Ternary high-nickel electrolyte and high-nickel anode lithium ion battery containing same

Abstract

The invention provides ternary high-nickel electrolyte and a high-nickel anode lithium ion battery containing the electrolyte. The ternary high-nickel electrolyte is characterized by comprising, by weight, 13-15% of lithium salt, 80-85% of a non-aqueous organic solvent and 0.1-5% of an additive; wherein the additive comprises vinylene sulfate, vinylene carbonate, succinonitrile, tris (trimethyl silicon-based) phosphorus, lithium bifluroflavin imide and lithium dioxalate borate; the lithium salt is lithium hexafluorophosphate; the non-aqueous organic solvent comprises a cyclic carbonate compound, dimethyl carbonate and ethoxy pentafluoro tripolyphosphate; the high-nickel anode lithium ion battery containing the ternary high-nickel electrolyte adopts anode slurry prepared from high-nickel ternary anode powder, a conductive agent, a functional composite binder, a solvent N-methyl pyrrolidone to prepare the anode membrane, the high-nickel anode lithium ion battery has excellent normal-temperature cycle performance, high-temperature cycle performance and high-temperature storage service life, and can obviously reduce the gas yield in the high-temperature storage process.

Description

technical field [0001] The invention belongs to the field of new energy storage, and relates to a long-cycle ternary material system electrolyte and a lithium-ion battery preparation technology, in particular to a ternary high-nickel electrolyte and a high-nickel cathode lithium-ion battery containing the electrolyte. Background technique [0002] At present, the market prospect of power lithium-ion batteries for electric vehicles is broad, and ternary power batteries with high energy density are increasingly recognized by various car manufacturers and battery manufacturers, and the demand is large; The direction of high nickel is developing, that is, the Ni content in the ternary materials used is continuously increasing. The common high nickel ternary materials include NCM811, NCA and so on. [0003] In fact, the high-nickel ternary material battery manufacturers are prone to the problem of sticky slurry jelly during the manufacturing process, which is caused by the produc...

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Problems solved by technology

[0006] The problem to be solved by the present invention is a series of problems such as the positive electrode slurry jelly cycle caused by the production process of the existing high-nickel ternary material battery, the deterioration of the performance of the battery cell caused by the strong oxidation of the high-nickel positive electrode material, and the deterioration of the electrochemical performance of the battery. The invention provides a ternary high-nickel electrolyte and a high-nickel positive lithium ion battery containing the electrolyte, and the high-nickel positive lithium-ion battery containing the ternary high-nickel electrolyte has excellent normal temperature cycle performance, high temperature cycle performance and high temperature storage life, and can significantly reduce gas production during high temperature storage

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