Nair, Anju K and Elizabeth, Indu and Gopukumar, S. and Thomas, Sabu and Kala, M. S. and Kalarikkal, Nandakumar (2018) Nitrogen doped graphene - Silver nanowire hybrids: An excellent anode material for lithium ion batteries. Applied Surface Science, 428. pp. 1119-1129. ISSN 0169-4332

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We present an in-situ polyol assisted synthesis approach for the preparation of silver nanowires (AgNW) over the nitrogen doped graphene (NG) sheets and has been tested as a viable LIBs anode material for the first time. The use of NG serves as nucleation sites, thereby facilitating the growth of AgNWs. The specific material design of the as-prepared NG-AgNW hybrids involves some advantages, including a continuous AgNW-graphene conducting network. Since AgNWs are electrically conductive, it provides an electrical contact with NG sheets which can effectively help the charge transport process and limit the variations in volume during the lithiation/de-lithiation processes. Apart from this, the insertion of metallic Ag nanowires into a percolated NG network increases the interlayer distance of NG sheets and prevent its restacking. Moreover, the more porous nature of the hybrid structure accommodating the large volume changes of AgNWs. As an anode material for LIBs, the NG-AgNW hybrid displays a remarkable initial discharge capacity of 1215 mAh g(-1) and attains a stable capacity of 724 mAh g(-1) at a current density of 100 mAg(-1) after 50 cycles. The electrode exhibits a stable reversible capacity of 714, 634, 550 and 464 mAh g(-1) at 0.1, 0.2, 0.5, 1 Ag-1 respectively. The reversible capacity (710 mAh g(-1)) at 0.1 Ag-1 is recovered after the cycling at various current densities confirming outstanding rate performance of the material. In addition, the coulombic efficiency, the NG-AgNW anode retains nearly 99% after the second cycle, further indicating its excellent reversibility. The hybrid material exhibits better cycling stability, greater rate capability, capacity retention and superior reversible capacity than that of bare AgNW and NG sheets. Our smart design will pave way for the development of efficient electrode materials for high capacity and long cycle life LIBs.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s Elsevier.
Subjects: Chemistry > Physical Chemistry
Materials Science
Applied Physics/Condensed Matter
Depositing User: Mr. Yogesh Joshi
Date Deposited: 07 Nov 2019 11:37
Last Modified: 07 Nov 2019 11:37

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