Method for reducing self-discharge rate of high-nickel ternary lithium battery

Abstract

The invention discloses a method for reducing self-discharge rate of a high-nickel ternary lithium battery. The method comprises the steps of (a) adding barium hydroxide and sodium hydroxide into deionized water to prepare a mixed solution; (b) dropping titanium titanium tetrachloride into the mixed solution, transferring the mixture solution to a polytetrafluoroethylene lining, and performing hydrothermal reaction; (c) performing thermal processing after hydrothermal reaction is ended to prepare barium titanate; and (d) mixing the barium titanate, metal lithium, lanthanum oxide, yttrium oxide, bismuth oxide, antimony oxide, tantalum oxide and niobium oxide, and coating the mixture onto a negative current collector by flame, thereby reducing the self-discharge rate of the high-nickel ternary lithium battery. The method has the following beneficial effects that the barium titanate is flame-coated onto a surface of the current collector to form semiconduction ceramic, metal ions can be absorbed, the loss of electrode metal is prevented to a certain extent, and the self-discharge effect is further reduced.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a solution to the self-discharge problem, and in particular to a method for reducing the self-discharge rate of a high-nickel ternary lithium battery. Background technique [0002] Lithium-ion batteries are a new generation of secondary batteries developed rapidly in the 1990s, and are widely used in small portable electronic communication products and electric vehicles. The manufacture of battery materials is the core link in the lithium battery industry. Battery materials are divided into positive electrode materials, negative electrode materials, separators, electrolytes, etc. Cathode material is one of the key materials in the manufacture of lithium-ion batteries, accounting for more than 25% of the battery cost, its performance directly affects the various performance indicators of the battery, and occupies a core position in lithium-ion batteries. At present, the anode ma...

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Problems solved by technology

[0008] It can be seen that the inconsistency of the battery pack due to self-discharge of the high-nickel ternary lithium battery in the prior art greatly affects the capacity and safety, especially the self-discharge of metal impurities, which causes the aperture of the diaphragm to be blocked, and even pierces the diaphragm. Seriously endanger the safety of the battery, and the existing methods mainly prevent the electrode from reacting with the electrolyte, passivate aluminum, and cannot effectively reduce the self-discharge rate of the lithium battery.

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