MnO/C core–shell nanorods as high capacity anode materials for lithium-ion batteries

Sun, Bing; Chen, Zhuo; Kim, Hyunsoo; Ahn, Hyo‐Jun; Wang, Guoxiu

doi:10.1016/j.jpowsour.2010.11.090

Cited by 300 publications

(212 citation statements)

References 17 publications

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“…(3) [21,38]. The plateau at 0.75 V disappeared and the one at 0.48 V was shortened in the following discharging cycles, confirming the formation of metallic Mn and Li 2 O matrix [21,37]. On the other hand, in the first charging curve the electrode showed a plateau in the potential range between 1.0 and 1.5 V, which was ascribed to the oxidation of Mn 0 to Mn 2+ [37].These discharging/charging behaviors were consistent with the CV curves shown in Fig.…”

Section: Lithium Storage Performancementioning

confidence: 75%

“…3a, one main peak was observed at around 1.3 V and one weak peak at 2.1 V, corresponding to the oxidation of metallic Mn to Mn 2+ and the decomposition of polymer/gel film related to the SEI layer [37]. These peaks were similar to those of pure MnO 2 but different from those of pure OLC ( Fig.…”

Section: Lithium Storage Performancementioning

confidence: 84%

“…One can see that in the first cathodic cycle there was one weak peak at 0.75 V and one main peak near 0.24 V. The former corresponded to the possible reduction of Mn 4+ to Mn 2+ , while the latter was associated with the complete reduction of Mn 2+ to Mn and the formation of a solid electrolyte interface (SEI) layer at the interface of electrolyte and electrode (a polymer/gel-like film which allowed only lithium ions to diffuse) [36,37]. From the second cathodic cycle, the weak peak disappeared and the main reduction peak shifted to 0.3 V, indicating the reversible phase transformation as given in Eq.…”

Section: Lithium Storage Performancementioning

confidence: 99%

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Core-leaf onion-like carbon/MnO2 hybrid nano-urchins for rechargeable lithium-ion batteries

Wang

Han

et al. 2013

Carbon

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A hybrid nano-urchin structure consisting of spherical onion-like carbon and MnO2 nanosheets is synthesized by a facile and environmentally-friendly hydrothermal method. Lithium-ion batteries incorporating the hybrid nano-urchin anode exhibit reversible lithium storage with superior specific capacity, enhanced rate capability, stable cycling performance, and nearly 100% Coulombic efficiency. These results demonstrate the effectiveness of designing hybrid nano-architectures with uniform and isotropic structure, high loading of electrochemically-active materials, and good conductivity for the dramatic improvement of lithium storage. Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsWang, Y., Han, Z., Yu, S., Song, R., Song, H., Ostrikov, K. & Yang, H. (2013). Core-leaf onion-like carbon/ MnO2 hybrid nano-urchins for rechargeable lithium-ion batteries. Carbon, 64 (November), [230][231][232][233][234][235][236] This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. IntroductionDeveloping high-performance rechargeable lithium-ion batteries (LIBs) is among the most promising solutions to address the drastic increase in global demand of energy [1]. LIBs were introduced to the market in the 1990s by Sony and soon attracted a strong research interest due to their high energy density, stability, and no memory effect, as compared to other alternatives [2]. However, commercial LIBs mostly use graphite as the anode material, which possesses a relatively low theoretical specific capacity of ~372 mAh g -1 . This low capacity severely hampers the wide usage of LIBs in the surging consumer electronic devices and the large-scale energy applications such as hybrid electric vehicles, renewable power plants, and load levelling [3][4][5]. To accommodate the high-level requirements of these advanced applications, it is imperative to explore new electrode materials and novel designs for higher energy density, lower cost, flexibility, non-toxicity, and better stability.The recent advances in nanotechnology have offered a promising route to tackle these challenges [6][7][8][9]. As compared to the bulk materials, nanostructured materials possess a large surface area with excellent electrical, optical, and mechanical properties. Nanomaterials can enhance the performance of LIBs through two approaches. The first one is by using lowdimensional carbon-based nanomaterials to provide more efficient lithiation and delithiation In this work we solve these problems by fabricating the hybrid nano-urchin structure consisting of onion-like carbon/MnO 2 (OLC/MnO 2 ) using a simple and environmentallybenign hydro...

