Sodium-ion battery positive electrode material as well as preparation method and application thereof

• Main Authors: WANG CHANGMEI, YANG YINGCHANG, TIAN KEYAN, LI ZHUPING, NA KANG-HOON, LUO XINGHUAI
• Format: Patent
• Language: Chinese; English
• Published: 10.05.2024
• 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 provides a sodium-ion battery positive electrode material as well as a preparation method and application thereof, and relates to the technical field of sodium-ion batteries. Specifically, the sodium ion battery positive electrode material comprises a positive electrode active material and a chromate compound film coating the surface of the positive electrode active material, wherein the chromate compound comprises at least one of barium chromate, ammonium chromate, strontium chromate or potassium chromate. The surface of the sodium-ion battery positive electrode active material is coated with a layer of chromate compound film, so that side reaction between the positive electrode active material and electrolyte and manganese dissolution can be effectively blocked, meanwhile, the structural stability of the positive electrode material is also improved, the capacity and cycling stability of the sodium-ion battery can be effectively improved, and the service life of the sodium-ion battery is prolon