Co-reporter:Xiaojian Ma, Nana Wang, Yitai Qian, Zhongchao Bai
Materials Letters 2016 Volume 168() pp:5-8
Publication Date(Web):1 April 2016
DOI:10.1016/j.matlet.2016.01.019
•A large-scale route was developed to synthesize NiO polyhedron nanocrystals.•NiO polyhedron nanocrystals possesses relatively uniform size of 2 μm.•The sample maintains 645.5 mAh g−1 at 1000 mA g−1 after 100 cycles.NiO polyhedron nanocrystals have been synthesized using a single source of nickel chloride through a calcination reaction. The electrochemical results displayed that the obtained sample is an outstanding anode material for lithium ion batteries (LIBs). The sample maintains a high specific capacity of 645.5 mAh g−1 at current density of 1000 mA g−1 after 100 cycles. Even at high current density of 4000 mA g−1, the NiO polyhedron nanocrystals still deliver a capacity of 459.6 mAh g−1. The high specific capacity, long stable cyclic property and good rate capability make the NiO polyhedron nanocrystals a good candidate anode material for high-performance LIBs.
Co-reporter:Zhongchao Bai, Yaohui Zhang, Yuwen Zhang, Chunli Guo, Bin Tang and Di Sun
Journal of Materials Chemistry A 2015 vol. 3(Issue 10) pp:5266-5269
Publication Date(Web):14 Jan 2015
DOI:10.1039/C4TA06292B
MOFs-derived porous Mn2O3 have been synthesized by the high-temperature calcination of a metal–organic framework, [Mn(Br4-bdc)(4,4′-bpy)(H2O)2]n (Br4-bdc = tetrabromoterephthalate and 4,4′-bpy = 4,4′-bipyridine). The porous Mn2O3 as an anode material for lithium ion batteries displays excellent performances, 705 mA h g−1 after 250 cycles at 1 A g−1.
Co-reporter:Zhongchao Bai, Yuwen Zhang, Yaohui Zhang, Chunli Guo, Bin Tang
Electrochimica Acta 2015 Volume 159() pp:29-34
Publication Date(Web):20 March 2015
DOI:10.1016/j.electacta.2015.01.188
•Mesoporous leaf-like CuO was scalable synthesized using commercial Cu(OH)2 at room temperature.•The sample has a high surface area of 23.55 m2 g−1 and narrow pore distribution of 3.3 nm.•After 300 cycles, the CuO still kept a capacity of 694.7 mAh g−1 at 500 mAh g−1.Herein, leaf-like CuO with mesoporous structure has been synthesized by treating commercial Cu(OH)2 powder at room temperature for an appropriate time. The BET measurement shows that the obtained CuO has a high surface area of 23.55 m2 g−1 and narrow pore distribution peaking at about 3.3 nm. The electrochemical performances of leaf-like mesoporous CuO are evaluated by cyclic voltammetry and galvanostatic charge-discharge studies. Electrochemical results show that the as-prepared CuO are promising anode materials in LIBs including high specific capacity, good retention and rate property. Even at the high current density of 2000 mA g−1, the mesoporous CuO electrode still can maintain a specific capacity of 490.5 mAh g−1 which is much higher than the theoretical specific capacity of graphite (372 mAh g−1).
Co-reporter:Dr. Zhongchao Bai;Dr. Yaohui Zhang;Dr. Yuwen Zhang;Dr. Chunli Guo ; Bin Tang
Chemistry - A European Journal 2015 Volume 21( Issue 50) pp:18187-18191
Publication Date(Web):
DOI:10.1002/chem.201503587
Abstract
Hierarchical hybridized nanocomposites with rationally constructed compositions and structures have been considered key for achieving superior Li-ion battery performance owing to their enhanced properties, such as fast lithium ion diffusion, good collection and transport of electrons, and a buffer zone for relieving the large volume variations during cycling processes. Hierarchical MoS2@carbon microspheres (HMCM) have been synthesized in a facile hydrothermal treatment. The structure analyses reveal that ultrathin MoS2 nanoflakes (ca. 2–5 nm) are vertically supported on the surface of carbon nanospheres. The reversible capacity of the HMCM nanocomposite is maintained at 650 mA h g−1 after 300 cycles at 1 A g−1. Furthermore, the capacity can reach 477 mA h g−1 even at a high current density of 4 A g−1. The outstanding electrochemical performance of HMCM is attributed to the synergetic effect between the carbon spheres and the ultrathin MoS2 nanoflakes. Additionally, the carbon matrix can supply conductive networks and prevent the aggregation of layered MoS2 during the charge/discharge process; and ultrathin MoS2 nanoflakes with enlarged surface areas, which can guarantee the flow of the electrolyte, provide more active sites and reduce the diffusion energy barrier of Li+ ions.
Co-reporter:Zhongchao Bai, Xiangyu Zhang, Yuwen Zhang, Chunli Guo and Bin Tang
Journal of Materials Chemistry A 2014 vol. 2(Issue 39) pp:16755-16760
Publication Date(Web):2014/08/13
DOI:10.1039/C4TA03532A
In this work, porous Mn3O4 nanorods have been fabricated through the decomposition of MnOOH nanorods under an inert gas. The sample shows a high BET surface area of 27.6 m2 g−1 and a narrow pore size distribution of 3.9 nm. Because of the excellent porous geometry and one-dimensional structure, the porous Mn3O4 nanorods display outstanding electrochemical performance, such as high specific capacity (901.5 mA h g−1 at a current density of 500 mA g−1), long cycling stability (coulombic efficiency of 99.3% after 150 cycles) and high rate capability (387.5 mA h g−1 at 2000 mA g−1). Very interestingly, the porous Mn3O4 nanorods are converted to Mn3O4 following electrochemical reaction, which does not occur with nonporous Mn3O4 nanorods. The possible reason may be ascribed to the improved kinetics of the porous structure.
Co-reporter:Zhongchao Bai, Yuwen Zhang, Na Fan, Chunli Guo, Bin Tang
Materials Letters 2014 Volume 119() pp:16-19
Publication Date(Web):15 March 2014
DOI:10.1016/j.matlet.2013.12.060
•ZnO@C nanospheres have been synthesized using zinc and acetylacetone as raw materials through a one-step co-pyrolysis method.•Hollow carbon nanospheres can be obtained after removing of the internal ZnO in HCl solution.•The ZnO@C nanospheres give a reversible capacity of 440 mA h g−1 at a current density of 100 mA g−1 after 50 cycles.ZnO@C nanospheres with an average diameter of 200 nm have been synthesized using zinc (Zn) and acetylacetone as raw materials through a one-step co-pyrolysis method. The electrochemical properties of the ZnO@C nanospheres as an anode material are examined. The ZnO@C nanospheres give a reversible capacity of 440 mA h g−1 at a current density of 100 mA g−1 after 50 cycles. The improved electrochemical performance can be ascribed to the carbon shells, which not only serve as good electronic conductors but also act as good protective layers (preventing the pulverization) during lithiation/delithiation process. In addition, after removing of the internal ZnO in HCl solution, hollow carbon nanospheres can be obtained.
Co-reporter:Zhongchao Bai, Na Fan, Zhicheng Ju, Chunli Guo, Yitai Qian, Bin Tang and Shenglin Xiong
Journal of Materials Chemistry A 2013 vol. 1(Issue 36) pp:10985-10990
Publication Date(Web):19 Jul 2013
DOI:10.1039/C3TA11910F
Because of the low cost and operating potential, Mn3O4 is highly noticeable among transition metal oxides as an anode material for Li-ion batteries. Here, mesoporous Mn3O4 nanotubes with a high surface area of 42.18 m2 g−1 and an average pore size of 3.72 nm were synthesized for the first time through the hydrogen reduction of β-MnO2 nanotubes under a H2/Ar atmosphere at 280 °C for 3 h. Electrochemical results demonstrate that the reversible capacity of mesoporous Mn3O4 nanotubes is 641 mA h g−1 (much higher than the theoretical capacity of graphite, ∼372 mA h g−1) after 100 cycles at a high current density of 500 mA g−1. The superior electrochemical performance can be attributed to the unique 1D mesoporous nano-tubular structure, which offers fast and flexible transport pathways for electrolyte ions, and also provides sufficient free space to buffer the large volume change of anodes based on the conversion reaction during the repeated lithium-ion insertion/extraction. The improved electrochemical performance makes such a mesoporous Mn3O4 tubular structure promising as an anode material for next-generation lithium-ion batteries.
