Method for recycling positive electrode material of waste ternary lithium ion battery

A technology for lithium ion batteries and positive electrode materials, which is applied in the field of recycling and reuse of positive electrode materials of waste ternary lithium ion batteries, can solve the problems of destroying the crystal structure of positive electrode materials, unfavorable to green environmental protection, harmful toxicity, etc., and achieves simple process and large-scale realization. applied effect

Inactive Publication Date: 2020-12-08
HEFEI GUOXUAN HIGH TECH POWER ENERGY
View PDF12 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, metallurgy aims to obtain metal element, oxide or ion solution, which will inevitably destroy the original crystal structure of the positive electrode material and cannot be directly reused.
If it is reused later, it needs to be processed into a precursor, which is not only time-consuming and laborious, but also produces environmental pollutants again
Although many solutions have been proposed for the recovery of positive electrode materials in the prior art, such as direct recovery and re-preparation of positive electrode materials, a large amount of harmful and toxic organic solvents are used in the process of stripping the positive electrode material from the aluminum foil, which is not conducive to environmental protection; For example, the positive electrode material is directly recovered by the all-dry purification method. Although the process is simple and economically feasible, a large amount of harmful gas will be generated during the low-temperature heating binder failure process, which will pollute the environment.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for recycling positive electrode material of waste ternary lithium ion battery
  • Method for recycling positive electrode material of waste ternary lithium ion battery
  • Method for recycling positive electrode material of waste ternary lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] In this embodiment, a method for recycling the positive electrode material of a waste ternary lithium-ion battery, the specific steps are as follows:

[0047] Mix the NCM811 waste ternary lithium ion positive pole piece with the thiourea solution at a mass ratio of 1:5, completely soak the positive pole piece in the thiourea solution, heat to 60°C, and sonicate for 8 hours. Then, remove the aluminum foil;

[0048] The slurry after removing the aluminum foil was subjected to pressure filtration, wherein the pressure of the filter press was 0.12 MPa, to obtain filtrate and filter cake respectively. Then, the filter cake is vacuum-dried in an oven at 200°C, and the dried filter cake is separated from the dried filter cake by winnowing the ternary positive electrode material and the conductive agent;

[0049] The separated ternary cathode material is mechanically crushed and sieved to obtain a particle size D 50 Particles of 3.5 μm;

[0050] The sieved ternary positive e...

Embodiment 2

[0057] In Example 1, the NCM811 waste ternary lithium ion positive pole piece was replaced with NCM523 waste ternary lithium ion positive pole piece, and the steps of peeling off the aluminum foil, press filtration, winnowing and mechanical crushing were the same as in Example 1. Then, the particle size after mechanical crushing meets the requirements (D 50 =2~5μm) of the ternary positive electrode material for ICP element analysis to obtain the ratio of lithium to the total mass of transition metal elements, and then supplement Li according to the molar ratio of lithium to transition metal elements Li / M=1:1.13 2 CO 3 Finally, place it in a muffle furnace, in an air atmosphere, raise the temperature from room temperature to 500°C, keep it warm for 5 hours, then raise the temperature to 970°C, and keep it warm for 15 hours. Finally, it was naturally cooled to room temperature to obtain NCM523 ternary single crystal cathode material. A button cell was assembled in the same man...

Embodiment 3

[0059] In this example, the waste NCM622 ternary lithium ion positive pole pieces were soaked in dichloromethane solution, heated and ultrasonicated, followed by press filtration, winnowing, mechanical pulverization and ICP elemental analysis. The steps were the same as in Example 1. Then, according to the ratio of the total molar ratio of lithium to transition metal elements of 1:1.09, Li 2 CO 3 Finally, put it in the muffle furnace, keep the box pressure at 60MPa, in the air atmosphere, first raise the room temperature to 500°C, keep it for 5h, then raise it to 950°C, and keep it for 15h. Finally, it was naturally cooled to room temperature to obtain NCM622 ternary single crystal cathode material. A button cell was assembled in the same manner as in Example 1, and the electrochemical performance test results are shown in Table 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for recycling a positive electrode material of a waste ternary lithium ion battery. The method comprises the following steps: separating a current collector and positive electrode slurry from a positive electrode piece of the waste ternary lithium ion battery through a separating agent; carrying out filter pressing on the positive electrode slurry to obtain a filter cake, carrying out vacuum drying on the filter cake, carrying out winnowing, and separating out a positive electrode material and a conductive agent; and mechanically crushing the separated positiveelectrode material, screening to obtain positive electrode particles with an appropriate particle size range, supplementing lithium to the positive electrode particles, and calcining to obtain the ternary single crystal positive electrode material. The recycling method is environment-friendly in process and simple to operate, and the ternary single crystal positive electrode material prepared again is excellent in performance.

Description

technical field [0001] The invention belongs to the technical field of regeneration of waste batteries, and in particular relates to a method for recycling anode materials of waste ternary lithium-ion batteries. Background technique [0002] In recent years, with the encouragement and support of national policies, my country's new energy vehicle industry has developed rapidly, and the development of the new energy vehicle industry has also promoted the development of lithium-ion batteries. At the same time of rapid development, it is also facing many challenges. The extensive use of lithium-ion batteries makes its recycling also face problems. [0003] Waste lithium-ion batteries contain a large amount of valuable metal elements such as nickel, cobalt, manganese, iron, lithium, aluminum, and copper, and organic solvents such as electrolytes. If they are discarded directly, it will not only lead to waste of resources, but also cause environmental pollution. Therefore, how to...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54H01M10/0525
CPCH01M10/0525H01M10/54H01M2004/028Y02E60/10Y02W30/84
Inventor 闵长青王振昆龙君君张二冬丁楚雄曹利娜
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap