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Title: Transition metal hollow nanocages as promising cathodes for the long-term cyclability of Li-O-2 batteries
Authors: Chatterjee, A 
Or, SW 
Cao, YL 
Keywords: Electrocatalytic cathodes
Hollow nanocages
Li-O-2 batteries
Cyclic stability
Transition metals
Issue Date: 2018
Publisher: Molecular Diversity Preservation International (MDPI)
Source: Nanomaterials, May 2018, v. 8, no. 5, 308 How to cite?
Journal: Nanomaterials 
Abstract: As a step towards efficient and cost-effective electrocatalytic cathodes for Li-O-2 batteries, highly porous hausmannite-type Mn3O4 hollow nanocages (MOHNs) of a large diameter of -250 nm and a high surface area of 90.65 m(2).g(-1) were synthesized and their physicochemical and electrochemical properties were studied in addition to their formation mechanism. A facile approach using carbon spheres as the template and MnCl2 as the precursor was adopted to suit the purpose. The MOHNs/Ketjenblack cathode-based Li-O-2 battery demonstrated an improved cyclability of 50 discharge-charge cycles at a specific current of 400 mA.g(-1) and a specific capacity of 600 mAh.g(-1). In contrast, the Ketjenblack cathode-based one can sustain only 15 cycles under the same electrolytic system comprised of 1 M LiTFSI/TEGDME. It is surmised that the unique hollow nanocage morphology of MOHNs is responsible for the high electrochemical performance. The hollow nanocages were a result of the aggregation of crystalline nanoparticles of 25-35 nm size, and the mesoscopic pores between the nanoparticles gave rise to a loosely mesoporous structure for accommodating the volume change in the MOHNs/Ketjenblack cathode during electrocatalytic reactions. The improved cyclic stability is mainly due to the faster mass transport of the O-2 through the mesoscopic pores. This work is comparable to the state-of-the-art experimentations on cathodes for Li-O-2 batteries that focus on the use of non-precious transition materials.
ISSN: 2079-4991
DOI: 10.3390/nano8050308
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