Conductive agent for lithium battery and preparation method thereof

Abstract

The invention discloses a conductive agent for a lithium battery and a preparation method thereof. The conductive agent for the lithium battery comprises the following components in percentage by weight: conductor particles, a dispersing agent, a binder and solvent; the conductor particles are carbon particles with carbon nanometer tubes growing on the surfaces. According to the conductive agent provided by the invention, the plurality of carbon nanometer tubes of the conductor particles are firmly connected with a carbon particle, so that the reliable long-range electrical conductivity is provided; the carbon nanometer tubes of the different conductor particles are connected with one another, and contact the active material, so that a conductive network can be constructed for the lithiumbattery; the conductive agent provided by the invention is beneficial to reducing the dosage, lowering internal resistance and temperature rise, and improving charging-discharging multiplying power and cycling performance. According to the conductive agent provided by the invention, the carbon nanometer tubes and the carbon particles form conductive particles of a whole composite structure, so that the steps for preparing the conductive agent only needs one time of dispersing and mixing, and thus the production technology is simplified.

Description

Technical field [0001] The invention belongs to the technical field of batteries, and specifically relates to a conductive agent for lithium batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, excellent cycle performance, and low self-discharge rate, and are widely used in neighborhoods such as energy storage, electric vehicles, and electronic products. The active materials of lithium-ion batteries are mostly transition metal oxides or transition metal salts, and most of them are semiconductors or insulators, which have poor conductivity, which limits the electron migration rate in the battery, restricts performance, and may cause performance degradation or failure. Therefore, a conductive agent must be added to improve the conductivity of the lithium-ion battery in order to increase the charge and discharge rate and cycle performance. [0003] Conductive agents for lithium-ion batteries includ...

AI Technical Summary

Problems solved by technology

This type of conductive agent is mixed according to a certain ratio. Whether it is carbon black and graphite, or carbon nanotubes, it is already difficult to disperse when used alone, and it is difficult to mix composite materials with each other and further mix with active substances. To ensure the good contact of the conductive agents of each component, the ideal conductive effect cannot be achieved, and the corresponding multiple dispersion and mixing also result in complex processes and increased costs

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