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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| Authors: | Yu Shao Zhong-feng Tang Jia-ying Liao Chun-hua Chen |
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| Affiliation: | 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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