ADDITIVE FOR SUPPLEMENTING LITHIUM TO POSITIVE ELECTRODE, AND PREPARATION METHOD THEREFOR AND USE THEREOF

• Main Authors: KONG, Lingyong, ZHONG, Wen, WAN, Yuanxin, ZHU, Chengben, LIN, Lvhuan
• Format: Patent
• Language: English; French; German
• Published: 25.09.2024
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

A cathode lithium-supplementing additive, a preparation method, and an application thereof are provided. The cathode lithium-supplementing additive includes: a lithium-containing core, and a cladding layer formed on a surface of the lithium-containing core, in which, a material of the cladding layer is selected from a conductive hydrophobic polymer having a surface modified with a hydrophobic enhancer. On the one hand, the formed cladding layer can make up for the defect like poor electronic conductivity of the lithium-containing compound and improve the electronic conductivity, in the meanwhile, the cladding layer can act as a conductive agent in the electrode plate and thus reduce the amount of conductive agent to be added to the electrode plate; and on the other hand, since the polymer has the surface modified with the hydrophobic enhancer, hydrophobic groups are provided, which further provides a hydrophobic barrier, so as to effectively improve the stability of the lithium-containing core in the air, to effectively block moisture and carbon dioxide in the air from contacting or reacting with the lithium-supplementing material in the core, to prevent the lithium-containing compound from reacting with water or being defective, and to protect the stability of the lithium-supplementing material.