Synthesis of α-MnO2 Nanowires via Facile Hydrothermal Method and Their Application in Li-O2 Battery

doi:10.15541/jim20180093

Journal of Inorganic Materials ›› 2018, Vol. 33 ›› Issue (9): 1029-1034.DOI: 10.15541/jim20180093

Synthesis of α-MnO₂ Nanowires via Facile Hydrothermal Method and Their Application in Li-O₂ Battery

LU Chang-Jian^{1, 2, 3}, ZHU Fa-Quan^{1, 2, 3}, Yin Ji-Guang^{1, 2, 3}, ZHANG Jian-Bo^{1, 2, 3}, YU Ya-Wei^{1, 2, 3}, HU Xiu-Lan^{1, 2, 3}

1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, China;
2. The Synergetic Innovation Center for Advanced Materials, Nanjing 211816, China;
3. Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing 211816, China

Received:2018-03-02 Revised:2018-04-02 Published:2018-09-20 Online:2018-08-14
About author:LU Chang-Jian (1992-), male, candidate of Master degree. E-mail: 1137482429@qq.com
Supported by:
National Natural Science Foundation of China (51372113, 51772148);Top-notch Academic Programs Project of Jiangsu Higher Education Institutions (TAPP, PPZY2015B128);Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)

Abstract

Abstract:

Li-O₂ batteries are regarded as a promising energy storage system for their extremely high energy density. MnO₂-based materials are recognized as efficient and low-cost catalyst for a Li-O₂battery positive electrode material. In this work, α-MnO₂nanowires were successfully synthesized by a hydrothermal method and their electrocatalytic performance were investigated in Li-O₂ batteries. X-ray diffraction and field emission scanning electron microscope confirms the formation of α-MnO₂. The Li-O₂ battery which consists of α-MnO₂ nanowires shows a high discharge capacity up to 12000 mAh•g^-1 at a restrict voltage of 2.0 V with the current density of 100 mA•g^-1. When restricting the discharge capacity at 500 mAh•g^-1, it can operate over 40 cycles and exhibit good cycle stability. These results indicate that the α-MnO₂nanowires can be used as positive electrode catalysts for Li-O₂ batteries.

Key words: Li-O₂ battery, positive electrode, α-MnO₂ nanowires;, Ketjen Black, discharge capacity

CLC Number:

TQ174

LU Chang-Jian, ZHU Fa-Quan, Yin Ji-Guang, ZHANG Jian-Bo, YU Ya-Wei, HU Xiu-Lan. Synthesis of α-MnO₂ Nanowires via Facile Hydrothermal Method and Their Application in Li-O₂ Battery[J]. Journal of Inorganic Materials, 2018, 33(9): 1029-1034.

Figures/Tables 5

Fig. 1 XRD pattern of α-MnO2 sample

Fig. 2 FE-SEM images of the α-MnO2 nanowires with different magnification

Fig. 3 First discharge capacity of the positive electrode with different weight ratio of α-MnO2 nanowires and KB at a constant current density of 100 mA•g-1

Fig. 4 Charge-discharge curves of Li-O2 batteries with (a) KB, (b) α-MnO2/KB (1 : 2), with (c) the comparison of the first discharge curves of pure KB and α-MnO2/KB (1 : 2) and (d) the comparison of cyclic performance

Fig. 5 First full discharge curves of Li-O2 batteries with α-MnO2/KB (1 : 2) at current densities of 100 mA•g-1, 200 mA•g-1, 400 mA•g-1 and 800 mA•g-1

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Synthesis of α-MnO₂ Nanowires via Facile Hydrothermal Method and Their Application in Li-O₂ Battery

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