Composite conductive agent, preparation method thereof and application of composite conductive agent in positive electrode slurry

A composite conductive agent and composite conductive technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as affecting conductivity, high internal resistance, and easy electrode polarization.

Active Publication Date: 2019-06-04
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it only forms point-like conduction, and cannot form a point-line-plane conductive network. It has poor conductivity, high internal resistance, and easy electrode polarization. After the conductive agent without activation and surface cleaning is prepared into a conductive paste, it will Putting it in the air for a long time will make a lipid substance form on the surface, which will affect its own conductivity to a certain extent

Method used

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  • Composite conductive agent, preparation method thereof and application of composite conductive agent in positive electrode slurry
  • Composite conductive agent, preparation method thereof and application of composite conductive agent in positive electrode slurry
  • Composite conductive agent, preparation method thereof and application of composite conductive agent in positive electrode slurry

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Comparison scheme
Effect test

Embodiment 1

[0089] This embodiment provides a composite conductive agent, and the specific process for preparing the composite conductive agent is as follows:

[0090] 1. Preparation of acetylene black and conductive graphite mixed conductive agent (the first composite conductive paste)

[0091] The acetylene black and the conductive graphite were respectively cleaned with acetone, and dried in a vacuum drying oven. Add nano-aluminum powder and stir in the acetylene black after acetone cleaning and drying, obtain the acetylene black modified by nano-aluminum powder (the total mass of the acetylene black modified by nano-aluminum powder is 100%, the amount of the nano-aluminum powder mass percent is 5%).

[0092] Add the mixed acetylene black (i.e. the acetylene black modified by nano-aluminum powder) and conductive graphite into the NMP at a mass ratio of 1:0.5, wherein the solid content is 10-30%, and use a 700-800rpm high-speed stirrer (dispersion disc ) dispersed for 2-3h, put into t...

Embodiment 2

[0102] This embodiment provides a composite conductive agent, and the specific process for preparing the composite conductive agent is as follows:

[0103] 1. Preparation of acetylene black and conductive graphite mixed conductive agent (the first composite conductive paste)

[0104] The acetylene black and the conductive graphite were respectively cleaned with acetone, and dried in a vacuum drying oven. Add nano-aluminum powder and stir in the acetylene black after acetone cleaning and drying, obtain the acetylene black modified by nano-aluminum powder (the total mass of the acetylene black modified by nano-aluminum powder is 100%, the amount of the nano-aluminum powder mass percent is 5%).

[0105] Add the mixed acetylene black (i.e. the acetylene black modified by nano-aluminum powder) and conductive graphite into the NMP at a mass ratio of 1:1, wherein the solid content is 10-30%, and use a 700-800rpm high-speed mixer (dispersing disc ) dispersed for 2-3h, put into the g...

Embodiment 3

[0114] This embodiment provides a composite conductive agent, and the specific process for preparing the composite conductive agent is as follows:

[0115] 1. Preparation of acetylene black and conductive graphite mixed conductive agent (the first composite conductive paste)

[0116] The acetylene black and the conductive graphite were respectively cleaned with acetone, and dried in a vacuum drying oven. Add nano-aluminum powder and stir in the acetylene black after acetone cleaning and drying, obtain the acetylene black modified by nano-aluminum powder (the total mass of the acetylene black modified by nano-aluminum powder is 100%, the amount of the nano-aluminum powder The mass percentage is 3.5%).

[0117] Add the mixed acetylene black (i.e. acetylene black modified by nano-aluminum powder) and conductive graphite into NMP at a mass ratio of 1:0.5, wherein the solid content is 20%, and disperse for 3 hours with an 800rpm high-speed mixer (dispersing disc), Put it in the g...

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Abstract

The invention discloses a composite conductive agent, a preparation method thereof and the application of the composite conductive agent in a positive electrode slurry. The composite conductive agentis a composite conductive slurry, a solvent in the composite conductive slurry is an organic solvent, conductive particles include acetylene black, conductive graphite, nano carbon fibers, carbon nanotubes and graphene, the mass ratio of the acetylene black to conductive graphite is 1: (0.2 to 5), and the mass ratio of the nano carbon fibers to the carbon nanotubes to the graphene is 1: (0.2 to 5): (0.2 to 5). The composite conductive agent of the invention has a good point-to-surface omnidirectional conductive network, a larger contact point is formed by conductive particles in the compositeconductive agent and an active material, the electrical conductivity of an electrode sheet can be improved, the electrode sheet polarization and the battery internal resistance are reduced, and the battery performance is improved.

Description

technical field [0001] The invention relates to the technical field of preparation of a conductive agent for positive electrode materials, relates to a composite conductive agent, its preparation method and application, in particular to a composite conductive agent, its preparation method and its application in positive electrode slurry. Background technique [0002] Ternary cathode materials are mainly used in automotive power batteries. As the positive electrode material of lithium-ion batteries, it must be ensured that the electrode material is a good mixed conductor of ions and electrons, and a certain amount of conductive material is added to collect micro-current between active materials, active materials and current collectors. Reduce the contact resistance of the electrode, accelerate the movement rate of electrons, and effectively increase the migration rate of lithium ions in the electrode material, thereby improving the charge and discharge efficiency of the elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCY02E60/10
Inventor 姚淦黄明
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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