Method for separating and recycling waste lithium battery pole piece material

A waste lithium battery, separation and recycling technology, applied in battery recycling, lithium storage battery, waste collector recycling and other directions, can solve the problems of aluminum foil crushing, difficult recycling, and high energy consumption.

Active Publication Date: 2022-01-07
SONGSHAN LAKE MATERIALS LAB +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007]CN108365286A proposes a method for stripping the anode current collector of a nickel-cobalt-manganese ternary lithium battery based on a supercritical liquid, including putting the anode material of a nickel-cobalt-manganese ternary lithium battery into In the reaction kettle, add a solvent to completely submerge the positive electrode material of the nickel-cobalt-manganese ternary lithium battery, with the aid of mechanical stirring, and use supercritical fluid to dissolve and strip the organic components in the positive electrode material under a certain humidity and pressure, which is difficult to recycle.
[0008] CN108736086A discloses a supercritical fluid extraction method to reclaim polyvinylidene fluoride, aluminum and positive electrode waste (active material and conductive carbon powder mixture) in the positive plate of lithium ion waste batteries ) method, this method does not use acid-base treatment electrodes, does not need high-temperature incineration, does not produce chemical waste

Method used

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  • Method for separating and recycling waste lithium battery pole piece material
  • Method for separating and recycling waste lithium battery pole piece material
  • Method for separating and recycling waste lithium battery pole piece material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] (1) Raw material preparation: Soak waste batteries in 5% sodium chloride solution and discharge to 0V.

[0063] (2) Under a negative pressure environment, disassemble the waste lithium battery provided by (1) after discharge, remove the battery casing, take out the battery cell, and remove the diaphragm wrapping the positive and negative electrodes, respectively, as follows: figure 2 The shown positive electrode current collector is a positive electrode sheet of aluminum and the negative electrode current collector is a negative electrode sheet of copper, wherein figure 2 (A) is the positive electrode sheet, (B) is the negative electrode sheet.

[0064] (3) Electrolyzer preparation: Put the positive electrode sheet and the negative electrode sheet into the positive electrode coating layer collection tank and the negative electrode coating layer collection tank respectively, then add an alkaline aqueous solution with a mixed alkali content of 1moL / L into the electrolyt...

Embodiment 2

[0073] (1) Raw material preparation: Soak waste batteries in 10% by mass sodium chloride solution and discharge to 0V.

[0074] (2) Under a negative pressure environment, disassemble the used lithium battery provided in (1) after discharge, remove the battery case, take out the battery cell, remove the diaphragm wrapping the positive and negative electrodes, and obtain the positive electrode with the tab broken respectively The positive electrode sheet whose current collector is aluminum and the negative electrode sheet whose tabs are broken are copper negative electrode sheets.

[0075] (3) electrolyzer preparation: the electrolyzer is provided with the first nickel sheet that is positioned at the positive electrode coating layer collection tank, and is positioned at the second nickel sheet of the negative electrode coating layer collection tank, the positive electrode sheet and the negative electrode sheet that (2) obtains are respectively Put into the positive electrode coa...

Embodiment 3

[0082] It differs from Embodiment 1 only in steps 3)-(5).

[0083] (3) Electrolyzer preparation: put the positive electrode sheet and the negative electrode sheet into the positive electrode coating layer collection tank and the negative electrode coating layer collection tank respectively, then add 1moL / L sodium hydroxide aqueous solution into the electrolytic cell and fill up the electrolytic cell, At this time, the aqueous sodium hydroxide solution has not passed through the separator.

[0084] (4) Large current pulse: Obtain a power supply with the same function as the battery charge and discharge test cabinet. The positive line of the power supply output by the power supply clamps the tab of the positive plate in (3), and the negative line of the power supply output by the power supply clamps ( 3) In the tab of the negative electrode sheet, the anode and the cathode are energized to perform high-current pulse charge-discharge cycle treatment for 5 minutes, then stop, and ...

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Abstract

The invention discloses a method for separating and recycling a waste lithium battery pole piece material, and belongs to the field of lithium battery recycling. The method for separating and recycling the waste lithium battery pole piece material comprises the following steps that: S1, a pole piece of a waste lithium battery is obtained, wherein the pole piece comprises a current collector and a coating layer formed on the surface of the current collector; and S2, an anode and a cathode are provided, a positive plate in the pole piece is taken as the anode, and/or a negative plate in the pole piece is taken as the cathode, in an alkaline electrolyte aqueous solution, the anode and the cathode are electrified to perform high-current pulse charge-discharge cycle treatment to electrolyze water, and then the anode and the cathode are soaked in an acidic aqueous solution, at least part of the coating layer on the pole piece is separated from the current collector, the current in the high-current pulse charge-discharge cycle treatment is 2-10 C, and the charge-discharge interval is 5-60 s. On the premise of simplifying the recovery process, the fluid and the coating can be effectively separated and recovered, the recovery and separation efficiency is high, and the purity of a final product is high.

Description

technical field [0001] This application relates to the field of lithium battery recycling, in particular, to a method for separating and recycling waste lithium battery pole piece materials. Background technique [0002] The high energy density, high rate performance, long cycle life, high working voltage and other advantages of lithium power batteries have become a new type of energy storage battery that is currently receiving much attention. At the same time, through the unremitting efforts of scientific researchers in the industry, the battery life has been doubled. Therefore, lithium batteries have become the preferred energy storage application batteries for electric vehicles. As various automobile giants accelerate the pace of electrification, the installed capacity of power batteries in the future will soared. The magnification of global demand for lithium battery materials has caused the price of key battery materials to skyrocket, pushing up the manufacturing costs...

Claims

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Application Information

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IPC IPC(8): H01M10/54H01M4/13H01M10/052
CPCH01M10/54H01M4/13H01M10/052Y02E60/10Y02W30/84
Inventor 覃小蓝黄学杰马晓威
Owner SONGSHAN LAKE MATERIALS LAB
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