Regeneration method of nickel cobalt lithium manganate positive electrode material of waste lithium ion battery

Abstract

The invention provides a regeneration method of a nickel cobalt lithium manganate positive electrode material of a waste lithium ion battery. The regeneration method comprises the following steps of ball-milling and refining nickel cobalt lithium manganate positive electrode powder of the waste lithium ion battery, and roasting in a certain environment; then putting into acetic acid, reacting andfiltering to obtain filter residue A and filtrate B; adding iron powder into the filtrate B, filtering, adding ammonia water into the solution, adjusting the pH value, and carrying out centrifugal separation to obtain a filtrate C; putting the filter residue A into a mixed solution of ammonia water and hydrogen peroxide, heating, and accelerating to stir to obtain a turbid solution D; mixing the filtrate C with the turbid solution D, adding nickel, cobalt, manganese and a lithium source to adjust the proportion of valuable metals, and stirring to obtain a turbid solution E; and carrying out spray drying on the turbid solution E, and carrying out high-temperature solid phase treatment to obtain the regenerated nickel cobalt lithium manganate positive electrode material. The positive electrode material regeneration process provided by the invention is clean, low in cost, good in impurity removal effect and free of wastewater and waste gas emission, the raw material acid and alkali can berecycled, and the valuable metals can be utilized with high value.

Description

technical field [0001] The invention belongs to the technical field of recovery of discarded lithium-ion battery cathode materials, and in particular relates to a recycling method for the discarded lithium-ion battery nickel-cobalt-lithium-manganese-oxide cathode material. Background technique [0002] Since 2014, my country's new energy vehicles have developed rapidly, and production and sales have shown a high-speed growth trend. According to data from the China Association of Automobile Manufacturers, the sales volume of new energy vehicles in 2018 has reached 1.256 million, which is 16.8 times the sales volume in 2014. It is estimated that the sales volume may reach 2.3 million by 2020. The general scrapping period of lithium iron phosphate batteries is 5 years, and the scrapping period of ternary lithium batteries is 6 years. It is expected that power batteries will enter a large-scale scrapping period at the end of 2019. By 2020, the installed capacity of scrapped powe...

AI Technical Summary

Problems solved by technology

If the waste lithium ions cannot be effectively disposed of, it will cause serious harm to the environment and threaten the safety of human life, and if the valuable metal elements cannot be recycled, a large amount of resources will be wasted, so waste lithium-ion batteries In need of recycling

[0003] In recent years, the research on the recycling of discarded lithium-ion batteries is increasing day by day, and there are two major problems in the recycling: one is the removal of impurities in the recycling process, and the other is the recovery rate of effective elements.

These processes also consume a large amount of acid and high energy consumption. At the same time, valuable metals and impurity elements will be leached simultaneously. It is difficult to ensure the phase and electrochemical performance of the recovered positive electrode material, and the recovery rate is low.

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