energy 2013, 2, 443.
 Z. Peng, S. A. Freunberger, Y. Chen, P. G. Bruce, Science 2012, 337, 563.