Influence of oxygen percentage in calcination atmosphere on structure and electrochemical properties of LiNi0.8Co0.1Mn0.1O2 cathode material for lithium-ion batteries |
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| Affiliation: | 1. School of Chemistry and Chemical Engineering, Harbin Institute of Technology, No.92 West-Da Zhi Street, Harbin, 150001, China;2. Praxair (China) Investment Corporation, No. 855 Jinyu Road, Pudong New District, Shanghai, 201206, China;3. State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute (LSMRI), No. 149-1 Zhuzhou Road, Qingdao, 266101, China;1. School of Chemical Engineering and Technology, Harbin Institute of Technology, No. 92 West-Da Zhi Street, Harbin 150001 China;2. College of chemical and chemical engineering, Harbin Normal University, Harbin, Heilongjiang 150025, China;3. Xi׳an Huijie Industrial Co., Ltd., Xi׳an 710116 China;1. School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang, Hebei, 050018, PR China;2. Hebei Key Laboratory of Material Near-Net Forming Technology, Hebei University of Science and Technology, Shijiazhuang, Hebei, 050018, PR China;1. School of Material Science and Engineering, Beijing Key Laboratory of Environmental Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China;2. Collaborative Innovation Center for Electric Vehicles in Beijing, Beijing, 100081, China;3. School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, China |
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| Abstract: | Different calcination atmospheres of air, 50% oxygen (vs. N2) and pure oxygen have been used to prepare special LiNi0.8Co0.1Mn0.1O2 cathode materials to observe the influence of oxygen composition. To investigate the structure and electrochemical property of the samples using different oxygen compositions, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), cycling performance tests and electrochemical impedance spectroscopy (EIS) were carried out. XRD, SEM, and XPS results show that the sample made using higher oxygen composition has less cation mixing and lower levels of Ni2+. However, both samples have almost the same oxygen environments on their surfaces as well as micro-morphology and size. The sample with a higher oxygen composition shows better electrochemical performance. Interestingly, the electrochemical performance of the sample made using 50% oxygen is similar to that made with pure oxygen and much better than the sample made with air. It has a specific capacity of 202.4 mAh g−1 at 0.1C and a capacity retention of 85.2% after 300 cycles at 1C, which may be meaningful for balancing cost and performance. |
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| Keywords: | Calcination oxygen percentage Cation mixing Cost and performance |
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