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Conductive composite material and preparation method and application thereof

A technology of conductive composite materials and conductive agents, applied in the direction of conductive materials dispersed in non-conductive inorganic materials, cable/conductor manufacturing, circuits, etc., can solve the problems of high production and storage costs

Pending Publication Date: 2022-07-15
诺瑞(深圳)新技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since lithium battery positive electrode slurry has high requirements on moisture content, and PVP and NMP are substances that are very easy to absorb water, the conductive agent slurry has relatively strict requirements on the environment during production and storage, and the production and storage costs are relatively high.

Method used

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  • Conductive composite material and preparation method and application thereof
  • Conductive composite material and preparation method and application thereof
  • Conductive composite material and preparation method and application thereof

Examples

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Embodiment 1

[0066] This embodiment discloses a conductive agent for lithium batteries. The preparation process includes: weighing 100 g of single-walled carbon nanotubes and 1900 g of polyvinylidene fluoride (PVDF), mixing them in a kneader for 30 minutes, and taking out the mixed materials to obtain premix. The setting parameters of the twin-screw extruder are 30 °C in the first zone and 190 °C in the second to sixth zones. After the temperature of the machine rises to the set temperature, the premix is ​​put into the feeding barrel of the twin-screw extruder, and the material is fed and extruded. After granulation, the granulated granules are dried and crushed to below 50 mesh to obtain a lithium battery conductive agent. Among them, the molecular weight of polyvinylidene fluoride is 1.2 million, the length of single-walled carbon nanotubes is 5-10 μm, and the specific surface area is 800 m 2 / g.

[0067] This embodiment discloses a lithium battery positive electrode material. The pre...

Embodiment 2

[0069] This embodiment discloses a lithium battery conductive agent, the preparation process of which includes: weighing 400 g of multi-walled carbon nanotubes and 1600 g of polyvinylidene fluoride (PVDF), mixing in a kneader for 30 minutes, taking out the mixed materials, Get a premix. The setting parameters of the twin-screw extruder are 30°C in the first zone and 220°C in the second to sixth zones. After the temperature of the machine rises to the set temperature, the premix is ​​put into the feeding barrel of the twin-screw extruder, and the feed is extruded. After granulation, the granulated granules are dried and crushed to below 50 mesh to obtain a lithium battery conductive agent. Among them, the molecular weight of polyvinylidene fluoride is 1.2 million, the length of multi-walled carbon nanotubes is 5-10 μm, and the specific surface area is 400 m 2 / g.

[0070] This embodiment discloses a lithium battery positive electrode material. The preparation process includes...

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Abstract

The invention discloses a conductive composite material and a preparation method and application thereof. The preparation method comprises the following step: carrying out spiral extrusion treatment on a mixture of the carbon nanotubes and the fluorine-containing polymer to obtain the conductive composite material. The conductive composite material is prepared by adopting a dry method and can be directly used for preparing the battery positive electrode slurry, a dispersing agent and a solvent do not need to be introduced in the preparation process, the production cost is low, the preparation condition is simple and mild, the production efficiency is high, and the prepared conductive composite material is solid, low in storage environment requirement and low in packaging, transportation and storage cost.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a conductive composite material and a preparation method and application thereof. Background technique [0002] In recent years, carbon nanotubes, as one-dimensional nanomaterials with high aspect ratio, high conductivity and high flexibility, have been widely used in the field of lithium batteries. An effective conductive network can be formed in the electrode material, which greatly improves the capacity and cycle performance of the battery. Lithium battery cathode slurry generally contains active material, binder, solvent and conductive agent. The conductive agent includes conductive carbon black SP and carbon nanotubes. Due to the high specific surface and high aspect ratio of carbon nanotubes, it is difficult to disperse. In order to fully play its role, the conductive agent is generally made into a conductive agent paste. Among them, the conductive ...

Claims

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Application Information

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IPC IPC(8): H01B1/24H01B13/00H01M4/62
CPCH01B1/24H01B13/00H01B13/0016H01M4/625
Inventor 张新杰林桥
Owner 诺瑞(深圳)新技术有限公司
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