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Ball-milling and acid-leaching method for 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 problems such as short process, achieve the effects of efficient leaching, shortening leaching time, and improving leaching efficiency

Active Publication Date: 2017-07-04
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Although the mixed treatment method is simple and easy, the process is short, but the treatment of sulfur dioxide tail gas or the use of hydrogen will bring new environmental and safety problems

Method used

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  • Ball-milling and acid-leaching method for positive electrode active material of waste lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 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

[0048] Weigh 50g of starch, add 1L of deionized water, stir continuously and heat to 70°C until the system becomes a stable paste, named as S1 solution.

Embodiment 3

[0050] Weigh 60g of starch, add 1L of deionized water, stir continuously and heat to 70°C until the system becomes a stable paste, named as S2 solution.

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Abstract

The invention discloses a ball-milling and acid-leaching method for a positive electrode active material of a waste lithium ion battery. The waste lithium ion battery is subjected to short-circuit discharging, dismantling, binder stripping, smashing and sieving to obtain electrode material powder; and the electrode material powder is poured into prefabricated starch paste to be subjected to ball milling with a sulfuric acid solution, and then the mixture is washed and filtered to obtain a positive electrode active material water solution. By virtue of the method, commercial practical application cost is greatly lowered, and the method is green and pollution free and simple in process; and meanwhile, the reaction rate and leaching efficiency of the leaching process are greatly improved, and large-scale production can be realized.

Description

technical field [0001] The invention relates to a reductive acid leaching method for 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 act...

Claims

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Application Information

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IPC IPC(8): H01M10/54C22B7/00C22B3/00C22B26/12
CPCC22B7/007C22B23/043C22B26/12H01M10/54Y02P10/20Y02W30/84
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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