Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of recycling method for lifepo4 battery positive electrode

A recycling method and battery positive electrode technology, applied in battery recycling, recycling technology, recycling by waste collectors, etc., can solve the problems affecting the recovery rate and the purity of recycled products, high energy consumption, environmental pollution, etc., and achieve a thorough leaching effect. Effect of Simplified Recycling Steps

Active Publication Date: 2015-08-19
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent applications CN102903985A (application number 201210406015.9) and CN102891345A (application number 201210404254.0) disclose the use of high-temperature heating to separate the positive current collector from the active material, but this high-temperature heating method not only consumes high energy, but also may cause certain environmental pollution ; CN101847763A (application number is 201010148325.6), CN102664294A (application number is 201210152784.0) discloses the use of organic solvents to separate the positive current collector from the active material, but the use of a large amount of organic solvents may cause pollution to the environment; CN102664294A (application number is 201210152784.0) published In order to separate the positive current collector from the active material by alkali dissolution method, but only dissolve part of LiFePO 4 Active substances, affecting their recovery rate and purity of recovered products

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
  • A kind of recycling method for lifepo4 battery positive electrode
  • A kind of recycling method for lifepo4 battery positive electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] One for LiFePO 4 The recycling method of battery positive electrode comprises the following steps:

[0021] a. LiFePO with an aluminum-plastic soft package 4 Remove the shell after the battery (capacity 20Ah, voltage 3.2V) is discharged, and separate the positive, negative and diaphragm;

[0022] b. Completely immerse about 270g of the positive plate in 540mL of hydrochloric acid solution with a concentration of 1% by mass, soak for 10min, take out the aluminum foil current collector, rinse with water until there is no acid residue on the surface, weigh 40g after air drying, and the recovery rate is 96.1%;

[0023] c. Add 183.4mL concentrated hydrochloric acid (36.5% mass concentration) to the solution obtained in step b to adjust the mass concentration of hydrochloric acid in the solution to 10%, heat to 80°C, react for 5h, and then filter to remove the conductive agent and binder ;

[0024] d. Add concentrated ammonia water to the filtrate obtained in step c, adjus...

Embodiment 2

[0030] One for LiFePO 4 The recycling method of battery positive electrode comprises the following steps:

[0031] a. Put 2 aluminum shells LiFePO 4 Remove the shell after the battery (capacity 15Ah, voltage 3.2V) is discharged, and separate the positive, negative and diaphragm;

[0032] b. Completely immerse about 600g of the positive plate in 1.8L of sulfuric acid solution with a concentration of 4% by mass, soak for 5min, take out the aluminum foil current collector, rinse with water until there is no acid residue on the surface, weigh 87.6g after air drying, and the recovery rate is 96.8%;

[0033] c. Add 370 mL of concentrated sulfuric acid (98% mass concentration) to the solution obtained in step b, adjust the mass concentration of sulfuric acid in the solution to 20%, heat to 90°C, react for 2 hours, and filter to remove the conductive agent and binder;

[0034] d. Add solid sodium hydroxide to the filtrate obtained in step c, adjust the pH of the solution to 2.5, hea...

Embodiment 3

[0039] One for LiFePO 4 The recycling method of battery positive electrode comprises the following steps:

[0040] a. Put 4 steel shell LiFePO 4Remove the casing after the battery (capacity 18Ah, voltage 3.2V) is discharged, and separate the positive, negative and diaphragm;

[0041] b. Completely immerse about 1.3kg of the positive plate in 5.2L of sulfuric acid solution with a mass percentage concentration of 8%, soak for 10min, take out the aluminum foil current collector, rinse with water until there is no acid residue on the surface, weigh 202.8g after air drying, and the recovery rate is 97.5% ;

[0042] c. Add 1.6L concentrated sulfuric acid (98% mass concentration) to the solution obtained in step b to adjust the mass concentration of sulfuric acid in the solution to 30%, heat to 100°C, react for 1 hour, and filter to remove the conductive agent and binder;

[0043] d. Add solid potassium hydroxide to the filtrate obtained in step c, adjust the pH of the solution to...

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

No PUM Login to View More

Abstract

The invention relates to a method for recycling a positive electrode of a LiFePO4 battery. The method comprises the following steps: a, discharging and shelling the LiFePO4 battery, and separating the positive electrode, a negative electrode and a diaphragm; b, completely immersing a positive electrode plate into acid and taking out an aluminum foil current collector; c, adding acid into a leaching solution which is separated from the aluminum foil in the step b, and filtering and removing a conductive agent and an adhesive; d, adding alkali into the filtrate obtained in the step c, adjusting the pH value of the solution, filtering, and washing and drying a filter cake to obtain FePO4; e, adding alkali into the filtrate obtained in the step d, adjusting the pH value of the solution to be more than or equal to 12, heating, filtering, dissolving a solid compound obtained by filtration into the leaching solution obtained in the step b and extracting for the second time; and f, heating, concentrating and boiling the filtrate obtained in the step e, adding a Na2CO3 solution, reacting for 10 minutes to 1 hour, filtering and drying to obtain a pure Li2CO3 product. The method is simple and efficient.

Description

technical field [0001] The content of the present invention belongs to the technical field of recycling and processing of waste batteries, in particular to a battery for LiFePO 4 Recycling method of battery positive electrode. Background technique [0002] With the promotion and use of electric vehicles, there are more and more scrapped power batteries; the ensuing problem is the recycling and disposal of used power batteries. Power batteries for electric vehicles contain metal materials such as lead, nickel, cobalt, and lithium and electrolytes. Therefore, waste power batteries are a valuable urban mineral. Once the discarded batteries cannot be effectively recycled, it will not only cause a waste of resources, but also cause certain pollution to the environment. Therefore, waste power batteries must be recycled. [0003] LiFePO 4 There are two main difficulties in the recycling of battery positive electrode materials, one is to realize the complete stripping of the alu...

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 Patents(China)
IPC IPC(8): H01M10/54
CPCY02W30/84
Inventor 李东梅赵光金何睦唐国鹏王锋超
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com