Layered oxide positive electrode material of oxygen variable valence sodium ion battery and preparation method of layered oxide positive electrode material

• Main Authors: WANG MENGZHEN, XIA JINFANG, ZHU RONGZHEN, WANG CHUANWEI, DONG YAXIN, LI QINGCAN, LIU HAIQIANG, LI FABING, DU YUTAO, LI BINGLIN
• Format: Patent
• Language: Chinese; English
• Published: 08.12.2023
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention discloses an oxygen-variable valence sodium ion battery layered oxide positive electrode material and a preparation method thereof, the chemical formula of the oxygen-variable valence sodium ion battery layered oxide positive electrode material is NaxLiyMzMn1-y-zO2, and M is a combination of any one of Al, Ce, La, Sn and Y and a Co element. According to the preparation method provided by the invention, one part of doped elements enter material lattices, and the other part of doped elements appear on the surface of the positive electrode material, so that the concentration of residual alkali of the positive electrode material is remarkably reduced, and further generation of the residual alkali is prevented. The positive electrode material provided by the invention shows excellent rate capability and cycle performance in a constant-current charging and discharging process, the reversible mass specific capacity at a potential window of 2.0-4.5 V is about 180.2-185.9 mAh/g, and the layered positive