| 高性能的钛掺杂O3相O3-Na1-xCr1-xTixO2(x=0, 0.03, 0.05)用于钠离子电池正极材料的研究 |
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| 引用本文： | 邵 宇,唐仲丰,廖家英,陈春华.高性能的钛掺杂O3相O3-Na1-xCr1-xTixO2(x=0, 0.03, 0.05)用于钠离子电池正极材料的研究[J].化学物理学报,2018,31(5):673-676. |
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| 作者姓名： | 邵 宇 唐仲丰 廖家英 陈春华 |
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| 作者单位： | 中国科学技术大学材料科学与工程系，合肥 230026,中国科学技术大学材料科学与工程系，合肥 230026,中国科学技术大学材料科学与工程系，合肥 230026,中国科学技术大学材料科学与工程系，合肥 230026 |
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| 摘 要： | 本文通过凝胶热聚合路线合成了层状的O3相正极材料Na1-xCr1-xTixO2(x=0, 0.03, 0.05)，采用X射线衍射、扫描电子显微镜来分析其晶体结构和微观形貌. 研究发现，适量的钛掺杂有助于形成更均匀的颗粒并且会改变样品的颜色. 作为钠离子电池正极材料，Na//Na0.97Cr0.97Ti0.03O2具有非常高的库伦效率(首次高于96%)，并且在2.0-3.6 V的电化学窗口下，用0.2 C的倍率循环100次，只有4%的容量衰减；在32 C倍率下有110 mAh/g的比容量.
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| 关 键 词： | 铬酸钠，掺杂，钠离子电池，层状氧化物，正极 |
| 收稿时间： | 2018/2/1 0:00:00 |
Layer-Structured Ti Doped O3-Na1-xCr1-xTixO2(x=0, 0.03, 0.05) with Excellent Electrochemical Performance as Cathode Materials for Sodium Ion Batteries |
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| Yu Shao,Zhong-feng Tang,Jia-ying Liao and Chun-hua Chen.Layer-Structured Ti Doped O3-Na1-xCr1-xTixO2(x=0, 0.03, 0.05) with Excellent Electrochemical Performance as Cathode Materials for Sodium Ion Batteries[J].Chinese Journal of Chemical Physics,2018,31(5):673-676. |
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| Authors: | Yu Shao Zhong-feng Tang Jia-ying Liao and Chun-hua Chen |
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| Institution: | CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, University of Science and Technology of China, Hefei 230026, China,CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, University of Science and Technology of China, Hefei 230026, China,CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, University of Science and Technology of China, Hefei 230026, China and CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, University of Science and Technology of China, Hefei 230026, China |
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| Abstract: | Layer-structured O3 type cathode materials Na1-xCr1-xTixO2(x=0, 0.03, 0.05) are fabricated by a thermo-polymerization method. The structures and morphologies are characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) respectively. It has been found that the appropriate Ti doping effectively leads to the formation of uniform morphology. As a cathode, the x=0.03 sample delivers a quite high discharge capacity of 110 mAh/g at 32 C in the voltage range from 2.0 V to 3.6 V (vs. Na/Na+) and with a capacity retention of 96% after 100 cycles at 0.2 C. The Na//Na0.97Cr0.97Ti0.03O2 cell exhibits very high coulombic e ciency (above 96%). All these results suggest that Na0.97Cr0.97Ti0.03O2 is very promising for high-rate sodium ion batteries. |
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| Keywords: | Sodium chromium oxide Doping Sodium ion battery Layered oxide Cathode |
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