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

A method for feeding back and rebuilding the lithium cobalt oxide structure of the positive electrode of the lithium battery

A lithium cobalt oxide and lithium battery technology, which is applied in the field of recycling waste lithium batteries, can solve the problems that the original form and size distribution of lithium cobalt oxide cannot be restored, the performance of new batteries cannot be compared, and the electrochemical performance is limited. Achieve the effects of relieving ecological pressure, increasing electrochemical specific capacity, and easy migration

Active Publication Date: 2022-05-24
ZHEJIANG UNIV OF TECH
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the powdered lithium cobaltate is not dissolved, but the lithium is directly supplemented by ultrasonic, the supplement of lithium is limited, and the original shape and size distribution of the initial hexagonal layered structure of the lithium cobaltate crystal cannot be restored, resulting in the migration of lithium ions in the positive and negative electrodes. It will produce a certain impedance, so that the improvement of electrochemical performance is limited, and it cannot be compared with the performance of a new battery

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 method for feeding back and rebuilding the lithium cobalt oxide structure of the positive electrode of the lithium battery
  • A method for feeding back and rebuilding the lithium cobalt oxide structure of the positive electrode of the lithium battery
  • A method for feeding back and rebuilding the lithium cobalt oxide structure of the positive electrode of the lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) First, disassemble the waste lithium-ion battery, immerse it in sodium chloride solution, and discharge it to obtain positive aluminum foil, which is cut into pieces with a size of 3-5cm. The positive electrode sheet was placed in a solution of DMF and NMP=1:3 (volume ratio), and immersed in ultrasonic immersion at a constant temperature of 80°C with a power of 100W for 2 hours. The positive electrode active material fell off, the aluminum foil was separated, the positive electrode active material was filtered out, and dried in a vacuum at 100°C to obtain a crude positive electrode active material product.

[0029] (2) Since some binders and carbon powders remain in the crude positive active material product, the crude active material obtained in step (1) is processed as follows: heating at 700° C. for 5 hours, Grind after cooling. A treated positive electrode active material was obtained.

[0030] (3) Weigh 5g (about 0.05mol cobalt ion) treated lithium cobalt oxi...

Embodiment 2

[0039] (1) The process of obtaining the treated positive active material is the same as in Example 1

[0040] (2) The positive active material was directly assembled into a button battery for testing. correspond figure 2 directly peeled off.

[0041] The preparation method and charge-discharge experiment of the button battery are the same as those in Example 1, and the results are shown in figure 2 .

Embodiment 3

[0043] (1) The process of obtaining the treated positive active material is the same as in Example 1

[0044] (2) Weigh 5g (about 0.05mol cobalt ion) treated lithium cobalt oxide positive active material into 20ml 8mol / L sulfuric acid solution, add 2.5ml 30% hydrogen peroxide to dissolve. The insoluble impurities are removed, and the filtrate contains cobalt ions and lithium ions and is ready for use.

[0045] To the filtrate obtained in (2), 12 g of solid lithium hydroxide was added to control Li / Co=10:1. 2.5ml of 30% hydrogen peroxide was added into a 50ml polytetrafluoroethylene reaction kettle, the filling amount was 0.8, and the reaction kettle was placed in an oven at 200° C. for reaction for 24h.

[0046] After the reaction is stopped, it is taken out by filtration, centrifuged with water and ethanol, and the obtained lithium cobalt oxide crystals are dried for 12 hours, and finally the lithium cobalt oxide cathode material after hydrothermal feed-feed reconstruction is ...

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

A method for feeding and rebuilding the lithium cobalt oxide structure of the positive electrode of the lithium battery, which is carried out according to the following steps: ① soak and discharge the waste lithium cobalt oxide battery in a sodium chloride solution, and disassemble to obtain the positive electrode material of the battery; ② put the positive electrode The material is ultrasonically soaked in a mixed organic solvent of DMF and NMP, and the obtained precipitate is then sintered, cooled and ground to obtain LixCoO 2 powder; ③ LixCoO 2 The powder is reacted with an inorganic acid solution containing hydrogen peroxide, and the cobalt element is dissolved and reformed, and the insoluble impurities are removed by filtration to obtain a Li + and Co 2+ 4. Add lithium hydroxide and oxidant solution to the leaching solution to obtain a mixed solution, control the molar ratio of lithium and cobalt in the mixed solution to be more than 10, pour the mixed solution into the reactor for hydrothermal reaction; 5. The product was centrifuged and the precipitate was washed and dried to obtain a lithium cobalt oxide crystal with a restructured structure. The invention has simple operation, low energy consumption, high efficiency, can reduce environmental pollution, and can maximize the value of wastes.

Description

(1) Technical field [0001] The invention relates to a method for recycling waste lithium batteries, in particular to a method for reproducing the structure of lithium cobalt oxide with a failed positive electrode in a lithium battery. [0002] (2) Technical background [0003] As a kind of energy storage equipment, lithium-ion batteries have been widely used in the fields of terminal electronic communication, new energy energy storage, electric vehicles, household appliances, aerospace and military due to the advantages of high energy density, long cycle life, high voltage and green environmental protection. Applications. After a huge number of lithium-ion batteries are discarded, it not only wastes resources but also pollutes the environment. If the resources in waste lithium batteries can be recycled, it can reduce the development of natural resources, provide a new way for sustainable economic and social development, have important economic and social benefits, and promot...

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): C01G51/00H01M10/54H01M4/525H01M10/0525
CPCC01G51/42H01M10/54H01M4/525H01M10/0525H01M2004/028Y02W30/84Y02E60/10
Inventor 郑松海夏银萍徐莹莹吴昊王连邦
Owner ZHEJIANG UNIV OF TECH
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