期刊
CHINESE JOURNAL OF CHEMICAL PHYSICS
卷 31, 期 5, 页码 673-676出版社
CHINESE PHYSICAL SOC
DOI: 10.1063/1674-0068/31/cjcp1802013
关键词
Sodium chromium oxide; Doping; Sodium ion battery; Layered oxide; Cathode
资金
- National Natural Science Foundation of China Academy of Engineering Physics
- National Natural Science Foundation of China [51577175]
- Education Ministry of Anhui Province
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 efficiency (above 96%). All these results suggest that Na0.97Cr0.97Ti0.03O2 is very promising for high-rate sodium ion batteries.
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