High-nickel cobalt-free positive electrode material as well as preparation method and application thereof

• Main Author: NI JIHONG
• Format: Patent
• Language: Chinese; English
• Published: 04.06.2024
• 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 provides a high-nickel cobalt-free positive electrode material and a preparation method and application thereof. The chemical formula of the positive electrode material is LiNixMnyMgzOaFb, in the formula, x + y + z = 1, and a + b = 2, xgt, 0.8, zgt; 0, bgt; 0; in particles of the high-nickel cobalt-free positive electrode material, the content of the Ni element is in a decreasing trend from the center of the particles to the surface layer of the particles, and the content of the Mn element is in an increasing trend from the center of the particles to the surface layer of the particles. The Mg and F elements are introduced into the cobalt-free positive electrode material, and the gradient distribution of the Ni and Mn elements is matched, so that the high capacity of the high-nickel material is ensured, and meanwhile, the cycle life of the battery prepared by using the positive electrode material is also remarkably prolonged. 本发明提供一种高镍无钴正极材料及其制备方法和应用。本发明的正极材料的化学式为LiNixMnyMgzOaFb，式中，x+y+z＝1，a+b＝2，