Nitrogen‐Doped Graphene Ribbon Assembled Core–Sheath MnO@Graphene Scrolls as Hierarchically Ordered 3D Porous Electrodes for Fast and Durable Lithium Storage

Abstract

Dou, S. (2016). Nitrogen-doped graphene ribbon assembled coresheath MnO@Graphene scrolls as hierarchically ordered 3D porous electrodes for fast and durable lithium storage. Advanced Functional Materials, 26 (43), 7754-7765. Nitrogen-doped graphene ribbon assembled core-sheath MnO@Graphene scrolls as hierarchically ordered 3D porous electrodes for fast and durable lithium storage AbstractGraphene scroll is an emerging 1D tubular form of graphitic carbon that has potential applications in electrochemical energy storage. However, it still remains a challenge to composite graphene scrolls with other nanomaterials for building advanced electrode configuration with fast and durable lithium storage properties. Here, a transition-metal-oxide-based hierarchically ordered 3D porous electrode is designed based on assembling 1D core-sheath MnO@N-doped graphene scrolls with 2D N-doped graphene ribbons. In the resulting architecture, porous MnO nanowires confined in tubular graphene scrolls are mechanically isolated but electronically wellconnected, while the interwoven graphene ribbons offer continuous conductive paths for electron transfer in all directions. Moreover, the elastic graphene scrolls together with enough internal voids are able to accommodate the volume expansion of the enclosed MnO. Because of these merits, the asbuilt electrode manifests ultrahigh rate capability (349 mAh g−1 at 8.0 A g−1; 205 mAh g−1 at 15.0 A g−1) and robust cycling stability (812 mAh g−1 remaining after 1000 cycles at 2.0 A g−1) and is the most efficient MnO-based anode ever reported for lithium-ion batteries. This unique multidimensional and hierarchically ordered structure design is believed to hold great potential in generalizable synthesis of graphene scrolls composited with oxide nanowires for mutifuctional energy storage.Keywords core-sheath, mno@graphene, nitrogen-doped, ordered, 3d, porous, electrodes, fast, durable, graphene, scrolls, hierarchically, lithium, storage, assembled, ribbon Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsZhang, Y., Chen, P., Gao, X., Wang, B., Liu, H., Wu, H., Liu, H. & Dou, S. (2016). Nitrogen-doped graphene ribbon assembled core-sheath MnO@Graphene scrolls as hierarchically ordered 3D porous electrodes for fast and durable lithium storage. Advanced Functional Materials, 26 (43), 7754-7765. AuthorsYun Zhang, Penghui Chen, Xu Gao, Bo Wang, Heng Liu, Haobin Wu, Hua-Kun Liu, and Shi Xue Dou This journal article is available at Research Online: http://ro.uow.edu.au/aiimpapers/2275 1 PUBLISHED TITLE -"Nitrogen-doped graphene ribbon assembled core-sheath MnO@Graphene scrolls as hierarchically ordered 3D porous electrodes for fast and durable lithium storage" Engineering 3D Hierarchical Anode Configuration Based on Nitrogen-Doped Graphene-Scrolled MnO Coaxial Nanocables for Superior Lithium StorageHao Wu, Penghui Chen, Yi Guo, Bo Wang, Wenjing Liu, Heng Liu, Yun Zhang, Shixue Dou, and Huakun Liu Keywords: hierarchical structure; graphene scrolls; nitrogen doping; MnO n...

Hierarchical MnO@C Hollow Nanospheres for Advanced Lithium-Ion Battery Anodes

“…The Mn 2p spectrum shows two signals at 652.8 and 640.8 eV, which can be assigned to Mn 2p 1/2 and Mn 2p 3/2 , respectively (Figure 5b). These peaks agree well with the reported values of MnO, 13,28,42 proving that the manganese primarily exists in the form of Mn(II). It may be noted that a weak Mn 3s peak exists at about 82.7 eV (Figure 5a), which is consistent with the value reported for MnO.…”

Sodium Sulfate Template-Directed Methodology of Rolling Up a Two-Dimensional Graphene Nanosheet into a One-Dimensional Nanoscroll and Its Anode Performance in a Lithium-Ion Battery

“…Compared with graphite oxide, the 1D-GNS obtained by high-temperature reduction (700 °C for 1 h under Ar/H 2 (95:5) atmosphere) shows a hump at 25.9°, which is the characteristic peak of rGO, indicating that the 1D-GNS is composed of a few layers of rGO sheets with low graphitization and the graphite oxide was fully exfoliated and reduced. , Figure B shows the FTIR spectra of graphite oxide and 1D-GNS. In contrast to pristine graphite oxide, the disappearance or severe weakening of the characteristic absorption bands for 1D-GNS at 1724, 1378, 1261, and 1049 cm –1 indicates that most of the corresponding oxygen-containing groups (−COOH, epoxy, −OH, and alkoxy) in graphite oxide were finally removed. − This is consistent with the result of the XRD. In addition, XPS characterization was performed to probe the chemical state of graphite oxide and 1D-GNS.…”

In Situ Synthesis of 1D Mesoporous MnO@C Nanorods for High Performance Li-Ion Batteries

“…After the 200th cycle, the charge/discharge capacities have tended to be stable, and it delivers the discharge capacity of 1210.1 mAh g –1 at the 400th cycle. This phenomenon has been reported many times in previously reported works for a MnO-based anode in LIBs. ,− , The capacity gradually decreases at the beginning, which can be ascribed to the generation of the SEI layer and the slow activation process. This is the ubiquitous circumstance for most TMOs-based anode material. ,, In order to verify it, EIS measurements and corresponding fitting results discussions of one cell at initial and after the first charge–discharge have been performed, respectively, as shown in Figure S11.…”