Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 858, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.157648
Keywords
Secondary battery; binary Transition metal oxide; hierarchical Structure; Energy storage; Capacity
Categories
Funding
- Science and Technology Major Project of Anhui Province [18030901093]
- Key Research and Development Program of Wuhu [2019YF07]
- Natural Science Research Project for Universities in Anhui Province [KJ2018ZD034, KJ2019A0502]
- National Natural Science Foundation of China [51672176, 21901157]
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This study introduces a hierarchical material consisting of CoMoO4 nanotubes coated with PANI hydrogel nanorods for lithium-ion battery anodes, showing high capacity and Coulombic efficiency, with density functional theory calculations analyzing state density and band gap.
Hierarchical materials have been considered promising for secondary battery electrodes owing to their capability of accommodating volumetric change of active materials and providing short pathways for rapid transportation of ions and electrons. Herein, we present a rod-on-tube composite consisting of cobalt molybdate (CoMoO4) nanotubes coating with polyaniline (PANI) hydrogel nanorods, which exhibits a high electrochemical performance as Li-ion battery anode. The hierarchical CoMoO4@PANI is prepared through in-situ polymerizing PANI nanorods on the CoMoO4 nanotubes. The rod-on-tube structure could alleviate the volumetric change of CoMoO4 during lithiation-delithiation, and improve conductivity for electron transfer. When cycling at 0.5 A g(-1), the presented CoMoO4@PANI anodes exhibit a large capacity of 805 mAh g(-1) after 150 cycles along with a Coulombic efficiency of 99%, which are both exceeding those of the pristine CoMoO4. A well-recoverable rate-performance is achieved. Furthermore, the density of state (DOS) and band gap of the CoMoO4@PANI and pristine CoMoO4 are also investigated by using density functional theory (DFT) calculations. (C) 2020 Elsevier B.V. All rights reserved.
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