Sodium ion positive electrode material, sodium ion battery and preparation method and application of sodium ion battery

The invention discloses a sodium ion positive electrode material, a sodium ion battery and a preparation method and application thereof, and relates to the technical field of sodium ion batteries. The inventor creatively makes a certain amount of lithium exist in a sodium-ion battery system, and the lithium occupies a sodium site and performs energy storage and conversion together with sodium. Compared with sodium ions, lithium ions have smaller radius size and higher migration rate in the positive electrode and the negative electrode, so that the energy storage and conversion device taking sodium as a main body can obtain higher discharge rate performance. 本发明公开了钠离子正极材料、钠离子电池及其制备方法和应用，涉及钠离子电池技术领域。发明人创造性地使钠离子电池体系中存在一定的锂，并使锂占据钠位，与钠并行进行能量的存储与转化。相比钠离子，锂离子具有更小的半径尺寸，在正负极内的迁移速率更快，能够让以钠为主体的能量存储与转化装置获取更高的放电倍率性能。