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Method for separating and recycling aluminum foil and positive active substances in retired lithium ion power battery

A cathode active material and power battery technology, which is applied in the field of resource recovery of retired lithium-ion power batteries, can solve the problems of non-inert atmosphere and mixed-type lithium-ion power battery research, high vacuum degree requirements, etc.

Inactive Publication Date: 2021-04-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has high requirements on the vacuum level of the equipment, and it is only for a single lithium cobalt oxide battery, and has not conducted in-depth research on inert atmosphere and mixed type lithium-ion power batteries.

Method used

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  • Method for separating and recycling aluminum foil and positive active substances in retired lithium ion power battery
  • Method for separating and recycling aluminum foil and positive active substances in retired lithium ion power battery
  • Method for separating and recycling aluminum foil and positive active substances in retired lithium ion power battery

Examples

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Effect test

Embodiment 1

[0039] Example 1: A method for separating and recycling aluminum foil and positive electrode active material in a hybrid decommissioned lithium-ion power battery

[0040]Place the decommissioned lithium-ion power batteries of nickel-cobalt lithium manganese oxide, lithium iron phosphate, and lithium manganese oxide in a sodium chloride solution with a concentration of 50g / L for full discharge for 48 hours, then take out the battery and wash it with deionized water. Naturally air dry for more than 24 hours. After using the digital display voltmeter to confirm that the voltage is zero, fix the battery on the console and disassemble it manually step by step, collect the positive electrode pieces for backup, and store the rest in bags. Weigh 0.5g each of nickel-cobalt lithium manganese oxide, lithium iron phosphate and lithium manganese oxide positive electrode into a quartz boat, put the quartz boat into the quartz glass tube of the tube furnace, tighten and close both sides with...

Embodiment 2

[0043] On the basis of Example 1, the mass ratio of nickel-cobalt lithium manganate, lithium iron phosphate and lithium manganate was adjusted, and 1.0 g of nickel-cobalt lithium manganate was weighed, and 0.5 g of lithium iron phosphate and lithium manganate were placed in In the quartz boat, pyrolysis was carried out under the optimal pyrolysis conditions (pyrolysis temperature 450°C, holding time 60min, heating rate 10°C / min), and the rest of the steps remained unchanged. According to calculations, the recovery efficiencies of nickel-cobalt lithium manganate, lithium iron phosphate and lithium manganate cathode active materials are 90.75%, 94.29% and 90.08% respectively, and the purity of aluminum foils are 98.76%, 99.53% and 98.68% respectively.

Embodiment 3

[0045] On the basis of Example 1, the mass ratio of nickel-cobalt lithium manganate, lithium iron phosphate and lithium manganate was adjusted, and 1.0 g of lithium iron phosphate was weighed, and 0.5 g each of nickel-cobalt lithium manganate and lithium manganate were placed in In the quartz boat, pyrolysis was carried out under the optimal pyrolysis conditions, and the rest of the steps remained unchanged. According to calculations, the recovery efficiencies of nickel-cobalt lithium manganate, lithium iron phosphate and lithium manganate cathode active materials are 88.90%, 92.73% and 91.14% respectively, and the purity of aluminum foils are 98.30%, 98.04% and 99.45% respectively.

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Abstract

The invention belongs to the technical field of retired lithium ion power battery resource recovery and discloses a method for separating and recovering an aluminum foil and a positive electrode active substance in a retired lithium ion power battery. The method comprises the following steps (1) carrying out discharge treatment on the retired lithium ion power battery, and disassembling to obtain a positive electrode material; (2) carrying out pyrolysis treatment on the positive electrode material obtained in the step (1) under an inert gas condition; and (3) carrying out physical oscillation on the pyrolyzed positive electrode material obtained in the step (2) to obtain an aluminum foil and a positive electrode active substance. For the mixed type retired lithium ion power battery, recovery efficiency of the positive electrode active substance reaches 94.33%, the purity of the aluminum foil reaches 99.92%, and the recovered positive electrode active substance has a complete crystal structure and good electrochemical activity, and can be directly used for secondary utilization without leaching extraction. The method is simple in process, low in investment cost, environmentally friendly, efficient, capable of avoiding metal loss and wastewater generation and suitable for large-scale recovery.

Description

technical field [0001] The invention belongs to the technical field of resource recovery of decommissioned lithium-ion power batteries, and in particular relates to a method for separating and recycling aluminum foil and positive electrode active materials in hybrid decommissioned lithium-ion power batteries. Background technique [0002] In recent years, lithium-ion power batteries have developed rapidly and have been widely used in new energy vehicles, electric buses, bicycles and other vehicles. Valuable metals such as lithium, cobalt, and nickel contained in positive electrode materials in decommissioned lithium-ion power batteries are scarce resources with high recycling value. If they are not handled properly, they will cause great waste of resources and environmental pollution. [0003] The current recycling process is generally aimed at a certain type of lithium-ion battery. A series of combined steps such as dismantling and crushing, high-temperature melting, and we...

Claims

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Application Information

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IPC IPC(8): H01M10/54H01M10/0525
CPCH01M10/0525H01M10/54Y02E60/10Y02W30/84
Inventor 朱能武胡志霖吴平霄
Owner SOUTH CHINA UNIV OF TECH
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