Co-reporter:Zhongchao Bai, Yaohui Zhang, Yuwen Zhang, Chunli Guo, Bin Tang and Di Sun
Journal of Materials Chemistry A 2015 - vol. 3(Issue 10) pp:NaN5269-5269
Publication Date(Web):2015/01/14
DOI:10.1039/C4TA06292B
MOFs-derived porous Mn2O3 have been synthesized by the high-temperature calcination of a metal–organic framework, [Mn(Br4-bdc)(4,4′-bpy)(H2O)2]n (Br4-bdc = tetrabromoterephthalate and 4,4′-bpy = 4,4′-bipyridine). The porous Mn2O3 as an anode material for lithium ion batteries displays excellent performances, 705 mA h g−1 after 250 cycles at 1 A g−1.
Co-reporter:Zhongchao Bai, Na Fan, Zhicheng Ju, Chunli Guo, Yitai Qian, Bin Tang and Shenglin Xiong
Journal of Materials Chemistry A 2013 - vol. 1(Issue 36) pp:NaN10990-10990
Publication Date(Web):2013/07/19
DOI:10.1039/C3TA11910F
Because of the low cost and operating potential, Mn3O4 is highly noticeable among transition metal oxides as an anode material for Li-ion batteries. Here, mesoporous Mn3O4 nanotubes with a high surface area of 42.18 m2 g−1 and an average pore size of 3.72 nm were synthesized for the first time through the hydrogen reduction of β-MnO2 nanotubes under a H2/Ar atmosphere at 280 °C for 3 h. Electrochemical results demonstrate that the reversible capacity of mesoporous Mn3O4 nanotubes is 641 mA h g−1 (much higher than the theoretical capacity of graphite, ∼372 mA h g−1) after 100 cycles at a high current density of 500 mA g−1. The superior electrochemical performance can be attributed to the unique 1D mesoporous nano-tubular structure, which offers fast and flexible transport pathways for electrolyte ions, and also provides sufficient free space to buffer the large volume change of anodes based on the conversion reaction during the repeated lithium-ion insertion/extraction. The improved electrochemical performance makes such a mesoporous Mn3O4 tubular structure promising as an anode material for next-generation lithium-ion batteries.
Co-reporter:Zhongchao Bai, Xiangyu Zhang, Yuwen Zhang, Chunli Guo and Bin Tang
Journal of Materials Chemistry A 2014 - vol. 2(Issue 39) pp:NaN16760-16760
Publication Date(Web):2014/08/13
DOI:10.1039/C4TA03532A
In this work, porous Mn3O4 nanorods have been fabricated through the decomposition of MnOOH nanorods under an inert gas. The sample shows a high BET surface area of 27.6 m2 g−1 and a narrow pore size distribution of 3.9 nm. Because of the excellent porous geometry and one-dimensional structure, the porous Mn3O4 nanorods display outstanding electrochemical performance, such as high specific capacity (901.5 mA h g−1 at a current density of 500 mA g−1), long cycling stability (coulombic efficiency of 99.3% after 150 cycles) and high rate capability (387.5 mA h g−1 at 2000 mA g−1). Very interestingly, the porous Mn3O4 nanorods are converted to Mn3O4 following electrochemical reaction, which does not occur with nonporous Mn3O4 nanorods. The possible reason may be ascribed to the improved kinetics of the porous structure.
