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Co3V2O8 Sponge Network Morphology Derived from Metal–Organic Framework as an Excellent Lithium Storage Anode Material

Soundharrajan, Vaiyapuri, Sambandam, Balaji, Song, Jinju, Kim, Sungjin, Jo, Jeonggeun, Kim, Seokhun, Lee, Seulgi, Mathew, Vinod, Kim, Jaekook
ACS Applied Materials & Interfaces 2016 v.8 no.13 pp. 8546-8553
X-ray diffraction, X-ray photoelectron spectroscopy, anodes, coordination polymers, electrochemistry, electron microscopy, energy, lithium, lithium batteries, nanoparticles, oxides
Metal–organic framework (MOF)-based synthesis of battery electrodes has presntly become a topic of significant research interest. Considering the complications to prepare Co₃V₂O₈ due to the criticality of its stoichiometric composition, we report on a simple MOF-based solvothermal synthesis of Co₃V₂O₈ for use as potential anodes for lithium battery applications. Characterizations by X-ray diffraction, X-ray photoelectron spectroscopy, high resolution electron microscopy, and porous studies revealed that the phase pure Co₃V₂O₈ nanoparticles are interconnected to form a sponge-like morphology with porous properties. Electrochemical measurements exposed the excellent lithium storage (∼1000 mAh g–¹ at 200 mA g–¹) and retention properties (501 mAh g–¹ at 1000 mA g–¹ after 700 cycles) of the prepared Co₃V₂O₈ electrode. A notable rate performance of 430 mAh g–¹ at 3200 mA g–¹ was also observed, and ex situ investigations confirmed the morphological and structural stability of this material. These results validate that the unique nanostructured morphology arising from the use of the ordered array of MOF networks is favorable for improving the cyclability and rate capability in battery electrodes. The synthetic strategy presented herein may provide solutions to develop phase pure mixed metal oxides for high-performance electrodes for useful energy storage applications.