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Carbon dot composite conductive agent and preparation method and application thereof

A technology of composite conductive agent and carbon dots, which is applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc. Conductivity and other issues, to achieve the effect of prolonging mixing stability, inhibiting agglomeration, and ensuring conductivity

Pending Publication Date: 2021-11-16
东莞维科电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the existing conductive materials such as carbon nanotubes, graphene and other carbon materials are often difficult to disperse in solvents, and the processability of stirring and homogenizing with other materials is poor, and it is difficult to effectively disperse evenly on the surface of the active material, thereby affecting the overall conductivity of the pole piece and further Affect the electrical performance of lithium-ion batteries

Method used

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  • Carbon dot composite conductive agent and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0036] (1) Preparation of conductive carbon dot materials:

[0037] Add 1,3-dihydroxynaphthalene and potassium periodate into ethanol solvent in a ratio of 1:4 to dissolve, then transfer the solution to a high-temperature and high-pressure reactor and heat it to 180°C for 2 hours to react to synthesize the precursor. Naturally cooled to room temperature, the purified precursor conductive carbon dot material was obtained by dialysis.

[0038] (2) Preparation of carbon dot composite conductive agent:

[0039]The mass ratio of conductive carbon dot materials, multi-walled carbon nanotubes: polyvinylidene fluoride is 5:1:10;

[0040] Mix conductive carbon dot materials and multi-walled carbon nanotubes at a mass ratio of 5:1, and then add the mixed mixture to polyvinylidene fluoride at a mass ratio of 6:10 in N-methylpyrrolidone solvent. Stir for 60 minutes to obtain a mixed solution with a mass concentration of 50wt%; continue to add N-methylpyrrolidone to dilute the mixed solu...

Embodiment 2

[0048] This embodiment provides a lithium-ion battery, and the difference from Embodiment 1 is step (3):

[0049] The mass ratio of nickel cobalt lithium manganese oxide: carbon dot composite conductive agent: polyvinylidene fluoride is 97.5:1:1.5 during the preparation process of the positive electrode sheet.

[0050] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0052] This embodiment provides a lithium-ion battery, and the difference from Embodiment 1 is step (3):

[0053] The mass ratio of nickel cobalt lithium manganese oxide: carbon dot composite conductive agent: polyvinylidene fluoride is 97.5:1.5:1 during the preparation process of the positive electrode sheet.

[0054] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a carbon dot composite conductive agent and a preparation method and application thereof. The preparation method comprises the following steps: mixing 1, 3-dihydroxy naphthalene and potassium periodate according to the mass ratio of 1: 2-1: 8, synthesizing a precursor through solvothermal reaction, and dialyzing or centrifuging the precursor to obtain a conductive carbon dot material; mixing a conductive carbon dot material and a multi-walled carbon nanotube, adding a mixture obtained through mixing and a dispersing agent into a solvent according to a certain mass ratio, performing high-viscosity stirring, dilution and ultrasonic dispersion, and obtaining the carbon dot composite conductive agent. The invention also discloses a positive plate, a negative plate and a lithium ion battery comprising the carbon dot composite conductive agent. When the conductive agent obtained by the preparation method is applied to the lithium ion battery, the dispersing capacity of a conductive material in a solvent can be improved, the processing performance of conductive slurry is improved, and the conductivity of the lithium ion battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a carbon-dot composite conductive agent and its preparation method and application. Background technique [0002] At the moment when 3C electronic products are updated and iterated in an endless stream, the performance of lithium-ion batteries as the basic components of electronic products affects the overall performance of electronic products to a certain extent, especially the fast charging performance and battery capacity of batteries directly affect the battery life of electronic products. The performance of the ability has attracted more attention. On the one hand, these performances are limited by the upper limit of the energy density of positive and negative active materials and the bottleneck of battery structure design. On the other hand, it also prompts researchers to continuously explore the improvement effect of additives other than active su...

Claims

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Application Information

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IPC IPC(8): H01B1/24H01B13/00H01M4/13H01M4/62H01M10/0525
CPCH01B1/24H01M4/625H01M4/13H01M10/0525H01B13/00Y02E60/10
Inventor 泉贵岭胡小勇李莉阳玉凤李喜福王旭辉王晶晶
Owner 东莞维科电池有限公司
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