Preparation method of NCM ternary positive electrode material capable of reducing DCR

• Main Authors: QIAN ZHITING, WANG YINFENG, MAO QINZHONG, ZAN XUEJUN, XU WANRUN, WU HAIJUN, PENG HAILING, WANG BO, TIAN JUNWU
• Format: Patent
• Language: Chinese; English
• Published: 03.02.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention relates to the technical field of new energy automobile lithium ion power batteries, in particular to a preparation method of an NCM ternary positive electrode material capable of reducing DCR. The method comprises the following steps: (1) mixing a nickel source, a cobalt source, a manganese source and lithium carbonate, adding a doping agent, carrying out dry mixing, and carrying out primary sintering to obtain a single crystal primary sintering product; and (2) carrying out dry coating on the single crystal primary sintering product and a specifically designed coating agent according to a certain proportion, carrying out secondary sintering coating, and treating to obtain the single crystal NCM ternary positive electrode material with the DCR lower than that of a substrate. According to the method, conventional dry coating and a specific coating process are adopted, the effect of reducing the DCR of the positive electrode material is achieved, the method has certain reference significance in m