期刊
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
卷 26, 期 1, 页码 269-280出版社
SPRINGER
DOI: 10.1007/s10008-021-05067-w
关键词
Ti doping; P2-type Na0 71Co0 96O2; Sodium ions batteries; Cathode; Electrochemical properties
This study synthesized P2-type Na0.71Co0.96-xTixO2 (x = 0, 0.057, 0.073, 0.09) electrode materials, and found that the performance of Na0.71Co0.96-xTixO2 (x = 0.073) was superior with high initial discharge capacity and stable cycling performance.
The electrode materials with long cycle life are important for the large-scale application of sodium ion batteries. In this work, P2-type Na0.71Co0.96-xTixO2 (x = 0, 0.057, 0.073, 0.09) were synthesized by molten-salt method. The Ti doping content could influence the crystallographic unit cell volume, particle size, oxygen vacancies, and surface charge density of those samples. When x = 0.073, the P2-type Na0.71Co0.96-xTixO2 (x = 0.073) exhibits superior reversible capacity and rate performance due to the appropriate synergistic effect. In particular, the initial discharge capacity of NCTO-0.073 is about 118.5 mAh g(-1) at 100 mA g(-1). Even the current density gets to 1000 mA g(-1), the initial discharge capacity remains 71.7 mAh g(-1) after 1000 cycling with the capacity retention of 67.90%. The electrochemical kinetics analysis further prove that the P2-type Na0.71Co0.96-xTixO2 (x = 0.073) owns outstanding electrical conductivity and fast sodium ion diffusion behavior to promote the electrochemical reaction during the charging/discharging. These results will contribute to the industrialized application of stable high-performance cathodes for sodium ion batteries.
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