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Three-Dimensional (3D) Bicontinuous Hierarchically Porous Mn2O3 Single Crystals for High Performance Lithium-Ion Batteries.

Huang SZ, Jin J, Cai Y, Li Y, Deng Z, Zeng JY, Liu J, Wang C, Hasan T, Su BL - Sci Rep (2015)

Bottom Line: Our synthesized BHP-Mn2O3-SCs with a size of ~700 nm display the best electrochemical performance, with a large reversible capacity (845 mA h g(-1) at 100 mA g(-1) after 50 cycles), high coulombic efficiency (>95%), excellent cycling stability and superior rate capability (410 mA h g(-1) at 1 Ag(-1)).These values are among the highest reported for Mn2O3-based bulk solids and nanostructures.Also, electrochemical impedance spectroscopy study demonstrates that the BHP-Mn2O3-SCs are suitable for charge transfer at the electrode/electrolyte interface.

View Article: PubMed Central - PubMed

Affiliation: Laboratory of Living Materials at the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, 430070, Wuhan, Hubei, China.

ABSTRACT
Bicontinuous hierarchically porous Mn2O3 single crystals (BHP-Mn2O3-SCs) with uniform parallelepiped geometry and tunable sizes have been synthesized and used as anode materials for lithium-ion batteries (LIBs). The monodispersed BHP-Mn2O3-SCs exhibit high specific surface area and three dimensional interconnected bimodal mesoporosity throughout the entire crystal. Such hierarchical interpenetrating porous framework can not only provide a large number of active sites for Li ion insertion, but also good conductivity and short diffusion length for Li ions, leading to a high lithium storage capacity and enhanced rate capability. Furthermore, owing to their specific porosity, these BHP-Mn2O3-SCs as anode materials can accommodate the volume expansion/contraction that occurs with lithium insertion/extraction during discharge/charge processes, resulting in their good cycling performance. Our synthesized BHP-Mn2O3-SCs with a size of ~700 nm display the best electrochemical performance, with a large reversible capacity (845 mA h g(-1) at 100 mA g(-1) after 50 cycles), high coulombic efficiency (>95%), excellent cycling stability and superior rate capability (410 mA h g(-1) at 1 Ag(-1)). These values are among the highest reported for Mn2O3-based bulk solids and nanostructures. Also, electrochemical impedance spectroscopy study demonstrates that the BHP-Mn2O3-SCs are suitable for charge transfer at the electrode/electrolyte interface.

No MeSH data available.


Related in: MedlinePlus

TEM images and N2 sorption isotherm of the BHP-Mn2O3-SCs (MO-15 sample): (a) low magnification TEM image, the inset in (a) is the corresponding SAED pattern; (b) high magnification TEM image; (c) HRTEM image, the inset in (c) is the crystal structure of Mn2O3 along the [111] direction; (d) N2 sorption isotherm, the inset in (d) is the pore size distribution.
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f3: TEM images and N2 sorption isotherm of the BHP-Mn2O3-SCs (MO-15 sample): (a) low magnification TEM image, the inset in (a) is the corresponding SAED pattern; (b) high magnification TEM image; (c) HRTEM image, the inset in (c) is the crystal structure of Mn2O3 along the [111] direction; (d) N2 sorption isotherm, the inset in (d) is the pore size distribution.

Mentions: Figure 3 displays the TEM images and N2 sorption isotherm of MO-15. Low magnification TEM image shows an average size of ~700 nm (see Supplementary Figure S2), consistent with the SEM images shown in Fig. 2b,c. Figure 3a presents a typical TEM image of an individual Mn2O3 parallelepiped single crystal, revealing that MO-15 exhibits a bicontinuous hierarchical structure with interconnected porous channels. The SAED patterns (Fig. 3a, inset) of one Mn2O3 parallelepiped single crystal demonstrate marginally sharper diffraction spots, clearly indicating the single crystal nature of Mn2O3 with ordered network arranged along the [111] direction. A higher magnification TEM image (Fig. 3b) further reveals that the Mn2O3 parallelepiped single crystals contain a bicontinuous structure with interconnected hierarchical bimodal mesoporosities (the corresponding enlarged TEM image is shown in Supplementary Figure S3). The HRTEM image in Fig. 3c demonstrates well-resolved lattice fringes with an interplanar spacing of 0.333 nm, corresponding to the (20-2) plane and (02–2) plane along the [111] direction. The inset in Fig. 3c shows the atomic arrangement of the cubic Mn2O3 along the [111] direction. N2 adsorption-desorption isotherm of the MO-15 in Fig. 3d shows a typical Type IV isotherm with H1 type hysteresis, revealing a uniform mesoporous structure21. The BET specific surface area is 34 m2 g−1. The pore size distribution plot (inset of Fig. 3d) shows a large-pore-size distribution of ~32.8 nm and another small-pore-size distribution of ~6.2 nm, confirming the SEM and TEM observations of bimodal mesoporosity of these Mn2O3 SCs.


