Method for eliminating residual lithium by lithium transition metal oxide and application thereof

A lithium transition metal, non-metal oxide technology, applied in chemical instruments and methods, nickel compounds, cobalt compounds, etc., can solve problems such as electrochemical performance degradation, surface structure damage, material structure deterioration, etc., to achieve improved cycle performance, Effects of low surface lithium residues, good cycle performance and safety

Active Publication Date: 2020-11-17
GUANGDONG BRUNP RECYCLING TECH +2
View PDF7 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the water washing process will increase the cost of use. More importantly, the lithium transition metal oxide material is sensitive to moisture. If the drying time is too long, the contact time between the material and moisture will be too long, and the lattice lithium on the surface will be missing, resulting in the material Structural deterio

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 eliminating residual lithium by lithium transition metal oxide and application thereof
  • Method for eliminating residual lithium by lithium transition metal oxide and application thereof
  • Method for eliminating residual lithium by lithium transition metal oxide and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment provides a lithium transition metal oxide with a crystalline surface layer, the lithium transition metal oxide is high-nickel-nickel-cobalt lithium manganese oxide, and the crystalline surface layer is composed of crystalline boron oxide, aluminum oxide, titanium oxide, Composed of manganese oxide and trace residual lithium. The mass ratio percentage of the crystalline surface layer to the high-nickel-nickel-cobalt lithium manganese oxide is about 0.35%. Among them, titanium oxide, aluminum oxide and manganese oxide account for about 15% of the mass fraction of the crystalline surface layer, and the rest is mainly about 85% of crystalline boron oxide and trace residual lithium absorbed by high-nickel-nickel-cobalt lithium manganese oxide.

[0051] This lithium complex is obtained by absorbing residual lithium through lithium-absorbing agent of high-nickel-nickel-cobalt manganese oxide, and the specific steps include:

[0052] (1) Uniformly mix amorphous...

Embodiment 2

[0057] This embodiment provides a lithium transition metal oxide with a crystalline surface layer, the lithium transition metal oxide is lithium nickel cobalt aluminate, and the crystalline surface layer is composed of crystalline silicon oxide, cobalt oxide, titanium oxide, and yttrium oxide. and trace amounts of residual lithium. The mass ratio percentage of the crystalline surface layer to lithium nickel cobalt aluminate is about 3%. Among them, cobalt oxide, titanium oxide, and yttrium oxide account for about 20% of the mass fraction of the crystalline surface layer, and the rest is mainly about 80% of crystalline silicon oxide and trace residual lithium absorbed by nickel-cobalt lithium aluminate.

[0058] This lithium complex is obtained by absorbing residual lithium through a lithium absorbing agent through nickel-cobalt-aluminate lithium, and the specific steps include:

[0059] (1) Uniformly mix amorphous silicon oxide, cobalt oxide, titanium oxide, yttrium oxide and...

Embodiment 3

[0063] This embodiment provides a lithium transition metal oxide with a crystalline surface layer, the lithium transition metal oxide is low nickel nickel cobalt lithium manganese oxide, the crystalline surface layer is composed of crystalline phosphorus oxide, magnesium oxide, zirconium oxide and Composed of tungsten oxide and trace residual lithium. The mass ratio percentage of the crystalline surface layer to the low-nickel-nickel-cobalt lithium manganese oxide is about 1.5%. Among them, magnesium oxide, zirconium oxide and tungsten oxide account for about 25% of the mass fraction of the crystalline surface layer, and the rest is mainly about 75% of crystalline phosphorus oxide and trace residual lithium absorbed by low-nickel-nickel-cobalt lithium manganate.

[0064] The method used refers to Example 1, the difference is that the heat treatment and tempering are in air atmosphere, the heat treatment is sintering at 700° C. for 8 hours, and the tempering treatment is at 500...

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 provides a method for removing residual lithium from lithium transition metal oxide and application of the method. The method comprises the following steps: coating lithium transition metal oxide with a lithium absorbing agent, and carrying out heat treatment to form an amorphous surface layer; the amorphous surface layer is converted into a crystalline surface layer through crystallization treatment; the lithium absorbing agent comprises an amorphous substance. The method at least has the following beneficial effects that after the lithium transition metal oxide is coated with the amorphous substance, the amorphous substance has a very strong tendency of combining residual lithium under a heat treatment condition, the content of the residual lithium on the surface of the material can be greatly reduced, and meanwhile, the capacity reduction caused by lithium loss is avoided by absorbing the residual lithium on the surface; and then the amorphous state is converted into the crystalline state, so that crystal lattices are more complete, and the problem that the surface structure of the material is damaged due to energy release in the process of converting the amorphouslong-range disordered metastable state into the crystalline state and the resulting problem of battery attenuation are avoided; therefore, the electrochemical performance of the material is effectively ensured not to be reduced due to elimination of residual lithium on the surface.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a method for eliminating residual lithium by a lithium transition metal oxide and an application thereof. Background technique [0002] Residual lithium usually refers to the residual soluble Li on the surface of lithium transition metal oxide powder materials 2 CO 3 And LiOH, the problem of residual lithium has a great impact on the battery. In the process of making rechargeable batteries and coating slurry, high residual lithium will make the slurry unstable, accelerate the gelation of the slurry, and weaken the uniformity of the battery. , and the high residual lithium on the surface of the positive electrode material is easy to react with the electrolyte to cause gas generation, which reduces the safety performance and cycle performance of the battery. There are two main sources of residual lithium on the surface of lithium transition metal oxide powders: first, d...

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
IPC IPC(8): C01G45/12C01G51/00C01G53/00H01M4/505H01M4/525H01M4/485H01M4/58H01M10/052
CPCC01G53/44C01G53/42C01G51/42C01G45/1214H01M4/505H01M4/525H01M4/485H01M4/5825H01M10/052C01P2006/80C01P2002/72Y02E60/10
Inventor 李斌阮丁山毛林林李玲吴星宇李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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