Research Progress on Cathode Materials for sodium-ion batteries

In recent years, the new energy industry has developed rapidly, and sodium-ion batteries (Hereinafter referred to SIB) is becoming the new favorite in the industry due to their lower cost and higher safety. This article mainly discusses the advantages and disadvantages of SIB and the research progress of cathode materials that have the greatest impact on the performance of SIB. SIB with polyanionic compound cathodes have the advantages of good stability, cycle performance and safety, but its specific capacity is low and its conductivity is poor. Layered oxide materials have the advantage of high specific capacity and high compatibility with lithium battery ternary cathode process equipment. It is also the fastest technical route for industrialization at present. However, due to the deintercalation process of sodium ions, the layered metal oxide is prone to structural changes or phase transformations, resulting in the degradation of battery cycle performance. Prussian blue cathode materials are easy to synthesize, Na+ migrates quickly, and the battery capacity is large, but its battery capacity is prone to rapid decline. In general, sodium-ion batteries have good development prospects, but there are still some problems waiting for researchers to solve. This article summarizes the current research progress and problems that need to be solved on cathode materials for sodium-ion batteries, hoping to provide new ideas for researchers.