α-MnO2纳米线的制备及其在锂氧气电池中的应用

doi:10.15541/jim20180093

无机材料学报 ›› 2018, Vol. 33 ›› Issue (9): 1029-1034.DOI: 10.15541/jim20180093 CSTR: 32189.14.10.15541/jim20180093

所属专题：电催化研究；离子电池材料

• • 上一篇

α-MnO₂纳米线的制备及其在锂氧气电池中的应用

卢长健^{1, 2, 3}, 朱法权^{1, 2, 3}, 阴济光^{1, 2, 3}, 张剑波^{1, 2, 3}, 于亚伟^{1, 2, 3}, 胡秀兰^{1, 2, 3}

1. 南京工业大学材料科学与工程学院, 南京 211816;
2. 江苏先进生物与化学制造协同创新中心, 南京 211816;
3. 江苏先进无机功能复合材料协同创新中心, 南京 211816

收稿日期:2018-03-02 修回日期:2018-04-02 出版日期:2018-09-20 网络出版日期:2018-08-14
作者简介:卢长健. E-mail: 1137482429@qq.com

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)

摘要/Abstract

摘要：

锂氧气电池由于其极高的能量密度被认为是一种很有前途的储能系统。二氧化锰基材料被认为是锂空气电池阴极的低成本且高效的催化剂。在本研究中, 通过水热法合成了不同长度的α-MnO₂纳米线并对其在锂氧气电池中的电化学性能进行了研究。X射线衍射和场发射扫描电镜证实了α-MnO₂的形成。由α-MnO₂纳米线组装的锂氧气电池在电流密度为100 mA/g、放电截止电压为2 V时, 以正极总质量为计算标准, 放电容量高达12000 mAh/g。当限定放电容量为500 mAh/g时, 电池能够有效循环超过40次, 显现出良好的循环稳定性。这些结果表明, α-MnO₂纳米线可以作为锂氧气电池的催化剂。

关键词: 锂氧气电池, 正极, α-MnO₂纳米线;, 科琴黑, 放电容量

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

中图分类号:

TQ174

卢长健, 朱法权, 阴济光, 张剑波, 于亚伟, 胡秀兰. α-MnO₂纳米线的制备及其在锂氧气电池中的应用[J]. 无机材料学报, 2018, 33(9): 1029-1034.

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.

图/表 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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α-MnO₂纳米线的制备及其在锂氧气电池中的应用

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

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