钠离子电池锰酸钠正极材料研究进展与发展趋势

In recent years, sodium-ion batteries have been regarded as the best and most promising complement to lithium-ion batteries at present, as well as one of the most promising systems for their future development of large-scale electrochemical energy storage, owing to a number of advantages including abundant sodium raw material reserves, wide distribution, low price, green sustainability, safety and stability, high integration efficiency, excellent fast charging performance, and good low temperature performance. However, the factors that hinder the development of sodium ion batteries are the cathode material architecture is prone to phase change, the discharge specific capacity is not very high, and the cycle performance is not very good. At present, the research on cathode materials for sodium ion batteries has shown more diverse structural types, excellent structural stability, higher specific capacity, good charge/discharge cycling performance and other excellent electrochemical properties of transition metal oxide materials. In this paper, we summarize the progress of the research on the microstructure and macrostructure of sodium manganate cathode materials, focusing on the systematic and in-depth study of sodium manganate materials with different sodium contents by means of doping and coating at three different sites (sodium, manganese and oxygen sites), and the gain buff effects brought about by the doping of different elements, doping at different sites and different coating methods are demonstrated and discussed in detail. In the future development process, we should strengthen the further improvement of the micro and macro structure, expand the multi-element, multi-site doping types, doping ratios, matching types and coating material types, etc., improve the coating technology, and continuously strengthen the innovation and development of accessories such as sodium-ion battery electrolyte and anode materials.