Leaching method of positive electrode active material of waste lithium ion battery

A cathode active material, a technology for lithium ion batteries, applied in the field of lithium ion batteries, can solve the problems of high energy consumption, influence rate, and high set temperature, and achieve the effects of reducing corrosion, improving leaching rate, and shortening leaching time.

Active Publication Date: 2017-06-13
CENT SOUTH UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, the setting temperature of the roasting reaction is higher, which brings higher energy consumption; and the sodium bisulfate remains stable, and the roasting reaction is a solid-solid reaction in the resistance furnace, which affects its rate

Method used

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  • Leaching method of positive electrode active material of waste lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Take some lithium cobalt oxide batteries for used mobile phones, put them into the powder containing waste carbon slag and discharge them, pick them up when the voltage is lower than 1V, cut off the shell, drain the remaining electrolyte, and take out the winding core. Preliminarily crush the winding core, put it into a roasting furnace and heat it to 400°C, burn off the binder on the pole piece and most of the negative electrode carbon material in the air atmosphere, and absorb the tail gas with a lime solution. The sintered solid mixture is taken out and sieved, the copper foil and aluminum foil fragments are on the sieve, and the cathode active material containing lithium cobalt oxide is mainly on the under sieve.

Embodiment 2

[0040] Get 20g embodiment 1 gained under-sieve product, pack into fluidized roasting furnace, pass into sulfur dioxide gas with the speed of 30L / h, tail gas uses NaHCO 3 Alkaline absorption. After the atmosphere was stabilized, the temperature was raised to 300°C at a rate of 10°C / min, and the solid particles were suspended in the furnace, and kept for 1.5h. After cooling to room temperature, take it out, add an appropriate amount of deionized water, and continue stirring for 20 minutes. The stirred cloudy solution was filtered to obtain a clear filtrate. After the sample was evaporated to dryness, X-ray diffractometer and atomic emission spectrometer detected that the main components of the filtrate were cobalt sulfate and lithium sulfate, and the content of cobalt element accounted for about 87% of the standard Co content of the original waste battery; the main component of the filter residue was carbon 1. Lithium cobaltate, wherein the content of cobalt element accounts f...

Embodiment 3

[0042] Get 20g embodiment 1 gained under-sieve product, pack into fluidized roasting furnace, pass into sulfur dioxide gas with the speed of 30L / h, tail gas uses NaHCO 3 Alkaline absorption. After the atmosphere was stabilized, the temperature was raised to 350°C at a rate of 10°C / min, and the solid particles were suspended in the furnace, and kept for 1.5 hours. After cooling to room temperature, take it out, add an appropriate amount of deionized water, and continue stirring for 35 minutes. The stirred cloudy solution was filtered to obtain a clear filtrate. After the sample was evaporated to dryness, X-ray diffractometer and atomic emission spectrometer detected that the main components of the filtrate were cobalt sulfate and lithium sulfate, and the content of cobalt element accounted for 98.3% of the standard Co content of the original waste battery; the main component of the filter residue was carbon.

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Abstract

The invention discloses a leaching method of a positive electrode active material of a waste lithium ion battery, which comprises the steps of performing short-circuit discharging, disassembling, binder stripping, crushing and screening on the waste lithium ion battery to obtain electrode material powder; roasting the electrode material powder under a sulfur dioxide carrier gas atmosphere to obtain a roasted product, wherein the sulfur dioxide carrier gas flow is 30 to 50L / h, and the roasting temperature is 300 to 450 DEG C; dispersing the roasted product into water, stirring and filtering to obtain an aqueous solution of the positive electrode active material. The leaching method has the characteristics that the reaction rate and efficiency are greatly improved, the environmental friendliness and pollution-free are realized, the process is simple, and the commerce practical application cost is greatly reduced at the same time; the leaching method is capable of realizing large-scale production.

Description

technical field [0001] The invention relates to a method for leaching positive electrode active materials in the recycling process of waste lithium ion batteries, belonging to the field of lithium ion batteries. Background technique [0002] Since its inception, lithium-ion batteries have been widely used in electronic products, power tools, energy storage devices, electric vehicles and other fields due to their high voltage, high specific capacity, good cycle performance, no memory effect, and small size. It is recognized as the most promising secondary battery. Especially with the rise and rapid growth of the domestic electric vehicle market in recent years, the monomer scale and overall consumption of lithium-ion batteries have been significantly improved. At the same time, more and more batteries that have degraded performance and reached the end of their service life are facing disposal difficulties. [0003] There are also some leaching methods for active materials i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/10C22B23/00C22B47/00C22B26/12H01M10/54
CPCC22B1/10C22B7/006C22B23/0407C22B26/12C22B47/00H01M10/54Y02P10/20Y02W30/84
Inventor 张治安杨声海杨心慧赖延清方静洪波张凯李劼
Owner CENT SOUTH UNIV
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