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Section: Lithium Storage Performancementioning

confidence: 75%

Section: Lithium Storage Performancementioning

confidence: 84%

Section: Lithium Storage Performancementioning

confidence: 99%

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Core-leaf onion-like carbon/MnO2 hybrid nano-urchins for rechargeable lithium-ion batteries

Wang

Han

et al. 2013

Carbon

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“…13 To overcome these obstacles, one common strategy is to prepare MnO 2 nanocomposites within a carbon matrix, which can act as both a conductive network increasing the electrical conductivity and a volume buffer to alleviate internal stress. 14,15,16,17,18 The use of three-dimensional (3D)…”

Section: Introductionmentioning

confidence: 99%

Manganese dioxide-anchored three-dimensional nitrogen-doped graphene hybrid aerogels as excellent anode materials for lithium ion batteries

et al. 2015

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The capacity of manganese dioxide (MnO 2 ) deteriorates with cycling due to the irreversible changes induced by the repeated lithiation and delithiation processes. To overcome this drawback, MnO 2 /nitrogen-doped graphene hybrid aerogels (MNGAs) were prepared via a facile redox process between KMnO 4 and carbon within nitrogen-doped graphene hydrogels. The three-dimensional nitrogen-doped graphene hydrogels were prepared and utilized as matrices for MnO 2 deposition. The MNGAs-120 obtained after a deposition time of 120 min delivered a very high discharge capacity of 909 mA h g -1 after 200 cycles at a current density of 400 mA g -1 , in sharp contrast to only 280 and 70 mA h g -1 delivered from nitrogen-doped graphene aerogels and MnO 2 . This discharge capacity is superior to that of the previously reported MnO 2 /carbon based hybrid materials. This material also exhibited an excellent rate capability and cycling performance. Its superior electrochemical performance can be ascribed to the synergistic interaction between uniformly dispersed MnO 2 particles with high capacity and the conductive three-dimensional nitrogen-doped graphene network with a large surface area and an interconnected porous structure. Tel.: +86 10 8254 5576. E-mail: hanbh@nanoctr.cn.Tel.: +61 2 4221 3127. E-mail: gwallace@uow.edu.au. AbstractThe capacity of manganese dioxide (MnO 2 ) deteriorates with cycling due to the irreversible changes induced by the repeated lithiation and delithiation processes. To overcome this drawback, MnO 2 /nitrogen-doped graphene hybrid aerogels (MNGAs) were prepared via a facile redox process between KMnO 4 and carbon within nitrogen-doped graphene hydrogels. The three-dimensional nitrogen-doped graphene hydrogels were prepared and utilized as matrices for MnO 2 deposition. The MNGAs-120 obtained after a deposition time of 120 min delivered a very high discharge capacity of 909 mA h g -1 after 200 cycles at a current density of 400 mA g -1 , in sharp contrast to only 280 and 70 mA h g -1 delivered from nitrogen-doped graphene aerogels and MnO 2 . This discharge capacity is superior to that of the previously reported MnO 2 /carbon based hybrid materials. This material also exhibited an excellent rate capability and cycling performance.Its superior electrochemical performance can be ascribed to the synergistic interaction between uniformly dispersed MnO 2 particles with high capacity and the conductive three-dimensional nitrogen-doped graphene network with a large surface area and interconnected porous structure.

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“…Two intrinsic problems exist, however, for MnO-based anodes, low electrical conductivity and large volume changes during battery cycling, which lead to low coulombic efficiency and cyclability. To solve these problems, much effort has been devoted to constructing MnO@C coreshell composites, [14][15][16][17][18][19] MnO/graphene composites, [20][21][22][23] and MnO/ carbon composites, [24][25][26][27][28][29] which could potentially accommodate the volume changes. Core-shell structures hardly suppress the volume changes in anodes during battery cycling.…”

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confidence: 99%

Integration of MnO@graphene with graphene networks towards Li-ion battery anodes

Guo

et al. 2015

RSC Adv.

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MnO/C core–shell nanorods as high capacity anode materials for lithium-ion batteries

Cited by 300 publications

References 17 publications

Core-leaf onion-like carbon/MnO2 hybrid nano-urchins for rechargeable lithium-ion batteries

Core-leaf onion-like carbon/MnO2 hybrid nano-urchins for rechargeable lithium-ion batteries

Manganese dioxide-anchored three-dimensional nitrogen-doped graphene hybrid aerogels as excellent anode materials for lithium ion batteries

Integration of MnO@graphene with graphene networks towards Li-ion battery anodes

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