Method for producing positive electrode material for secondary battery

• Main Authors: CAI FENGYAN, HONG JINGZHE, XIE HANWEI
• Format: Patent
• Language: Chinese; English
• Published: 08.12.2020
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention provides a method for producing a positive electrode material for a secondary battery. The method is used for producing a carbon-coated fluorine-containing positive electrode material for a secondary battery. The method comprises the following steps: (a) providing a precursor with carbon coating and fluoride containing alkali metal to form secondary particles; (b) providing a closedsystem which is provided with a containing space, wherein the containing space is filled with the secondary particles, and the volume filling rate of the secondary particles in the containing space islarger than 30%; and (c) carrying out heat treatment at a temperature of 300-900 DEG C in a non-oxidizing environment to produce the positive electrode material. The carbon-coated and fluorine-containing positive electrode material for the secondary battery is produced with the volume filling rate of more than 30 percent through the closed system, so that a single crystal phase can be obtained, the product conversion rate