Double-metal-element modified single-crystal high-nickel coated cathode material and preparation method thereof

• Main Authors: MU SHICHUN, ZENG WEIHAO, TIAN JINSAI
• Format: Patent
• Language: Chinese; English
• Published: 14.06.2024
• 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 belongs to the field of lithium ion battery cathode materials, and discloses a double-metal-element modified single-crystal high-nickel-layer cathode material and a preparation method thereof. The bimetallic element modified single crystal high-nickel layered cathode material is a Nb and Al bimetallic element modified single crystal high-nickel layered cathode material, and a transition metal position in the material is doped with Al; a Nb-rich fast ion conductor layer is introduced to the surface of the material, the single-crystal high-nickel layered cathode material is LiNixCoyMn1-x-yO2, x is greater than or equal to 0.6, and y is greater than or equal to 0.1. On the basis of a synergistic reaction introduced by Al and Nb, lattice oxygen in the structure can be stabilized, release of the lattice oxygen is inhibited, and therefore the electrochemical stability of a 3-4.6 V wide voltage interval is remarkably enhanced. 本发明属于锂离子电池阴极材料领域，公开了一种双金属元素改性单晶高镍层装阴极材料及其制备方法。双金属元素改性单晶高镍层状阴极材料，其为Nb、Al双金属元素