Preparation method of magnesium-doped lithium nickel cobalt oxide anode material for lithium ion battery

Abstract

The invention belongs to the technical field of battery material preparation, and in particular relates to a preparation method of a magnesium-doped lithium nickel cobalt oxide anode material for a lithium ion battery. The preparation method comprises the following steps: proportionally preparing a Li source, a Ni source, a Co source and a Mg source, and mixing the materials by wet ball-milling to obtain blended slurry; spray-drying the blended slurry; preheating the dried material in a heat treatment atmosphere to obtain a pre-sintering material; pulverizing the pre-sintered material, adding a PVA (polyvinyl alcohol) binder, and compacting to obtain a dense block; heating the compacted block and performing heat preservation in the heat treatment atmosphere to obtain a sintered material; and finally cooling, pulverizing, and screening the sintered material to obtain the magnesium-doped lithium nickel cobalt oxide anode material. The magnesium-doped lithium nickel cobalt oxide anode material prepared by the method has the characteristics of uniform particle distribution, high capacity and high tap density. The preparation method has the advantages of simple process and low cost, thus being applicable to industrial production.

Description

technical field [0001] The invention belongs to the technical field of battery material preparation, and in particular relates to a method for preparing a high-density magnesium-nickel-nickel-cobaltate positive electrode material for a lithium-ion battery. Background technique [0002] LiCoO 2 It is the main cathode material for commercial lithium-ion batteries at present, but it has disadvantages such as expensive, not conducive to environmental protection, and low specific capacity. LiNiO 2 The positive electrode material doped with Co element also has LiNiO 2 The high discharge specific capacity of the material stabilizes the layered structure of the material and enhances the cycle stability of the material, but this material also has defects such as poor overcharge resistance, poor thermal stability, and high irreversible capacity for the first discharge. . In order to solve the above problems, so that nickel-cobalt materials can be applied to the commercial field as...

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Problems solved by technology

Chinese patent document CN03112435.6 announced "the method for preparing lithium cobaltate lithium ion battery anode material with nano-cobalt tetroxide as raw material". This method is a traditional high-temperature solid-phase synthesis method. The material has a wide particle size distribution range, large crystal size, and poor electrochemical performance.

The Chinese patent document CN200810052730 announced "the preparation method of doped and surface-coated lithium nickel cobalt oxide", which replaces part of the cobalt which is expensive and has few resources with nickel which is cheap and has many resources, which has certain advantages. The production process adopts liquid The phase synthesis method is the liquid phase synthesis method that produces the precursor first, but this method has problems and shortcomings such as long production process, high cost, complicated process, high equipment requirements, high difficulty in industrialization, and sewage discharge.

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