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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

The ex-situ TEM and HRTEM characterizations of MO-5, MO-15 and MO-30 electrodes after 50 discharge-charge cycles at 100 mA g−1:(a–b) MO-15; (c–d) MO-15 and (e–f) MO-30.
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f7: The ex-situ TEM and HRTEM characterizations of MO-5, MO-15 and MO-30 electrodes after 50 discharge-charge cycles at 100 mA g−1:(a–b) MO-15; (c–d) MO-15 and (e–f) MO-30.

Mentions: The high lithium storage capacity and excellent rate capability of MO-15 and MO-30 samples can be ascribed to the three dimensional interconnected porous framework that provides excellent structural stability, bicontinuous Li+ and e− pathways, and good electronic conductivity. To further understand the Li+ storage property and structural stability of the BHP-Mn2O3-SCs, post-mortem investigations after 50 discharge-charge cycles at 100 mA g−1 are carried out by SEM, TEM and HRTEM (see Supplementary Figure S9 and Fig. 7). We find that after 50 cycles, the morphology and porous structure of MO-15 and MO-30 are perfectly preserved without any structural alterations, while the structure of MO-5 is slightly destroyed, which partially accounts for the capacity decay of MO-5 (Fig. 7a). In addition, HRTEM images (Fig. 7b,d,f) reveal that after 50 cycles, the Mn2O3 electrodes are changed to polycrystalline structure. Although partial amorphization happens on the Mn2O3 electrodes, they still show high crystallinity, which ensures good conductivity of the electrodes upon cycling. Furthermore, to verify the structure superiority imposed on electrochemical behavior, we compare the electrochemical performance of BHP-Mn2O3-SCs with the solid Mn2O3 nanoparticles (see Supplementary Figures S10a and b). The electrochemical results distinctly demonstrate the MO-15 and MO-30 samples show better cycling performance and rate capability than those of Mn2O3 spheres (see Supplementary Figures S10c and d), indicating the three dimensional interconnected porous framework is very favourable for the improvement of lithium storage performance.


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)

The ex-situ TEM and HRTEM characterizations of MO-5, MO-15 and MO-30 electrodes after 50 discharge-charge cycles at 100 mA g−1:(a–b) MO-15; (c–d) MO-15 and (e–f) MO-30.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f7: The ex-situ TEM and HRTEM characterizations of MO-5, MO-15 and MO-30 electrodes after 50 discharge-charge cycles at 100 mA g−1:(a–b) MO-15; (c–d) MO-15 and (e–f) MO-30.
Mentions: The high lithium storage capacity and excellent rate capability of MO-15 and MO-30 samples can be ascribed to the three dimensional interconnected porous framework that provides excellent structural stability, bicontinuous Li+ and e− pathways, and good electronic conductivity. To further understand the Li+ storage property and structural stability of the BHP-Mn2O3-SCs, post-mortem investigations after 50 discharge-charge cycles at 100 mA g−1 are carried out by SEM, TEM and HRTEM (see Supplementary Figure S9 and Fig. 7). We find that after 50 cycles, the morphology and porous structure of MO-15 and MO-30 are perfectly preserved without any structural alterations, while the structure of MO-5 is slightly destroyed, which partially accounts for the capacity decay of MO-5 (Fig. 7a). In addition, HRTEM images (Fig. 7b,d,f) reveal that after 50 cycles, the Mn2O3 electrodes are changed to polycrystalline structure. Although partial amorphization happens on the Mn2O3 electrodes, they still show high crystallinity, which ensures good conductivity of the electrodes upon cycling. Furthermore, to verify the structure superiority imposed on electrochemical behavior, we compare the electrochemical performance of BHP-Mn2O3-SCs with the solid Mn2O3 nanoparticles (see Supplementary Figures S10a and b). The electrochemical results distinctly demonstrate the MO-15 and MO-30 samples show better cycling performance and rate capability than those of Mn2O3 spheres (see Supplementary Figures S10c and d), indicating the three dimensional interconnected porous framework is very favourable for the improvement of lithium storage performance.

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