钠离子电池新型Cu基隧道型氧化物正极材料研究

doi:10.6023/A16080424

化学学报 ›› 2017, Vol. 75 ›› Issue (2): 218-224.DOI: 10.6023/A16080424 上一篇下一篇

所属专题：先进电池材料

研究论文

钠离子电池新型Cu基隧道型氧化物正极材料研究

刘丽露, 戚兴国, 胡勇胜, 陈立泉, 黄学杰

中国科学院大学物理科学学院中国科学院物理研究所北京 100190

投稿日期:2016-08-21 修回日期:2016-11-10 发布日期:2016-11-24
通讯作者: 胡勇胜,E-mail:yshu@ihpy.ac.cn;Tel.:010-82649808;Fax:010-82649046 E-mail:yshu@ihpy.ac.cn
基金资助:
项目受国家自然科学基金（Nos.51222210和11234013）和中国科学院百人计划资助.

Novel Cu Based Oxides with Tunnel Structure as Cathode for Sodium-ion Batteries

Liu Lilu, Qi Xingguo, Hu Yongsheng, Chen Liquan, Huang Xuejie

School of Physical Sciences, University of Chinese Academy of Sciences, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Received:2016-08-21 Revised:2016-11-10 Published:2016-11-24
Contact: 10.6023/A16080424 E-mail:yshu@ihpy.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Nos. 51222210 and 11234013), and One Hundred Talent Project of the Chinese Academy of Sciences.

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摘要/Abstract

成本较为低廉的钠离子电池成为储能领域的新秀，备受关注.以Na₂CO₃，CuO，Fe₂O₃，MnO₂和TiO₂为原料，通过简单的固相反应法合成了一系列新型Cu基隧道结构化合物.通过X射线衍射（XRD）、扫描电子显微镜（SEM）和电化学性能测试对所得样品的结构、形貌以及电化学性能进行了表征.XRD结果表明材料结构与Na_0.44MnO₂一样为隧道结构，空间群为pbam.室温下的电化学性能测试表明Mn替代的样品在1.5~4.1 V的范围内表现出了90 mAh/g的比容量，循环稳定，倍率性能较好，1C容量保持率仍为74%.XPS结果验证了Cu在充放电过程中参与了变价.原位XRD结果表明Na_0.66Cu_0.17Mn_0.33Ti_0.5O₂电极材料在1.5~4.1 V的范围内可以保持稳定的隧道型结构.本工作首次报道了Cu在隧道型结构材料中的变价行为，为进一步设计隧道结构的材料以及钠离子电池正极材料提供新思路.

关键词: Cu³⁺/Cu²⁺氧化还原电对, 层状结构, 隧道结构, 钠离子电池

Lithium-ion batteries have dominated the electronic and portable device market, since its commercialization in 1990s. However, the cost gets boosted because of the shortage and uneven distribution of lithium. Due to the advantage of cost compared with lithium-ion batteries, sodium-ion batteries are considered as the potential candidates for large scale energy storage systems. Cu based tunnel type materials were first synthesized through simple solid state reaction, with Na₂CO₃, CuO, Fe₂O₃, MnO₂ and TiO₂ as starting materials. These raw materials were weighed and grounded in an agate mortar, followed by heat treatment at 950℃ for 24 h in air. The obtained samples were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical performance test. The XRD results demonstrate the tunnel structure was formed with space group pbam (the same with Na_0.44MnO₂) for each compound. SEM observation manifests that the distribution of particle size is from several hundred of nanometers to several micrometers. The specifically designed compound with Mn substitution (Na_0.66Cu_0.17Mn_0.33Ti_0.50O₂) can deliver 90 mAh/g cycled between 1.5~4.1 V. Good cycling stability was verified for this compound, of which 90% of its capacity maintained after 50 cycles at 0.1C rate. Moreover, the rate capability is also good and 74% of its capacity remained when cycled at 1C rate. Charge transfer mechanism was studied by X-ray photoelectron spectroscopy (XPS), and the electroactivity of Cu³⁺/Cu²⁺ in this tunnel structure was proved. In addition, we also performed in-situ XRD in order to examine the structure change during sodium extraction and intercalation. Only solid solution reaction took place during the test with shift of peaks or change of the peaks' intensity, however without the appearance of new peaks or disappearance of existed peaks. Here we report, for the first time, the electroactivity of Cu³⁺/Cu²⁺ in tunnel type structure. Our results provide new insights in designing tunnel type compound as cathode material for sodium-ion batteries.

Key words: Cu³⁺/Cu²⁺ redox couple, layered structure, tunnel structure, sodium-ion batteries

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刘丽露, 戚兴国, 胡勇胜, 陈立泉, 黄学杰. 钠离子电池新型Cu基隧道型氧化物正极材料研究[J]. 化学学报, 2017, 75(2): 218-224.

Liu Lilu, Qi Xingguo, Hu Yongsheng, Chen Liquan, Huang Xuejie. Novel Cu Based Oxides with Tunnel Structure as Cathode for Sodium-ion Batteries[J]. Acta Chim. Sinica, 2017, 75(2): 218-224.

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钠离子电池新型Cu基隧道型氧化物正极材料研究

Novel Cu Based Oxides with Tunnel Structure as Cathode for Sodium-ion Batteries

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