Flexible polymer coated modified ternary positive electrode material and preparation method and application thereof

• Main Authors: LI SHOULING, FENG CHANGYUN, GAO YUXIAN, GAO MINGHAO
• Format: Patent
• Language: Chinese; English
• Published: 29.09.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention discloses a flexible polymer coated modified ternary positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The preparation method comprises the following steps: coating hafnium hydroxide on the surface of a ternary precursor, and then mixing and sintering with a lithium source to obtain the modified ternary positive electrode material, and reacting the modified ternary positive electrode material with hafnium oxide modified reduced graphene oxide, and then reacting the obtained material with polyisosorbide terephthalate polyester glycol and isocyanate to obtain the flexible polymer coated modified ternary positive electrode material. Through the synergistic effect of flexible polymer coating and hafnium element doping, microcrack generation and expansion of the ultrahigh nickel (Ni content is greater than or equal to 0.90) ternary positive electrode material under high temperature and long circulation are