Nickel full-gradient single-crystal ternary positive electrode material as well as preparation method and application thereof

• Main Authors: SHEN KEFAN, YAO JUMING, WANG YINFENG, MAO QINZHONG, CAI YURONG, JI TONGZONG, GUO XUANNAN, LU XIAOXIAO
• Format: Patent
• Language: Chinese; English
• Published: 14.11.2023
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention discloses a nickel full-gradient single-crystal ternary positive electrode material and a preparation method and application thereof, high-nickel ternary positive electrode material primary particles are used as seed crystals, and the single-crystal ternary positive electrode material with nickel element full-gradient distribution is prepared through epitaxial growth. The method has the advantages that the process steps are simple, the cost is relatively low, and the performance advantages of gradient and single crystal ternary positive electrode materials can be synthesized. The prepared nickel element gradient distribution single crystal ternary positive electrode material has the advantages of uniform particle size, good thermal stability, good structural stability, good lithium storage cycle performance, long service life and the like; and compared with the seed crystal raw material, the average grain size can be increased by more than two times. Meanwhile, the nickel element of the single-c