Method for preparing active lithium cobalt oxide

Abstract

Disclosed is a manufacturing method for active lithium cobalt, whose characteristics includes the following steps: make highly pure cobalt salt solution with level of purification, by using primitive cobalt ore as raw material; make cobalt salt solution with high level of purification whose density is 40~70g / L have chemical reaction with precipitator whose density is 60~200g / L, under the temperature of 40~80deg.C, with reaction time of 5~60 minutes, and its PH value is 7.2~9.5 after reaction, cobalt salt solution for battery is created by filtration, washing and dry; calcine cobalt salt solution for 2~7 hours under the temperature of 400~830deg.C, micronsized or millimicronsized cobaltosic oxide is made by shattering; mix the shattered micronsized cell lithium chlorate and micronsized or millimicronsized cobaltosic oxide according to micronsized or millimicronsized cobaltosic oxide of 1.00~1.04:1, and calcine for 10~20 hours under the temperature of 450~950deg.C, then the final product is formed by comminution and classification. The material made by the method has excellent electrochemical property except chemical and physical properties.

Description

Technical field: [0001] The invention relates to a preparation method of a highly active lithium-ion battery positive electrode material, which belongs to the research and application fields of chemical industry, material, electrochemistry and energy. Background technique: [0002] Lithium-ion batteries are a new generation of rechargeable batteries developed in recent years. They are widely used in many fields such as mobile phones and notebook computers. The quality of lithium-ion battery cathode materials largely determines the performance of lithium-ion batteries. At present, lithium-ion batteries with superior performance mainly choose lithium cobalt oxide as the positive electrode material. There are many ways to prepare lithium cobalt oxide. One is to prepare lithium cobalt oxide with metal cobalt flakes. Since the cobalt flakes may be processed from recycled cobalt materials, it is difficult to ensure the high activity of lithium cobalt oxide; the other is Using a s...

AI Technical Summary

Problems solved by technology

There are many ways to prepare lithium cobalt oxide. One is to prepare lithium cobalt oxide with metal cobalt flakes. Since the cobalt flakes may be processed from recycled cobalt materials, it is difficult to ensure the high activity of lithium cobalt oxide; the other is Using a series of processes such as leaching, extraction, and stripping to prepare high-purity cobalt salt solution from ore, and then using conventional chemical precipitation to prepare cobalt salt, it is difficult to ensure that its crystal structure meets the needs; do not pay attention to using a suitable atmosphere and protection gas to control the crystallization of tricobalt tetroxide and lithium cobalt oxide, so it is impossible to obtain products with excellent chemical, physical and electrochemical properties