Preparation method of nickel-rich NCM811 nanoparticles

Abstract

The invention relates to a preparation method of nickel-rich NCM811 nanoparticles. The preparation method comprises the following steps: calcining a nickel-rich NCM811 precursor nanofiber membrane prepared from an electrostatic spinning precursor solution through electrostatic spinning to prepare the nickel-rich NCM811 nanoparticles; the electrostatic spinning precursor solution is composed of a PVP solution, a lithium source, a nickel source, a cobalt source and a manganese source, the molar ratio of the lithium source to the nickel source to the cobalt source to the manganese source is 1.05-1.10: 0.8: 0.1: 0.1, and 1.8-2.2 L of the PVP solution is compounded with 1 mol of the manganese source; the PVP solution is composed of a PVP polymer, g-C3N4 and an ethanol water solution with the volume concentration of 55%-75%, the concentration of the PVP polymer in the PVP solution is not higher than 20 wt%, and the concentration of the g-C3N4 is not lower than 0.1 wt%. The preparation method disclosed by the invention is simple, and the prepared nickel-rich NCM811 nanoparticles have nanoscale particle size, uniform particle size and excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of textile energy storage batteries, and relates to a preparation method of nickel-rich NCM811 nanoparticles. Background technique [0002] Lithium-ion batteries have high energy density, light weight and no pollution. They are key components of energy storage, but their application conditions are complex, which leads to higher requirements for their energy density, cycle life, and production cost. Compared to traditional LiCoO 2 , LiNiO 2 and LiMnO 2 , LiNi 1-x-y co x mn y o 2 It has the advantages of high specific capacity, low raw material cost, environmental friendliness, good current performance, better thermal stability and safety performance, and has become an important material for improving the performance of lithium-ion batteries. Driven by the increasing specific energy, the ternary material LiNi 1-x-y co x mn y o 2 It is developing towards nickel-rich materials with higher discharge sp...

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Problems solved by technology

When preparing nickel-rich NCM811 materials, we expect that the smaller the particle size of the material, the better, and the more uniform the particle size, the better. At present, the synthesis methods of nickel-rich NCM811 materials mainly include solid-phase method, continuous co-precipitation method, sol-gel method, etc. Among them, the nickel-rich NCM811 material produced by continuous co-precipitation method has the smallest particle size, about 10-50 microns, but its particle size uniformity is not good

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