Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of regeneration method of spent lithium-ion battery cathode material

A technology for lithium-ion batteries and positive electrode materials, which is applied in the field of regeneration of waste lithium-ion battery positive electrode materials, can solve the problems of low recovery rate, small amount of lithium supplementation, high cost, etc., and achieve improved recycling rate, uniform and sufficient lithium supplementation, and high performance small difference effect

Active Publication Date: 2022-04-15
CENT SOUTH UNIV
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The extraction of valuable metal elements usually adopts pyrometallurgy or hydrometallurgy to recover organic metal elements in the form of salts, and then prepare high-purity salts or catalysts through certain methods. This method is currently a common method. It has the characteristics of simple principle, convenient operation and various products, but also has the disadvantages of long process and low recovery rate.
Regeneration of positive electrode materials includes two methods: synthesis and direct regeneration. Synthesis means that the waste lithium-ion battery positive electrode material is dissolved by acid leaching to obtain inorganic salts, and then new positive electrode materials are synthesized by co-precipitation or gel-sol method. This method is complicated in process and high in cost; direct regeneration is to restore the composition and structure of the positive electrode material to the original state through lithium supplementation and phase transformation of the spent lithium ion battery positive electrode material. The phase change is mainly obtained through high-temperature process or chemical reaction. This method has the advantages of simple process and high material reuse rate, but there are still problems such as small amount of lithium supplementation and uneven distribution of lithium in the process of heat treatment, which leads to the failure of recycled materials. There are some differences between some properties and those exhibited by commercial cathode materials

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 regeneration method of spent lithium-ion battery cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Mix lithium salt with a mass ratio of 8:1.6 and additives to form an electrolyte. The lithium salt is composed of lithium nitrate (LS1) and lithium acetate (LS2) with a mass ratio of 7:3. The additive is composed of a mass ratio of 4.5 : 2.5 composed of A1 and A2, A1 is composed of potassium hydroxide, sodium hydroxide, sodium chloride and potassium chloride with a mass ratio of 5:2:1:1, and A2 is composed of a mass ratio of 4:2:1:1: 1 glucose, arabinose, dextrin, pyridine and amino acid composition;

[0036] (2) Cut the disassembled NCM ternary positive electrode into 5cm×10cm pole pieces, wash them with absolute ethanol for 2 times, and then wash them with deionized water for 2 times; then wash the pole pieces with secondary amino anions The exchange membrane is wrapped as the cathode, the graphite electrode is the anode, and the lithium concentration is 6mol L -1 The electrolysis is carried out in the electrolyte solution, the electrolysis voltage is 4.5V, and t...

Embodiment 2

[0057] (1) Mix lithium salt with a mass ratio of 8:1.4 and additives to form an electrolyte. The lithium salt is composed of lithium nitrate and lithium acetate with a mass ratio of 6:4, and the additives are A1 and A2 with a mass ratio of 3:2. Composition, A1 is composed of potassium hydroxide, sodium hydroxide, sodium chloride and potassium chloride with a mass ratio of 4:1.5:0.5:1, and A2 is composed of glucose and arabinose with a mass ratio of 3:1.5:1:0.5:1 , dextrin, pyridine and amino acids.

[0058] (2) Cut the dismantled NCM ternary positive electrode into a 10cm×15cm pole piece, wash it twice with absolute ethanol, and then wash it twice with deionized water; then wash the pole piece with a secondary amino anion The exchange membrane is wrapped as the cathode, the graphite electrode is the anode, and the lithium concentration is 4mol L -1 The electrolysis is carried out in the electrolyte solution, the electrolysis voltage is 3.5V, and the current density is 90mA·cm...

Embodiment 3

[0061] (1) The lithium salt with a mass ratio of 7:1.2 is mixed with additives to form an electrolyte. The lithium salt is composed of lithium nitrate and lithium acetate with a mass ratio of 5:3, and the additives are A1 and A2 with a mass ratio of 2.5:1.5. Composition, A1 is composed of potassium hydroxide, sodium hydroxide, sodium chloride and potassium chloride with a mass ratio of 3:1:0.5:0.5, and A2 is composed of glucose and arabinose with a mass ratio of 2:1:0.5:0.5:0.5 , dextrin, pyridine and amino acids;

[0062] (2) Cut the disassembled NCM ternary positive electrode into a 15cm×20cm pole piece, wash it twice with absolute ethanol, and then wash it twice with deionized water; then wash the pole piece with a secondary amino anion The exchange membrane is wrapped as the cathode, the graphite electrode is the anode, and the lithium concentration is 2mol L -1 The electrolysis is carried out in the electrolyte solution, the electrolysis voltage is 2.5V, and the current ...

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 discloses a method for regenerating a positive electrode material of a waste lithium ion battery, which comprises the following steps: (1) mixing a lithium salt with an additive to prepare an electrolyte solution, the lithium salt is composed of lithium salt LS1 and lithium salt LS2; the additive is composed of Composed of Additive A1 and Additive A2; (2) The lithium-ion battery positive pole sheet obtained by dismantling is used as the cathode, the cathode is wrapped with a strong alkaline anion exchange membrane, the inert electrode is the anode, and the voltage is (2.5-4.5) V Carrying out electrolysis under the condition that the electrolytic solution of step (1) exists; (3) peeling off the positive electrode material from the pole piece after electrolysis, and mixing the lithium source and the positive electrode material by mass ratio (1-2): 1 for heat treatment, After cooling, wash and dry to obtain the regenerated positive electrode material. The invention realizes sufficient and uniform lithium supplementation of waste positive electrode materials through electrolysis, shortens the time for lithium supplementation, and combines heat treatment to restore the material structure to realize effective regeneration of waste positive electrode materials.

Description

technical field [0001] The invention belongs to the technical field of recycling waste batteries, and in particular relates to a method for regenerating positive electrode materials of waste lithium-ion batteries. [0002] technical background [0003] Due to its excellent electrochemical performance, lithium-ion batteries have become the main energy storage devices for portable electronic devices and electric vehicles. In recent years, the output of lithium-ion batteries has continued to increase with the growth of market demand, and the number of scrapped batteries has also increased. , it is estimated that by 2030, the number of waste lithium-ion batteries will exceed 11 million tons, and there are still a large number of valuable metal elements and organic substances in lithium-ion batteries, which have certain economic and environmental benefits for their recycling. At present, the recovery and reuse of cathode materials for lithium-ion batteries are mainly the extractio...

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): H01M10/54H01M4/505H01M4/525H01M10/0525H01M10/42
CPCH01M10/54H01M10/4242H01M4/505H01M4/525H01M10/0525H01M2004/028Y02W30/84Y02E60/10
Inventor 田忠良程皓郭春汪滔李铮赖延清
Owner CENT SOUTH UNIV