Preparation method of layered quaternary positive electrode material of lithium ion battery

Abstract

The invention belongs to the technical field of battery positive electrode materials, and particularly relates to a preparation method of a layered quaternary positive electrode material of a lithium ion battery, which comprises the following steps: preparing soluble salts of metal elements (Ni, Co, Mn and Fe) into a mixed metal solution, adding the mixed metal solution into a solution of an oxalic acid precipitant, and uniformly stirring to obtain the layered quaternary positive electrode material of the lithium ion battery. The preparation method comprises the following steps: preparing a precursor of a novel quaternary positive electrode material by a coprecipitation method after adjusting a proper pH value, and finally calcining the precursor at high temperature to obtain a target product LiNi < 0.6 > Co < 0.08 > Mn < 0.24 > Fe < 0.08 > O < 2 >. Compared with an existing quaternary material LiNi < 0.6 > Co < 0.1 > Mn < 0.2 > Fe < 0.1 > O < 2 > preparation process, the quaternary positive electrode material LiNi < 0.6 > Co < 0.08 > Mn < 0.24 > Fe < 0.08 > O < 2 > prepared by the method disclosed by the invention is stable in structure, high in energy density and low in first irreversible capacity percentage, and has relatively good rate capability and cycle performance.

Description

technical field [0001] The invention belongs to the technical field of battery cathode materials, and in particular relates to a preparation method of a layered quaternary cathode material for a lithium ion battery. Background technique [0002] With the rapid development of science and technology and continuous economic growth, energy has become the core part of the progress of all walks of life. Batteries (including lead-acid batteries, lithium-ion batteries, nickel-cadmium batteries, etc.) play an important role in various places in people's lives, from smart electronic products such as mobile phones, cameras and notebook computers that can be seen everywhere to new energy vehicles to Large-scale energy storage equipment used by enterprises and countries needs to be applied to batteries. Among them, lithium-ion batteries have been widely developed and applied due to their advantages such as high energy density, good cycle performance, and low memory effect. The performa...

AI Technical Summary

Problems solved by technology

However, the quaternary material prepared by this method has a general discharge capacity and a large percentage of the first irreversible capacity.

At the same time, the calcination time in the preparation process is too long, and the calcination temperature is not suitable, which leads to poor crystal morphology of the material and a decrease in electrochemical capacity; poor selection of lithium source affects the shape and capacity of the material

Moreover, there are some redundant and simplistic stages in the process, such as drying in a vacuum oven at 90°C for 12 hours after sintering; this process also requires the use of complex equipment such as vacuum freeze dryers

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