Carbon-coated positive electrode material, preparation method thereof and lithium ion battery

• Main Authors: SONG SHUNLIN, NI CHUANGJIANG, LIU YAFEI, XU YAWEN, ZHANG JIE, ZHU CHENYI, ZHANG XUEQUAN, CHEN YANBIN
• Format: Patent
• Language: Chinese; English
• Published: 03.10.2023
• 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 lithium ion batteries, in particular to a carbon-coated positive electrode material, a preparation method thereof and a lithium ion battery. The carbon-coated positive electrode material comprises an inner core and a carbon layer, the inner core is a high-nickel positive electrode material, and the carbon layer contains a carbon material; wherein the carbon layer is physically adsorbed on the surface layer of the inner core, the roughness delta of the inner core is 0.1-0.45, the definition of the roughness delta is as shown in a formula I # imgabs0 # formula I, Vb is the specific surface area BET, m < 2 >/g of the inner core, and Vc is the specific surface area BET, m < 2 >/g of the inner core. Wa is the apparent density of the inner core, g/cm < 3 >. According to the carbon-coated positive electrode material, on the premise that the original structure of a high-nickel positive electrode material is maintained, direct contact between the positive electrode mater