Lithium ion battery positive active substance, anode material, anode material sizing agent, anode piece, preparation method and lithium ion battery

Abstract

The invention discloses a lithium ion battery positive active substance, an anode material, an anode material sizing agent, an anode piece, a preparation method thereof and a lithium ion battery, which relates to the technical field of lithium ion batteries. The lithium ion battery positive active substance is mainly prepared from the following components by weight percent: 10 to 50 percent of lithium manganese ferrous phosphate and 50 to 90 percent of nickel cobalt lithium manganate, wherein the lithium manganese ferrous phosphate is LiMn*Fe1-*PO4, x is greater than 0.5 and less than 1; and the nickel cobalt lithium manganate is Li(Ni*CoyMnz)O2, x is greater than 0 and less than 1, y is greater than 0 and less than 1, and z is greater than 0 and less than 1. The lithium ion battery positive active substance solves the problems of excessively high temperature and safety of the traditional lithium battery at multiplying power. By improving an anode material and an anode piece, not only can the heat stability of the anode material be improved, but also the internal resistance of the pole piece can be reduced, the application to the high power can be satisfied, and the safety is good.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a positive electrode active material of a lithium ion battery, a positive electrode material, a positive electrode material slurry, a positive electrode sheet, a preparation method thereof, and a lithium ion battery. Background technique [0002] Although the electric vehicle industry has developed rapidly in recent years, there are still major hidden dangers behind it. The biggest problem is the safety of lithium-ion batteries. There are many factors that affect the safety of lithium-ion batteries. The most direct two factors are material heat Stability and temperature rise during use lead to heat accumulation, especially under high rate (power) charge and discharge, the temperature rise increases exponentially. [0003] Based on national policies and market (consumer) needs, in order to ensure the endurance of electric vehicles, major battery factories are current...

AI Technical Summary

Problems solved by technology

However, the safety problem of ternary lithium-ion batteries has not been completely resolved, especially the ternary lithium-ion batteries with high nickel content.

However, due to the problem of contact between the metal aluminum foil and the powder, its conductive effect is not good

Some battery manufacturers apply conductive carbon black coating on aluminum foil to improve contact effect and increase conductivity, but limited by the characteristics of conductive carbon black itself, this process is still limited in improving conductivity and reducing internal resistance

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