A method for preparing a high-voltage cathode material by using a waste lithium cobalt oxide battery

Abstract

The invention discloses a method for preparing a high-voltage cathode material by using a waste lithium cobalt oxide battery. The stripped cathode material of the waste lithium cobalt oxide battery iscleaned, calcined and the content of cobalt and lithium in the cathode material is detected. According to the stoichiometric ratio of lithium-rich manganese solid solution, nickel salt, cobalt salt and manganese salt are prepared into mixed salt solution of nickel salt, cobalt salt and manganese salt, and then a complexing agent solution I, complexing agent solution II and precipitating agent solution are prepared respectively; adding a complexing agent solution II as a base liquid into the reaction kettle and adding the calcined waste lithium cobaltate material, the Ni-Co-Mn mixed salt solution, the complexing agent solution I and the precipitating agent solution are respectively added to carry out a precipitation reaction, the pH value, the concentration of the complexing agent, reaction temperature and reaction time are controlled, filtering, cleaning and drying are performed to obtain a composite precursor, and the composite precursor is mixed with a lithium source and calcined tocool to room temperature to obtain the cathode electrode material; and the material prepared by the invention has high crystallinity, high structural stability and good high voltage charge-dischargecycle stability.

Description

technical field [0001] The invention relates to the field of recovery and reuse of waste lithium ion batteries, in particular to a method for preparing high-voltage positive electrode materials using waste lithium cobalt oxide batteries. Background technique [0002] Lithium-ion batteries are recognized by the international community as the most ideal chemical power source for their high energy density, long life, small self-discharge, no memory effect, and environmental protection. They are widely used in mobile phones, notebook computers, power tools, and portable cameras. and other electronic products. At the same time, lithium-ion batteries play an important role in the field of intermittent clean energy storage such as wind energy, solar energy and tidal energy. In addition, the ever-expanding fields of electric vehicles, electric bicycles, aerospace, military mobile communication tools and equipment will bring more room for the development of lithium-ion batteries. H...

AI Technical Summary

Problems solved by technology

However, the above methods have the following shortcomings: 1) The treatment of the positive electrode material after stripping still involves wet leaching and precipitation processes, the process flow is relatively long and the technology is difficult; 2) The recovered materials cannot be directly used as active materials. Product value-added is not obvious

Invention patent CA105428747A discloses a method of using lithium hydroxide solution to repair and recycle lithium cobalt oxide in waste batteries. However, the performance of the repair material obtained by this method is only at the level of ordinary lithium cobalt oxide materials, and the value-added is not obvious

Summarizing the current patent literature on recycling technology, there is no literature report on the direct preparation of high-voltage lithium cobalt oxide materials from waste lithium cobalt oxide batteries as anode materials for lithium-ion batteries

Images