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电化学(中英文) ›› 2014, Vol. 20 ›› Issue (3): 201-205.  doi: 10.13208/j.electrochem.140401

• 研究快讯 • 上一篇    下一篇

钠离子电池正极材料Na2MnPO4F的23Na MAS NMR谱研究

侯旭,钟贵明,林晓琛,刘子庚,吴晓彪,杨勇*   

  1. 厦门大学 化学化工学院化学系,固体表面物理化学国家重点实验室,福建 厦门 361005
  • 收稿日期:2014-04-01 修回日期:2014-04-14 出版日期:2014-06-28 发布日期:2014-04-21
  • 通讯作者: 杨勇 E-mail:yyang@xmu.edu.cn
  • 基金资助:

    973国家重点基础研究发展计划(No. 2011CB935903)和国家自然科学基金(No. 21233004、No. 21021002)项目资助

23Na MAS NMR Spectroscopic Study of Na2MnPO4F as Cathode Material for Sodium-Ion Battery

HOU Xu, ZHONG Gui-ming, LIN Xiao-chen, LIU Zi-geng, WU Xiao-biao, YANG Yong*   

  1. State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China
  • Received:2014-04-01 Revised:2014-04-14 Published:2014-06-28 Online:2014-04-21
  • Contact: YANG Yong E-mail:yyang@xmu.edu.cn

摘要: Na2MnPO4F材料是一种很有发展前景的钠离子电池正极材料,本文通过非原位XRD和固体核磁共振技术研究该材料充放电结构变化(晶体结构与局域Na位). 非原位XRD测试发现,充电过程在2θ为31o和36o左右出现新的衍射峰,表明钠脱出后电极上有中间相物质生成. 23Na MAS NMR谱图的-209 ppm、-258 ppm和-295 ppm三个谱峰分别对应于该材料结构中Na1 + Na2位、Na3位和Na4位. 非原位23Na MAS NMR谱研究发现,充电过程中-209 ppm处信号峰面积比例减小,表明Na1和Na2位的Na比Na3和Na4位先脱出. 充电至4.2 V,-132 ppm和-330 ppm处出现中间相物质的信号峰;而放电过程则相反.

关键词: 钠离子电池, 正极材料, Na2MnPO4F, 23Na MAS NMR

Abstract: The Na2MnPO4F is one of the promising cathode materials for the sodium ion batteries. In the paper, we employed the ex situ X-ray diffraction and solid state NMR techniques to study the charge and discharge processes of this material, including the crystal structure and sodium sites changes. The ex situ x-ray diffraction patterns showed that two new diffraction peaks could be observed at 31o and 36o indicating an intermediate phase formed with the extraction of Na+. From the 23Na MAS NMR spectrum of the material, three peaks were seen at -209 ppm,-258 ppm and -295 ppm, which can be assigned to Na1 + Na2, Na3 and Na4 sites in the crystal structure, respectively. The ex situ solid state NMR study demonstrated that the Na+ in Na1 and Na2 sites deintercalated firstly compared to Na3 and Na4 sites. The signal peaks of intermediate phase appeared at -132 ppm and -330 ppm when charging to 4.2 V. The opposite phenomenon occurred during the discharge process.

Key words: sodium ion batteries, cathode material, Na2MnPO4F, 23Na MAS NMR

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