Method for increasing specific surface area of precursor of positive electrode material of lithium ion battery

Abstract

The invention discloses a method for increasing the specific surface area of a precursor of a positive electrode material of a lithium ion battery. The precursor contains nickel and manganese. The method comprises the following steps: step 1, removing mother liquor by a centrifugal machine after coprecipitation reaction; step 2, introducing a 0.1-3.0 mol / L NaOH solution for leaching while keeping the rotation of the centrifugal machine; step 3, keeping the centrifugal machine rotating, and introducing deionized water at 20-90 DEG C for leaching; sequentially circulating the step 2 and the step 3 for 1-3 times to obtain a solid; step 4, adding deionized water into a reaction kettle, adding the solid obtained in the step 3 at 45-95 DEG C, adding a NaOH solution while stirring to enable the concentration of NaOH to be 0.1-1.0 mol / L, introducing 1-10m<3> / h of air or oxygen, and stirring for 5-15 hours; and step 5, washing and drying. According to the method disclosed by the invention, the tap density is not changed while the specific surface area of the precursor of the positive electrode material of the lithium ion battery is increased, the morphology is basically not changed under a scanning electron microscope, and the method is suitable for high-capacity and high-current lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of precursors of positive electrode materials of lithium ion batteries, and in particular relates to a method for increasing the specific surface area of ​​precursors of positive electrode materials of lithium ion batteries. Background technique [0002] In recent years, with the improvement of people's awareness of environmental protection, the market prospects of new clean energy vehicles and hybrid vehicles are more promising. As the power source of clean energy vehicles, batteries are being developed and researched more and more. At present, nickel-cobalt-manganese and nickel-manganese cathode materials are the mainstream research directions of cathode materials for lithium-ion batteries. The performance of the lithium-ion battery cathode material precursor determines most of the performance of the lithium-ion battery cathode material. With the improvement of the performance index requirements for lithiu...

AI Technical Summary

Problems solved by technology

However, if it is only necessary to improve a single index of the lithium-ion battery cathode material precursor, it is often difficult to achieve it through coprecipitation reactions.

[0003] Specific surface area is an important indicator of lithium-ion battery cathode materials. Larger specific surface area can promote the deintercalation of lithium ions, improve the specific capacity of the material and the high-current charge-discharge capability, so in some high-rate, high-capacity power batteries Lithium-ion battery positive electrode materials with larger specific surface area are required, and therefore positive electrode material precursors with larger specific surface area are required. However, in the process of preparing precursors by co-precipitation reaction in the prior art, increasing the specific surface area often leads to the precursor The tap density of the bulk material is reduced, which cannot meet the requirements of large specific surface area and high tap density at the same time

Images