Negative electrode slurry, negative electrode plate as well as preparation methods and applications thereof

Abstract

The invention relates to a negative electrode slurry, a negative electrode plate, and preparation methods and applications of the negative electrode slurry and the negative electrode plate. The negative electrode slurry comprises a negative electrode active substance, a binder, a conductive agent, weak acid, alcohol and a solvent. The mass fraction of the negative active material is 40-45%, the mass fraction of the binder is 1.2-3%, the mass fraction of the conductive agent is 1.5-3%, the mass fraction of the weak acid is 0.1-0.2%, the mass fraction of the alcohol is 0.2-0.3% and the mass fraction of the solvent is 45-60% in terms of 100% of the total mass of the negative slurry. The negative electrode slurry provided by the invention has the characteristics of high dispersity and compatibility and high bonding strength, the surface of a negative electrode plate prepared from the negative electrode slurry is uniformly dispersed, the peeling force is high and can reach 0.1 N or above, the surface resistance of a film sheet is relatively low and is 0.0000181 Ohm / mm < 2 > or below, and the requirements of the industrial Internet of Things can be met.

Description

technical field [0001] The invention relates to the technical field of hybrid capacitors, in particular to a negative electrode slurry, a negative electrode sheet, a preparation method and application thereof. Background technique [0002] With the development of chemical power supply technology, supercapacitors have been successfully applied in consumer electronics, energy transportation, power compensation and other fields, and their market size is expanding rapidly. With the rapid growth of electric vehicles, the steady advancement of smart grids, and the rapid development of the Industrial Internet of Things, higher requirements are placed on the energy density and wide temperature performance of supercapacitors, especially the general requirements of industrial Internet of Things power supplies that can meet the wide temperature Large current discharge with a certain energy density, such as -50 ~ 125 ℃ discharge, the energy density is 10-80Wh / kg. Therefore, it is neces...

AI Technical Summary

Problems solved by technology

The negative electrode slurry, through the improvement of the traditional negative electrode formula, uses weak acid and alcohol to make it have the characteristics of good dispersibility, compatibility and high bonding strength. The problem of uneven dispersion of the film and low peeling force, the hybrid capacitor prepared by the negative electrode has low internal resistance and excellent rate performance

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