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 problems such as extended time, complicated recycling process, and insufficient lithium supplementation, and achieves reduced interfacial tension, shortened process flow, and improved The effect of lithium supplementation efficiency

Active Publication Date: 2022-02-11
CENT SOUTH UNIV
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the recovery of waste lithium-ion batteries is mainly to recover the valuable metals in the form of salt through hydrometallurgy or pyrometallurgy and then apply them to other fields. It has the characteristics of various products, but the recovery process is complicated and the loss of metal elements is relatively high. large, low recovery
Considering the sustainable development of the battery industry, recycling waste cathode materials and then synthesizing new cathode materials is a current research hotspot. After recovering various metal elements, new cathode materials are prepared by co-precipitation or hydrothermal methods. The performance is better, but the process is complicated, the conditions are difficult to control, and the economic benefits shown are low
The direct regeneration of positive electrode materials is to restore the composition and structure of the material to the original state through lithium supplementation and heat treatment, and lithium supplementation and heat treatment are usually two intermittent processes, and prior to this, the binder and conductive agent need to be removed in advance, prolonging the The time required for the entire material regeneration process, due to problems such as insufficient lithium supplementation, leads to a certain difference between the electrochemical performance of the regenerated cathode material and the related performance of the commercial cathode material.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Strip the waste positive electrode material from the current collector, mix it with lithium salt and additives at a mass ratio of 1:5:3, and then ball mill it in a ball mill with stainless steel balls with a diameter of 0.5 cm at a speed of 800 rpm for 4 hours. With a ratio of 9:1, the resulting mixture had an average particle size of 0.5 mm. The mass ratio of each component in the lithium salt is LS1:LS2:LS3=2.5:1.5:1.5, and the mass ratio of each component in the additive is A1:A2=5:1, wherein the composition (mass ratio) of LS1 is lithium nitrate: Lithium hydroxide: lithium dihydrogen phosphate: lithium hexafluorophosphate=4:1:1:0.5, the composition (mass ratio) of LS2 is lithium chloride: lithium bromide: lithium iodide=2.5:1:0.5, the composition (mass ratio) of LS3 Lithium oxalate: lithium carbonate: lithium acetate: lithium bicarbonate = 5:2:1:1; the composition (mass ratio) of A1 is potassium nitrate: potassium hydroxide: potassium bicarbonate = 4:3:1.5, A2 i...

Embodiment 2

[0060] (1) Strip the waste positive electrode material from the current collector, mix it with lithium salt and potassium chloride in a mass ratio of 2:6:5, and then ball mill it with a stainless steel ball with a diameter of 0.7 cm at a speed of 600 rpm for 3.5 h in a ball mill, The ball to material mass ratio is 6:1, and the average particle size of the obtained mixture is 0.8mm. The mass ratio of each component in the lithium salt is LS1:LS2:LS3=2:2:1, and the mass ratio of each component in the additive is A1:A2=4:0.5, wherein the composition (mass ratio) of LS1 is lithium nitrate: Lithium hydroxide: lithium dihydrogen phosphate: lithium hexafluorophosphate=3:0.5:0.5:0.5, the composition (mass ratio) of LS2 is lithium chloride: lithium bromide: lithium iodide=2:0.5:1, the composition (mass ratio) of LS3 Lithium oxalate: lithium carbonate: lithium acetate: lithium bicarbonate = 4: 0.5: 0.5: 1; the composition (mass ratio) of A1 is potassium nitrate: potassium hydroxide: pot...

Embodiment 3

[0065] (1) Strip the waste positive electrode material from the current collector, mix it with lithium salt and potassium chloride in a mass ratio of 1:4:2, and then ball mill it with a stainless steel ball with a diameter of 1 cm at a speed of 450 rpm for 3 hours in a ball mill. The mass ratio was 5:2, and the average particle diameter of the obtained mixture was 1.1 mm. The mass ratio of each component in the lithium salt is LS1:LS2:LS3=3:2:2, and the mass ratio of each component in the additive is A1:A2=3:1, wherein the composition (mass ratio) of LS1 is lithium nitrate: Lithium hydroxide: lithium dihydrogen phosphate: lithium hexafluorophosphate = 5: 1.5: 1.5: 0, the composition (mass ratio) of LS2 is lithium chloride: lithium bromide: lithium iodide = 3: 1: 1, the composition (mass ratio) of LS3 Lithium oxalate: lithium carbonate: lithium acetate: lithium bicarbonate = 6: 2.5: 1: 1.5; the composition (mass ratio) of A1 is potassium nitrate: potassium hydroxide: potassium ...

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 the positive electrode material of a waste lithium ion battery. Composed of LS3; the additive is additive A1 or its composition with additive A2; under an oxidizing atmosphere, the above mixture is used as an electrolyte, and a working electrode and a counter electrode are used for electrolysis at (260‑500) ° C; after electrolysis, withdraw The working electrode and the counter electrode shall be kept under the oxidizing atmosphere at (7-12)°C·min ‑1 Heating to (600-680)°C, keeping for (0.3-1)h; then continue at (3-6)°C·min under an oxidizing atmosphere or an inert atmosphere ‑1 Heating to (800-1100)°C and keeping it for (3-8) h; after cooling, washing, filtering and drying to obtain a regenerated positive electrode material.

Description

technical field [0001] The invention belongs to the technical field of waste battery recycling, and in particular relates to a method for regenerating a positive electrode material of a waste lithium ion battery. [0002] technical background [0003] Since the commercialization of lithium-ion batteries, they have been widely used in all walks of life due to their many advantages, and the market share is also increasing year by year. Especially in recent years, the rapid development of new energy vehicles has promoted the research and application of ion batteries. It is estimated that the cumulative sales of new energy vehicles will exceed 5 million in 2020, which means that the number of scrapped lithium-ion batteries will increase rapidly in the future. Lithium-ion batteries contain a large amount of valuable metals and organic substances. Direct stacking will bring great harm to the ecological environment and cause waste of resources, so it is of great significance to rati...

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
CPCH01M10/54H01M10/4242H01M10/0525H01M4/505H01M4/525H01M2004/028Y02W30/84Y02E60/10
Inventor 田忠良程皓郭春李铮杨凯赖延清
Owner CENT SOUTH UNIV