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A kind of nanometer composite positive electrode lithium supplement slurry and positive electrode

A composite cathode, nanotechnology, applied in the direction of positive electrode, nanotechnology, nanotechnology, etc., can solve the problem that the catalytic effect needs to be further improved, and achieve the effect of good contact, lower decomposition potential, and higher battery charging capacity.

Active Publication Date: 2022-07-26
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent 201810933152.5; CN202010920245.1 discloses the method of reducing the decomposition point by adding a catalyst, but the catalytic effect needs to be further improved

Method used

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  • A kind of nanometer composite positive electrode lithium supplement slurry and positive electrode
  • A kind of nanometer composite positive electrode lithium supplement slurry and positive electrode
  • A kind of nanometer composite positive electrode lithium supplement slurry and positive electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This example is used to illustrate the composite positive electrode lithium supplement slurry and the positive electrode provided by the present invention.

[0038] (1) Preparation of catalyst

[0039] Weigh 1.16g of molybdenum trioxide (MoO 3 ) and 0.4g of carbon nanotubes (CNTs), were added to a ball-milling jar containing balls of different sizes, wherein the ball-to-material ratio was controlled at 20:1, ball-milled at 300rpm for 24h, and then the ball-milled material was placed in a tubular In the furnace, the temperature was raised to 950 °C at a heating rate of 5 °C / min, and sintered for 4 h to obtain Mo nanotube cross-linked. 2 C nanoparticle catalyst, denoted as M1.

[0040] (2) Detection of catalysts

[0041] Field emission scanning electron microscope of M1 (TESCAN MIRA LMS, Czech Republic, accelerating voltage 15 kV) as shown in the picture figure 1 shown, it can be seen from the figure that Mo in M1 2 The C particles are approximately spherical, and th...

Embodiment 2

[0047] This example is used to illustrate the composite positive electrode lithium supplement slurry and the positive electrode provided by the present invention.

[0048] In this embodiment, except that the conditions in the following table 1 are different from those in embodiment 1; and, in step (3), the content of the organic lithium-replenishing material is 90%, and the content of the catalyst is 10%; in step (4) ), the composite lithium supplement material: Super-P: PVDF: NMP = 76:15:9:150, at this time, relative to the composite cathode lithium supplementary slurry, the content of the conductive agent is 6%, and the content of the binder is 3.6%, except that the solvent content was 60%, the same method as in Example 1 was used to prepare a composite positive electrode lithium supplement slurry, and then the composite positive electrode lithium supplement slurry was used to prepare a positive electrode S2.

Embodiment 3

[0050] This example is used to illustrate the composite positive electrode lithium supplement slurry and the positive electrode provided by the present invention.

[0051] In this embodiment, except that the conditions in the following table 1 are different from those in embodiment 1; and, in step (3), the content of the organic lithium-replenishing material is 60%, and the content of the catalyst is 40%; in step (4) ), the composite lithium supplement material: Super-P: PVDF: NMP = 76:15:9:180, at this time, relative to the composite cathode lithium supplementary slurry, the content of the conductive agent is 5.4%, and the content of the binder is 3.2%, except that the solvent content is 64%, the same method as in Example 1 was used to prepare a composite positive electrode lithium supplement slurry, and then the composite positive electrode lithium supplement slurry was used to prepare a positive electrode S3.

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Abstract

The present invention provides a nanometer composite positive electrode lithium supplementing slurry, characterized in that the composite positive electrode lithium supplementing slurry contains a composite lithium supplementing material, and the composite lithium supplementing material contains: an organic lithium supplementing material and a catalyst, wherein the The organic lithium-replenishing material is a lithium carbon oxide, and the catalyst is a transition metal carbide; the catalyst is synthesized by high-temperature carbonization, and has a shape of nano-particles, nano-wires, or nano-sheets, and a particle size of nano-scale. The present invention effectively designs the structure of the catalyst and controls the particle size of the catalyst to be nano-scale, so that the contact between the catalyst and the lithium-replenishing material is good, so that the charging capacity of the battery can be improved, and the decomposition of the organic lithium-replenishing material can be effectively reduced. is the decomposition potential of active lithium.

Description

technical field [0001] The invention relates to a nanometer composite positive electrode lithium supplement slurry and a positive electrode made by the same. Background technique [0002] At present, commercial lithium secondary battery devices consume active lithium in the battery system during the first charge and discharge process and form a solid electrolyte interface (SEI) at the interface on the negative side, resulting in irreversible capacity loss, which in turn reduces lithium The energy density of the secondary battery device as a whole. For example, the currently commercialized graphitized carbon materials can only reach about 92% coulombic efficiency and about 8% irreversible capacity loss during the first charge-discharge process. [0003] In addition, due to the concept of carbon peaking and carbon neutralization, higher requirements have been placed on the energy density of lithium secondary batteries. However, graphitized carbon materials as negative electr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42H01M4/13B82Y30/00H01M4/02
CPCH01M10/4235H01M4/13B82Y30/00H01M2004/028
Inventor 谢佳钟伟张薇李思吾
Owner HUAZHONG UNIV OF SCI & TECH
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