Anion-cation co-doped nickel-manganese-based material and application in sodium-ion battery positive electrode

Abstract

The invention discloses an anion-cation co-doped nickel-manganese-based material, a preparation method thereof and application of the anion-cation co-doped nickel-manganese-based material as a positive electrode material. The method comprises the following steps: complexing NH4 < + > in an ammonia water solution with nickel ions and manganese ions to form a primary complex as a core, then complexing NH4 < + > with the nickel ions and the manganese ions while the nickel ions, the manganese ions and OH <-> in the solution form a precipitate, continuously complexing and precipitating, growing the core, preparing a spherical anion-doped nickel-manganese-based hydroxide precursor, and preparing the spherical anion-doped nickel-manganese-based hydroxide precursor into the spherical anion-doped nickel-manganese-based hydroxide precursor. And mixing the nickel-manganese-based sodium ion positive electrode material with a sodium source and a metal compound, and calcining to obtain the anion-cation co-doped nickel-manganese-based sodium ion positive electrode material. The PH required by the reaction is adjusted through a cellulose solution dissolved by sodium hydroxide in the precursor synthesis stage, meanwhile, cellulose serves as a template agent to form a channel on a framework of the precursor, a porous structure is formed through subsequent sintering, and sodium ion deintercalation and electrolyte infiltration are facilitated. The preparation process is simple, and the cycle performance of the sodium ion material is improved.

Description

technical field [0001] The invention relates to the technical field of material chemistry, in particular to an anion-cation co-doped nickel-manganese-based material, a preparation method thereof, and an application as a positive electrode material. Background technique [0002] Sodium and lithium are in the same main group, they have similar physical and chemical properties and storage mechanisms, which also makes sodium-ion batteries and lithium-ion batteries have similar structures and working principles, and sodium is abundant in the earth's crust, so sodium-ion batteries are used. Considered to be a promising replacement for lithium-ion batteries, it will have a greater market advantage than lithium-ion batteries. [0003] As a vital functional component of Na-ion batteries, Na-ion cathode materials play a key role in improving the performance of Na-ion batteries. The current mainstream sodium ion cathode materials include layered transition metal oxides, polyanionic co...

AI Technical Summary

Problems solved by technology

Its preparation method is to prepare cation-doped sodium ion positive electrode material by sol-gel method. The sodium ion positive electrode material prepared by this method is simple, but the capacity is low, the cost of preparation is high, and the process stability is poor, which is not conducive to industrialization Production

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