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

Regeneration method and application of waste lithium ion battery negative electrode graphite material

A technology of lithium ion battery and graphite material, which is applied to the regeneration method and preparation field of graphite negative electrode material of waste lithium ion battery, can solve the problems of surface structure damage of graphite negative electrode, irreversible capacity loss, cycle performance decline, etc., and is beneficial to industrialization. Mass production, moderate particle size, improved electrical properties

Inactive Publication Date: 2021-05-14
SHANDONG YUHUANG NEW ENERGY TECH
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are problems in the recycling and regeneration of graphite materials for the negative electrodes of waste lithium-ion batteries. The surface structure of the graphite negative electrodes is destroyed during the cycle, forming surface defects. At the same time, the graphite negative electrodes and the electrolyte are irreversibly hardened, resulting in irreversible capacity loss and cycle performance decline. Seriously, these problems are still major problems in the recycling and regeneration of spent lithium-ion battery anode graphite 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
  • Regeneration method and application of waste lithium ion battery negative electrode graphite material
  • Regeneration method and application of waste lithium ion battery negative electrode graphite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A kind of regeneration method of spent lithium-ion battery negative electrode graphite material, the method comprises the following steps:

[0041] (1) Immerse the current collector with graphite and copper foil in water for 30 minutes, so that the graphite on the current collector is separated from the copper foil, and take out the copper foil; the graphite is filtered and dried to obtain the graphite raw material;

[0042] (2) Pulverize the graphite raw material with a universal pulverizer, and pass through a 300-mesh sieve to obtain graphite powder with a particle size≤50 μm;

[0043] (3) Utilize the Hummers method to prepare graphene oxide. The specific steps are: ① add flake graphite to concentrated sulfuric acid, add potassium permanganate under stirring conditions at 0°C, and stir at 15°C for 10min, so that the concentrated sulfuric acid and potassium permanganate Graphite preliminary graphite oxide;

[0044] ② Continue to stir for 30 minutes at a temperature of...

Embodiment 2

[0050] A kind of regeneration method of spent lithium-ion battery negative electrode graphite material, the method comprises the following steps:

[0051] (1) Immerse the current collector with graphite and copper foil in water for 40 minutes, so that the graphite on the current collector is separated from the copper foil, and take out the copper foil; the graphite is filtered and dried to obtain the graphite raw material;

[0052](2) Pulverize the graphite raw material with a universal pulverizer, and pass through a 300-mesh sieve to obtain graphite powder with a particle size≤50 μm;

[0053] (3) Utilize the Hummers method to prepare graphene oxide. The specific steps are: ① add flake graphite to concentrated sulfuric acid, add potassium permanganate under stirring conditions at 0°C, and stir at 10°C for 20min, so that the concentrated sulfuric acid and potassium permanganate Graphite preliminary graphite oxide;

[0054] ② Continue to stir for 25 minutes at a temperature of ...

Embodiment 3

[0060] A kind of regeneration method of spent lithium-ion battery negative electrode graphite material, the method comprises the following steps:

[0061] (1) Immerse the current collector with graphite and aluminum foil in water for 20 minutes, so that the graphite on the current collector is separated from the aluminum foil, and take out the aluminum foil; filter and dry the graphite to obtain the graphite raw material;

[0062] (2) Pulverize the graphite raw material with a universal pulverizer, and pass through a 300-mesh sieve to obtain graphite powder with a particle size≤50 μm;

[0063] (3) Utilize the Hummers method to prepare graphene oxide. The specific steps are: 1. add flake graphite to concentrated sulfuric acid, add potassium permanganate under stirring conditions at 2°C, and stir at 10°C for 5min, so that the concentrated sulfuric acid and potassium permanganate Graphite preliminary graphite oxide;

[0064] ② Continue to stir for 40 minutes at a temperature of ...

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

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Film diameteraaaaaaaaaa
Resistivityaaaaaaaaaa
Login to View More

Abstract

The invention provides a regeneration method and application of a waste lithium ion battery negative electrode graphite material. The regeneration method comprises the following steps: (1) screening the waste lithium ion battery negative electrode graphite material to obtain graphite powder of which the particle size is not greater than 50 [mu]m; (2) dispersing graphene oxide in water to obtain a graphene oxide solution; (3) mixing and stirring the graphite powder and the graphene oxide solution according to the mass ratio of the graphite powder to the graphene oxide in the graphene oxide solution of 1: (0.01-0.1), and then filtering to obtain a graphene oxide coated graphite material; and (4) calcining the graphene oxide coated graphite material in an oxygen-free environment to obtain the graphene coated graphite material. The waste graphite material is coated with graphene, and the graphene can fill up defects on the surface of the waste graphite material, so that the first coulombic efficiency, the cycle performance and other electrical properties of the regenerated graphite as the lithium ion battery negative electrode material are improved.

Description

technical field [0001] The invention belongs to the field of battery recycling, and in particular relates to a method for regenerating a negative electrode graphite material of a waste lithium ion battery, a preparation method and an application thereof. Background technique [0002] As a green and environmentally friendly secondary power source, lithium-ion batteries have developed rapidly in recent years due to their advantages such as high capacity, high specific energy, high working voltage, low self-discharge, good cycle performance, long service life, and no memory effect. A lithium-ion battery consists of a positive electrode, a negative electrode, a separator, an electrolyte, and a casing. Graphite is widely used in the negative electrode material of lithium-ion batteries because of its good electrical conductivity, orderly layered crystal structure, high reversible lithium storage capacity, low charge and discharge potential, long and stable platform, etc. While th...

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): H01M4/62H01M4/587H01M10/0525H01M10/54C01B32/20C01B32/215
CPCC01B32/20C01B32/215H01M4/587H01M4/628H01M10/0525H01M10/54H01M2004/021H01M2004/027Y02E60/10Y02W30/84
Inventor 王超武吴忠营肖双朱胜凯冯彩霞李新红马春响徐印东王瑛
Owner SHANDONG YUHUANG NEW ENERGY TECH