Preparation method of nickel doped lithiated molybdenum trioxide cathode material

Abstract

The invention relates to the technical field of preparation of lithium ion battery electrode materials, in particular to a preparation method of a nickel doped lithiated molybdenum trioxide cathode material for lithium ion batteries. In the process of preparing lithiated molybdenum trioxide, a nickel source and a lithium source are added, i.e. lithiation and nickel doping of molybdenum trioxide are realized at the same time of synthesis of the molybdenum trioxide material, nickel doping can enlarge the crystal lattice volume, improve the surface morphology, and enhance the phase purity; the lithium source is introduced in the synthesis process to enhance the electrical conductivity of the molybdenum trioxide material system so as to facilitate the enhancement of the material's charge-discharge rate performance, and can also improve the structural stability of molybdenum trioxide material, all the operations are remarkably helpful to improve the electronic conductivity and lithium ion mobility, and also can stabilize the crystal lattice of a molybdenum trioxide crystal. The preparation technology for nickel doped lithiated molybdenum trioxide provided by the invention provides a newapproach for preparation of high-performance commercial lithium ion battery electrode materials.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion battery electrode materials, in particular to a preparation method of a nickel-doped lithiated molybdenum trioxide positive electrode material for lithium-ion batteries. Background technique [0002] Molybdenum is widely used in the preparation and modification of positive and negative materials for lithium batteries. First, molybdenum trioxide itself can be used as a cathode material. For example, molybdenum powder is slowly dissolved in 30% hydrogen peroxide until a transparent orange peroxomolybdic acid sol is observed, and then polyvinylpyrrolidone is added to it to form a mixed sol. After two days of hydrothermal reaction in an autoclave at 180°C, cooling, filtering, precipitation, and then washing with deionized water three times, the sample was then dried at 80°C for 12 hours to obtain α-MoO 3 Nanowires. The scanning electron microscope observation results show that th...

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Problems solved by technology

However, molybdenum trioxide material also has many problems

For example, the volume of molybdenum trioxide changes greatly during charging and discharging, which is not conducive to the stability and integrity of the material structure during the intercalation and deintercalation of lithium ions. This will promote the accelerated dissolution of molybdenum in the electrolyte, which is not conducive to material circulation. performance improvement

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