Insights into the Ti4+ doping in P2-type Na0.67Ni0.33Mn0.52Ti0.15O2 for enhanced performance of sodium-ion batteries
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第15期
论文作者：Shi Tao Wei Zhou Dajun Wu Zhicheng Wang Bin Qian Wangsheng Chu Augusto Marcelli Li Song
摘 要：Due to the sodium abundance and availability, sodium-ion batteries（SIBs） have the potential to meet the worldwide growing demand of electrical energy storage. P2-type sodium transition-metal layer oxides with a high energy density are considered as the most promising cathode materials for SIBs. We present here a detailed study of the enhanced rate capability and cyclic stability of the Ti-doped Na0.67Ni0.33Mn0.67O2 cathode material. The combined analysis of ex-situ X-ray absorption fine structure（XAFS） spectroscopy, aberration-corrected high resolution transmission electron microscopy（AB-HRTEM） and X-ray diffraction（XRD） show that the strong Ti–O bond in the transition metal layers stabilizes the local structure, destroy the Na+-vacancy ordering and arrest the irreversible multiphase transformation that occurs during the intercalation/deintercalation process.Actually, Na0.67Ni0.33Mn0.52Ti0.15O2 exhibits a reversible capacity of 89.6 mA h g-1 even at 5 C, an excellent cyclability with 88.78 % capacity retention after 200 cycles at 0.5 C. This study provides a better understanding in optimization of the design of high-energy cathode materials based on titanium doped layered oxides for SIBs.
Shi Tao1，Wei Zhou1，Dajun Wu1，Zhicheng Wang1，Bin Qian1，Wangsheng Chu2，Augusto Marcelli3，Li Song2
1. School of Electronic and Information Engineering, Jiangsu Laboratory of Advanced Functional Materials, Changshu Institute of Technology2. National Synchrotron Radiation Laboratory, University of Science and Technology of China3. INFN-Laboratori Nazionali di Frascati
摘 要：Due to the sodium abundance and availability, sodium-ion batteries（SIBs） have the potential to meet the worldwide growing demand of electrical energy storage. P2-type sodium transition-metal layer oxides with a high energy density are considered as the most promising cathode materials for SIBs. We present here a detailed study of the enhanced rate capability and cyclic stability of the Ti-doped Na0.67Ni0.33Mn0.67O2 cathode material. The combined analysis of ex-situ X-ray absorption fine structure（XAFS） spectroscopy, aberration-corrected high resolution transmission electron microscopy（AB-HRTEM） and X-ray diffraction（XRD） show that the strong Ti–O bond in the transition metal layers stabilizes the local structure, destroy the Na+-vacancy ordering and arrest the irreversible multiphase transformation that occurs during the intercalation/deintercalation process.Actually, Na0.67Ni0.33Mn0.52Ti0.15O2 exhibits a reversible capacity of 89.6 mA h g-1 even at 5 C, an excellent cyclability with 88.78 % capacity retention after 200 cycles at 0.5 C. This study provides a better understanding in optimization of the design of high-energy cathode materials based on titanium doped layered oxides for SIBs.
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