Spinel nickel manganese-based oxide cathode material and preparation process thereof

Abstract

The invention provides a spinel nickel manganese-based oxide cathode material. The composition of the material by atomic ratio is represented as formula (I): LiaMx+yNi0.5-yMn1.5-xO4, (I), wherein, 0.9<=a<=1.1, 0<=x<=0.2, 0<=y<=0.1, M represents one of or a plurality of Mg, Al, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zr, Nb, Ag, Sn, Ce, Nd, Ta, W, Pt and Au. The invention also provides a preparation process of the spinel nickel manganese oxide cathode material. During the preparation process of the spinel nickel manganese oxide cathode material, a compound containing M is added as a doping element, so that the surface energy of the material is reduced during solid-phase synthesis, nickel elements and manganese elements are distributed evenly, impure phases can be avoided, and the high-temperature cycle performance of the obtained cathode material can be improved.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a spinel nickel-manganese-based oxide positive electrode material and a preparation method thereof. Background technique [0002] As a reusable secondary battery, lithium-ion batteries have the advantages of good safety, high discharge specific energy, and long charge and discharge life. They have been widely used in digital products, electric tools, and electric bicycles. With the country's emphasis on green energy and people's deepening awareness of the energy crisis, lithium-ion power batteries, as a key component of electric vehicles and hybrid vehicles, have become the focus of attention. [0003] The performance of a lithium ion battery depends critically on the performance of its positive electrode material. The prior art discloses a variety of materials that can be used as the positive electrode of a lithium ion b...

AI Technical Summary

Problems solved by technology

The Chinese patent document with the publication number CN102005563A discloses a method for the preparation and surface coating of a high-voltage positive electrode material for a lithium-ion battery. It uses a gel-sol method to obtain lithium nickel manganese oxide, that is, firstly, the manganese source compound and the nickel source compound are mixed in a solvent. mixed with a surfactant, then dried into a sol after being mixed with a surfactant, then dried into a gel and then calcined to obtain nickel-manganese oxide; then the nickel-manganese oxide was mixed with a lithium source compound for ball milling, dried and heat-treated to obtain nickel Lithium manganate, this method uses organic acid as surfactant, which not only affects the environment, but also increases production costs

The Chinese patent literature with the publication number CN101640266A discloses a method for preparing a lamellar high-voltage lithium-ion battery high-voltage positive electrode material by using a hydrothermal method. First, potassium permanganate and potassium hydroxide are mixed to form a hydrothermal solution, and then two manganese source, stirring, heating and heat preservation, filtering, and washing to obtain a precursor; mixing the precursor with a transition metal source compound solution, stirring, filtering, washing, and drying to obtain a transition metal exchange type product; the metal exchange The type product is mixed and stirred with lithium hydroxide solution, and the high-voltage positive electrode material of lithium-ion battery is obtained after the reaction. This method not only has complicated production procedures, but also has harsh reaction conditions, and is not suitable for industrial production.

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