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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.


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(a) Illustration of the preparation processes of BHP-Mn2O3-SCs; (b) illustration of lithium insertion mechanism in the BHP-Mn2O3-SCs with fast electron transportation, large electrode-electrolyte contact area and shortened Li ion transport pathways.
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f4: (a) Illustration of the preparation processes of BHP-Mn2O3-SCs; (b) illustration of lithium insertion mechanism in the BHP-Mn2O3-SCs with fast electron transportation, large electrode-electrolyte contact area and shortened Li ion transport pathways.

Mentions: Based on the SEM and TEM observations, a formation mechanism of the BHP-Mn2O3-SCs is illustrated in Fig. 4a. First, the MnO4− ions assemble together with the functional Ethylene Glycol (EG) molecules under stirring, followed by the formation of primary nanoparticles during redox reactions between the MnO4− ions and hydroxyl (-OH) groups of EG. Subsequently, the primary nanoparticles rapidly grow along a particular crystallographic orientation, to form MnCO3 SCs via the Ostwald ripening mechanism22. After 0.5 h reaction, parallelepiped shaped MnCO3 crystals form (see Supplementary Figure S4), indicating very fast growth of the crystals during the reaction. Finally, the porous Mn2O3 SCs are obtained by thermal decomposition of MnCO3 under air atmosphere. The reaction equations can be written as:


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)

(a) Illustration of the preparation processes of BHP-Mn2O3-SCs; (b) illustration of lithium insertion mechanism in the BHP-Mn2O3-SCs with fast electron transportation, large electrode-electrolyte contact area and shortened Li ion transport pathways.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f4: (a) Illustration of the preparation processes of BHP-Mn2O3-SCs; (b) illustration of lithium insertion mechanism in the BHP-Mn2O3-SCs with fast electron transportation, large electrode-electrolyte contact area and shortened Li ion transport pathways.
Mentions: Based on the SEM and TEM observations, a formation mechanism of the BHP-Mn2O3-SCs is illustrated in Fig. 4a. First, the MnO4− ions assemble together with the functional Ethylene Glycol (EG) molecules under stirring, followed by the formation of primary nanoparticles during redox reactions between the MnO4− ions and hydroxyl (-OH) groups of EG. Subsequently, the primary nanoparticles rapidly grow along a particular crystallographic orientation, to form MnCO3 SCs via the Ostwald ripening mechanism22. After 0.5 h reaction, parallelepiped shaped MnCO3 crystals form (see Supplementary Figure S4), indicating very fast growth of the crystals during the reaction. Finally, the porous Mn2O3 SCs are obtained by thermal decomposition of MnCO3 under air atmosphere. The reaction equations can be written as:

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