A method for reducing sulfur content of ternary precursor

A technology of sulfur content and precursors, which is applied in the field of preparation of ternary precursors, can solve the problems of low capacity and poor cycle performance of positive electrode materials, and achieve the effects of reducing impurity content, improving tap density and saving water resources.
CN110817975BActive Publication Date: 2020-08-07宜宾光原锂电材料有限公司
5 Cites 2 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
宜宾光原锂电材料有限公司
Publication Date
2020-08-07
Patent Text Reader

Abstract

The invention discloses a method for reducing the sulphur content of a ternary precursor. Sulfate is used as a ternary salt raw material, and the ternary salt raw material, an alkaline solution and acomplexing agent are added to a reaction kettle for co-precipitation to prepare the ternary precursor, after co- precipitation reaction is carried out for 5-15 hours, pure water is added continuouslyor intermittently to the reaction kettle to replace clear liquid in the reaction kettle, and meanwhile, the alkaline solution and the complexing agent are added to keep a reaction system stable. The problem that the sulphur content in the ternary precursor exceeds the standard due to the fact that the sulfate is adsorbed on the surface of a crystal during the growth of the crystal and then wrappedinside the crystal is solved, the sulphur content of the prepared ternary precursor after one-time washing is less than 530 ppm, and during the subsequent water washing process, water resources are effectively saved; and the impurity content is reduced, the jolt ramming density of the ternary precursor is increased, and the morphology of the ternary precursor is not affected.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The present invention relates to the technical field of the preparation method of the ternary precursor, especially a method for reducing the sulfur content of the ternary precursor. Background technique

[0002] At present, lithium-ion batteries occupy a large market share in the field of portable electronic devices by virtue of their advantages such as high specific capacity, long cycle life, low self-discharge rate, no memory effect, and environmental friendliness, and are recognized as the most promising electric battery. Vehicle power battery. The ternary nickel-cobalt-manganese cathode material is an important cathode material for lithium-ion batteries. It has important advantages such as better performance than lithium cobalt oxide, much lower cost than lithium cobalt oxide, and much higher energy density than lithium iron phosphate. Mainstream cathode material for automotive power batteries.

[0003] In the preparation process of positive ele...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More