Three-Dimensional (3D) Bicontinuous Hierarchically Porous Mn2O3 Single Crystals for High Performance Lithium-Ion Batteries.

Huang SZ, Jin J, Cai Y, Li Y, Deng Z, Zeng JY, Liu J, Wang C, Hasan T, Su BL - Sci Rep (2015)

TEM images and N2 sorption isotherm of the BHP-Mn2O3-SCs (MO-15 sample): (a) low magnification TEM image, the inset in (a) is the corresponding SAED pattern; (b) high magnification TEM image; (c) HRTEM image, the inset in (c) is the crystal structure of Mn2O3 along the [111] direction; (d) N2 sorption isotherm, the inset in (d) is the pore size distribution.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4593967&req=5

f3: TEM images and N2 sorption isotherm of the BHP-Mn2O3-SCs (MO-15 sample): (a) low magnification TEM image, the inset in (a) is the corresponding SAED pattern; (b) high magnification TEM image; (c) HRTEM image, the inset in (c) is the crystal structure of Mn2O3 along the [111] direction; (d) N2 sorption isotherm, the inset in (d) is the pore size distribution.
Mentions: Figure 3 displays the TEM images and N2 sorption isotherm of MO-15. Low magnification TEM image shows an average size of ~700 nm (see Supplementary Figure S2), consistent with the SEM images shown in Fig. 2b,c. Figure 3a presents a typical TEM image of an individual Mn2O3 parallelepiped single crystal, revealing that MO-15 exhibits a bicontinuous hierarchical structure with interconnected porous channels. The SAED patterns (Fig. 3a, inset) of one Mn2O3 parallelepiped single crystal demonstrate marginally sharper diffraction spots, clearly indicating the single crystal nature of Mn2O3 with ordered network arranged along the [111] direction. A higher magnification TEM image (Fig. 3b) further reveals that the Mn2O3 parallelepiped single crystals contain a bicontinuous structure with interconnected hierarchical bimodal mesoporosities (the corresponding enlarged TEM image is shown in Supplementary Figure S3). The HRTEM image in Fig. 3c demonstrates well-resolved lattice fringes with an interplanar spacing of 0.333 nm, corresponding to the (20-2) plane and (02–2) plane along the [111] direction. The inset in Fig. 3c shows the atomic arrangement of the cubic Mn2O3 along the [111] direction. N2 adsorption-desorption isotherm of the MO-15 in Fig. 3d shows a typical Type IV isotherm with H1 type hysteresis, revealing a uniform mesoporous structure21. The BET specific surface area is 34 m2 g−1. The pore size distribution plot (inset of Fig. 3d) shows a large-pore-size distribution of ~32.8 nm and another small-pore-size distribution of ~6.2 nm, confirming the SEM and TEM observations of bimodal mesoporosity of these Mn2O3 SCs.

Bottom Line: Our synthesized BHP-Mn2O3-SCs with a size of ~700 nm display the best electrochemical performance, with a large reversible capacity (845 mA h g(-1) at 100 mA g(-1) after 50 cycles), high coulombic efficiency (>95%), excellent cycling stability and superior rate capability (410 mA h g(-1) at 1 Ag(-1)).These values are among the highest reported for Mn2O3-based bulk solids and nanostructures.Also, electrochemical impedance spectroscopy study demonstrates that the BHP-Mn2O3-SCs are suitable for charge transfer at the electrode/electrolyte interface.

View Article: PubMed Central - PubMed

Affiliation: Laboratory of Living Materials at the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 122 Luoshi Road, 430070, Wuhan, Hubei, China.

ABSTRACT
Bicontinuous hierarchically porous Mn2O3 single crystals (BHP-Mn2O3-SCs) with uniform parallelepiped geometry and tunable sizes have been synthesized and used as anode materials for lithium-ion batteries (LIBs). The monodispersed BHP-Mn2O3-SCs exhibit high specific surface area and three dimensional interconnected bimodal mesoporosity throughout the entire crystal. Such hierarchical interpenetrating porous framework can not only provide a large number of active sites for Li ion insertion, but also good conductivity and short diffusion length for Li ions, leading to a high lithium storage capacity and enhanced rate capability. Furthermore, owing to their specific porosity, these BHP-Mn2O3-SCs as anode materials can accommodate the volume expansion/contraction that occurs with lithium insertion/extraction during discharge/charge processes, resulting in their good cycling performance. Our synthesized BHP-Mn2O3-SCs with a size of ~700 nm display the best electrochemical performance, with a large reversible capacity (845 mA h g(-1) at 100 mA g(-1) after 50 cycles), high coulombic efficiency (>95%), excellent cycling stability and superior rate capability (410 mA h g(-1) at 1 Ag(-1)). These values are among the highest reported for Mn2O3-based bulk solids and nanostructures. Also, electrochemical impedance spectroscopy study demonstrates that the BHP-Mn2O3-SCs are suitable for charge transfer at the electrode/electrolyte interface.

No MeSH data available.


Related in: MedlinePlus