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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

Electrochemical performances of the MO-5, MO-15 and MO-30 electrodes.(a) Cyclic voltammograms at a scanning rate of 0.1 mV s−1 in the voltage range of 0 ~ 3 V versus Li/Li+, respectively; (b) the first and second charge-discharge profiles at 100 mA g−1 in the voltage range of 0.01 V–3 V; (c) cycling performance and coulombic effciencies at 100 mA g−1; (d) charge-discharge capacities at various rates; (e) charge-discharge profiles of MO-15 at various rates; (f) cycling performance of MO-15 at 1000 mA g−1 following the rate test.
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f6: Electrochemical performances of the MO-5, MO-15 and MO-30 electrodes.(a) Cyclic voltammograms at a scanning rate of 0.1 mV s−1 in the voltage range of 0 ~ 3 V versus Li/Li+, respectively; (b) the first and second charge-discharge profiles at 100 mA g−1 in the voltage range of 0.01 V–3 V; (c) cycling performance and coulombic effciencies at 100 mA g−1; (d) charge-discharge capacities at various rates; (e) charge-discharge profiles of MO-15 at various rates; (f) cycling performance of MO-15 at 1000 mA g−1 following the rate test.

Mentions: The electrochemical behaviours of MO-5, MO-15 and MO-30 are studied by cyclic voltammetry (CV) for the first and second cycles (Fig. 6a) in the voltage range of 3-0 V versus Li/Li+ at a scan rate of 0.1 mV s−1 (see Supplementary Figure S8 for the individual plots). For the first cycle, both the MO-15 and MO-30 samples deliver three cathodic peaks. The two broad peaks located at 0.68 V and 1.2 V are attributed to the decomposition of the electrolyte solvent and the formation of the solid electrolyte interphase (SEI) layer, as well as the reduction of Mn3+ to Mn2+26272829. Another distinct peak at ~0.1 V is ascribed to a further reduction of MnO to Mn303132. Compared with MO-15 and MO-30, MO-5 exhibits an additional cathodic peak at ~0.82 V. This could be attributed to the electrochemical reaction between the Mn5O8 impurity and Li ions. In the anodic scan, an anodic peak at ~1.3 V can be observed for all three samples. This peak is associated with the oxidation of Mn to MnO. Compared with the first cathodic process, the peak current density and integrated area of the second cathodic process are smaller, indicating the initial discharge capacity decays after the first charging process.


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)

Electrochemical performances of the MO-5, MO-15 and MO-30 electrodes.(a) Cyclic voltammograms at a scanning rate of 0.1 mV s−1 in the voltage range of 0 ~ 3 V versus Li/Li+, respectively; (b) the first and second charge-discharge profiles at 100 mA g−1 in the voltage range of 0.01 V–3 V; (c) cycling performance and coulombic effciencies at 100 mA g−1; (d) charge-discharge capacities at various rates; (e) charge-discharge profiles of MO-15 at various rates; (f) cycling performance of MO-15 at 1000 mA g−1 following the rate test.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f6: Electrochemical performances of the MO-5, MO-15 and MO-30 electrodes.(a) Cyclic voltammograms at a scanning rate of 0.1 mV s−1 in the voltage range of 0 ~ 3 V versus Li/Li+, respectively; (b) the first and second charge-discharge profiles at 100 mA g−1 in the voltage range of 0.01 V–3 V; (c) cycling performance and coulombic effciencies at 100 mA g−1; (d) charge-discharge capacities at various rates; (e) charge-discharge profiles of MO-15 at various rates; (f) cycling performance of MO-15 at 1000 mA g−1 following the rate test.
Mentions: The electrochemical behaviours of MO-5, MO-15 and MO-30 are studied by cyclic voltammetry (CV) for the first and second cycles (Fig. 6a) in the voltage range of 3-0 V versus Li/Li+ at a scan rate of 0.1 mV s−1 (see Supplementary Figure S8 for the individual plots). For the first cycle, both the MO-15 and MO-30 samples deliver three cathodic peaks. The two broad peaks located at 0.68 V and 1.2 V are attributed to the decomposition of the electrolyte solvent and the formation of the solid electrolyte interphase (SEI) layer, as well as the reduction of Mn3+ to Mn2+26272829. Another distinct peak at ~0.1 V is ascribed to a further reduction of MnO to Mn303132. Compared with MO-15 and MO-30, MO-5 exhibits an additional cathodic peak at ~0.82 V. This could be attributed to the electrochemical reaction between the Mn5O8 impurity and Li ions. In the anodic scan, an anodic peak at ~1.3 V can be observed for all three samples. This peak is associated with the oxidation of Mn to MnO. Compared with the first cathodic process, the peak current density and integrated area of the second cathodic process are smaller, indicating the initial discharge capacity decays after the first charging process.

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