对Na2.24FePO4CO3作为钠离子电池正极材料的详细研究。
Detailed investigation of Na2.24FePO4CO3 as a cathode material for Na-ion batteries.
作者信息
Huang Weifeng, Zhou Jing, Li Biao, Ma Jin, Tao Shi, Xia Dingguo, Chu Wangsheng, Wu Ziyu
机构信息
1] National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230029, P. R. China [2] Key lab of theory and technology for advanced batteries materials, College of Engineering, Peking University, Beijing 100871, P. R. China [3] Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, P. R. China.
Chinese Academy of Sciences, Shanghai Institute Applied Physics, Shanghai 201204, P. R. China.
出版信息
Sci Rep. 2014 Mar 5;4:4188. doi: 10.1038/srep04188.
Na-ion batteries are gaining an increased recognition as the next generation low cost energy storage devices. Here, we present a characterization of Na3FePO4CO3 nanoplates as a novel cathode material for sodium ion batteries. First-principles calculations reveal that there are two paths for Na ion migration along b and c axis. In-situ and ex-situ Fe K-edge X-ray absorption near edge structure (XANES) point out that in Na3FePO4CO3 both Fe(2+)/Fe(3+) and Fe(3+)/Fe(4+) redox couples are electrochemically active, suggesting also the existence of a two-electron intercalation reaction. Ex-situ X-ray powder diffraction data demonstrates that the crystalline structure of Na3FePO4CO3 remains stable during the charging/discharging process within the range 2.0-4.55 V.
钠离子电池作为下一代低成本储能设备正日益受到认可。在此，我们展示了对Na3FePO4CO3纳米片作为钠离子电池新型阴极材料的表征。第一性原理计算表明，钠离子沿b轴和c轴迁移有两条路径。原位和非原位Fe K边X射线吸收近边结构（XANES）指出，在Na3FePO4CO3中，Fe(2+)/Fe(3+)和Fe(3+)/Fe(4+)氧化还原对均具有电化学活性，这也表明存在双电子嵌入反应。非原位X射线粉末衍射数据表明，Na3FePO4CO3的晶体结构在2.0 - 4.55 V范围内的充放电过程中保持稳定。
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