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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
Yu Shao,Zhong-feng Tang,Jia-ying Liao,Chun-hua Chen
Author NameAffiliationE-mail
Yu Shao 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  
Zhong-feng Tang 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  
Jia-ying Liao 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  
Chun-hua Chen 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 cchchen@ustc.edu.cn 
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.
Key words:  Sodium chromium oxide, Doping, Sodium ion battery, Layered oxide, Cathode
FundProject:
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
邵 宇,唐仲丰,廖家英,陈春华*
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.
关键词:  铬酸钠,掺杂,钠离子电池,层状氧化物,正极
DOI:10.1063/1674-0068/31/cjcp1802013
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