title: Hierarchical Porous Nickel Cobaltate Nanoneedle Arrays as Flexible Carbon-Protected Cathodes for High-Performance Lithium-Oxygen Batteries.
abstract: Rechargeable lithium-oxygen (Li-O2) batteries are consequently considered to be an attractive energy storage technology because of the high theoretical energy densities. Here, an effective binder-free cathode with high capacity for Li-O2 batteries, needle-like mesoporous NiCo2O4 nanowire arrays uniformly coated on the flexible carbon textile have been in situ fabricated via a facile hydrothermal process followed by low temperature calcination. Because of the material and structural features, the needle-like NiCo2O4 nanowire arrays (NCONWAs) served as a binder-free cathode exhibits high specific capacity (4221 mAh g(-1)), excellent rate capability, and outstanding cycling stability (200 cycles). This cathode based on nonprecious mesoporous metal oxides nanowire arrays has large open spaces and high surface area, providing numerous catalytically active sites and effective transmission pathways for lithium ion and oxygen, and promises the abundant Li2O2 storage. The fast electron transport by directly anchoring on the substrate ensures fast electrochemical reaction process involved with the every nanowire. Furthermore, a bendable Li-O2 battery assembled by using the flexible NCONWAs as the cathode, can be able to light an LED and shows good rate capability and cyclic stability.
authors.affiliation: College of Materials Science and Technology, Jiangsu Key Laboratory of Materials and Technology for Energy Conversion, Nanjing University of Aeronautics and Astronautics , Nanjing 210016, PR China.|Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba 305-8568, Japan.
authors.forename: Hairong
authors.initials: H
authors.lastname: Xue
authors.affiliation: Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba 305-8568, Japan.
authors.forename: Shichao
authors.initials: S
authors.lastname: Wu
authors.affiliation: Faculty of Science and Engineering, Waseda University , 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan.
authors.forename: Jing
authors.initials: J
authors.lastname: Tang
authors.affiliation: College of Materials Science and Technology, Jiangsu Key Laboratory of Materials and Technology for Energy Conversion, Nanjing University of Aeronautics and Astronautics , Nanjing 210016, PR China.
authors.forename: Hao
authors.initials: H
authors.lastname: Gong
authors.affiliation: National Laboratory of Solid State Microstructures & Center of Energy Storage Materials and Technology, Nanjing University , Nanjing 210093, China.
authors.forename: Ping
authors.initials: P
authors.lastname: He
authors.affiliation: College of Materials Science and Technology, Jiangsu Key Laboratory of Materials and Technology for Energy Conversion, Nanjing University of Aeronautics and Astronautics , Nanjing 210016, PR China.
authors.forename: Jianping
authors.initials: J
authors.lastname: He
authors.affiliation: Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST) , Tsukuba 305-8568, Japan.|National Laboratory of Solid State Microstructures & Center of Energy Storage Materials and Technology, Nanjing University , Nanjing 210093, China.
authors.forename: Haoshen
authors.initials: H
authors.lastname: Zhou
keywords: binder-free; flexible cathode; lithium−oxygen batteries; long life; mesoporous nickel cobaltate