Titanium and zirconium doped and vanadium coated ternary positive electrode material and preparation method thereof

Abstract

The invention relates to a titanium and zirconium double-doped and vanadium-coated ternary positive electrode material and a preparation method thereof, an integral ternary positive electrode material and a coating layer coating the surface of the ternary positive electrode material. The material of the coating layer comprises vanadium oxide, the ternary positive electrode material comprises a titanium element, a zirconium element and an NCM ternary precursor, and the molar ratio of Ni to Co to Mn in the NCM ternary precursor is 7: 1: 2. The preparation method comprises the steps of 1, uniformly mixing an NCM ternary precursor, lithium hydroxide monohydrate, nanoscale titanium dioxide and nanoscale zirconium oxide, sintering, stirring and mixing with ionized water with vanadium oxide again, drying, and sintering to obtain the titanium and zirconium double-doped and vanadium-coated ternary positive electrode material. The method is simple to operate, the process and the technology are easy to implement, the doping amount is easy to control, large-scale commercial application can be achieved. The method can be used for doping other ternary positive electrode materials or lithium-rich positive electrode materials.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a ternary positive electrode material doped with titanium and zirconium and coated with vanadium and a preparation method thereof. Background technique [0002] At present, among the cathode materials of many lithium-ion batteries, the layered nickel-cobalt-manganese (NCM) ternary cathode material Li[Ni1-x-yCoxMny]o2 (0.1≤x≤0.3, 0.1≤y≤0.3) combines the traditional LiNiO2 , The advantages of LiCoO2 and LiMnO2 materials have a relatively stable structure, good cycle performance, and high capacity, making them a promising cathode material. [0003] With the development of power batteries, the comprehensive performance requirements of NCM ternary cathode materials are also increasing. Therefore, the modification of ternary cathode materials has become the current research hotspot. The modification of ternary cathode materials is general...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a ternary positive electrode material doped with titanium and zirconium and coated with vanadium and its preparation method, which solves the problem that the existing doped positive electrode material cannot effectively improve performance and consumes a lot of energy when preparing the positive electrode material question

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