Li[Ni0.25Li0.15Mn0.6]O2 nanowires having an aspect ratio of several hundreds and with a diameter of about 30 nm were synthesized at a pH of 2 during a hydrothermal process at 200 degrees C for 5 h without using a template. The nanowires exhibited a first discharge capacity of 311 mA h g(-1) and a rate capability of 95% at 4C (=1200 mA g(-1)).
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March 2019
School of Chemical Engineering, The University of Adelaide, Adelaide, SA, 5005, Australia.
Lithium-oxygen (Li-O ) batteries are attracting more attention owing to their superior theoretical energy density compared to conventional Li-ion battery systems. With regards to the catalytically electrochemical reaction on a cathode, the electrocatalyst plays a key role in determining the performance of Li-O batteries. Herein, a new 3D hollow α-MnO framework (3D α-MnO ) with porous wall assembled by hierarchical α-MnO nanowires is prepared by a template-induced hydrothermal reaction and subsequent annealing treatment.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
December 2018
Center for Hybrid Interfacial Chemical Structure (CICS), Department of Chemistry and Nanoscience, Ewha Womans University, Seoul, 03760, Republic of Korea.
An effective chemical way to optimize the oxygen electrocatalyst and Li-O electrode functionalities of metal oxide can be developed by the control of chemical bond nature with the surface anchoring of highly oxidized selenate (SeO ) clusters. The bond competition between (Se -O) and (Mn-O) bonds is quite effective in stabilizing Jahn-Teller-active Mn state and in increasing oxygen electron density of α-MnO nanowire (NW). The selenate-anchored α-MnO NW shows excellent oxygen electrocatalytic activity and electrode performance for Li-O batteries, which is due to the improved charge transfer kinetics and reversible formation/decomposition of Li O .
View Article and Find Full Text PDFACS Appl Mater Interfaces
September 2016
Laboratory of Clean Energy Chemistry and Materials, State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences , Lanzhou 730000, P. R. China.
The effective shape-controlled synthesis of Co3O4 nanoarrays on nickel foam substrates has been achieved through a simple hydrothermal strategy. When they served as the binder- and conductive-agent-free porous cathodes for nonaqueous Li-O2 batteries, they sufficiently reflect the favorable catalytic characteristic of Co3O4 and alleviate the problems of serious pore blocking and surface passivation caused by insoluble and insulating discharge products. In particular, Co3O4 rectangular nanosheets exhibit superior electrocatalytic performance comparing with Co3O4 nanowires and hexagonal nanosheets, leading to higher specific capacity and better cycling stability over 54 cycles at 100 mA g(-1), which relate to their good pore structure, large specific surface area, and highly active {112} exposed plane, effectively promoting the mass transport and reversible formation and decomposition of discharge products in the cathode.
View Article and Find Full Text PDFNano Lett
August 2016
Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, United States.
Lithium-oxygen (Li-O2) batteries have an extremely high theoretical specific energy density when compared with conventional energy-storage systems. However, practical application of the Li-O2 battery system still faces significant challenges. In this work, we report a new approach for synthesis of ultrafine metal oxide nanocatalysts through an electrochemical prelithiation process.
View Article and Find Full Text PDFACS Appl Mater Interfaces
April 2016
Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan.
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).
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