Lithium ion battery non-aqueous electrolyte and lithium ion battery

Abstract

The invention belongs to the technical field of new energy, and particularly relates to a lithium ion battery non-aqueous electrolyte and a lithium ion battery. The non-aqueous electrolyte of the lithium ion battery comprises a non-aqueous organic solvent, a lithium salt and a spiro compound as shown in a structural formula 1, the compound as shown in the structural formula 1 has the characteristic that a sulfonate additive improves the high-temperature storage performance of the battery and also has the characteristic that a sulfate additive improves the high-temperature cycle performance of the battery, a passive film is deposited on the surface of a positive electrode, and the performance of the battery is improved. And the X functional group is further crosslinked, so that the coated passive film is more compact and stable, and the electrochemical performance of the electrode and the storage performance and self-discharge performance of the battery can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a non-aqueous electrolyte solution of a lithium ion battery and a lithium ion battery. Background technique [0002] In recent years, lithium-ion batteries have been widely used in various portable electronic communication devices due to their high operating voltage, no memory effect, long life, wide operating temperature range, and high safety. Under the background of the country's relevant new energy vehicle industry planning policies, lithium-ion batteries as the power source of new energy electric vehicles will usher in a period of explosive growth in demand. [0003] In non-aqueous electrolyte lithium-ion batteries, non-aqueous electrolyte, as the medium for lithium ion transport and current conduction between positive and negative electrodes, is a key factor determining battery performance. During the first charging process, the compound of the non-aqueous e...

AI Technical Summary

Problems solved by technology

However, after adding vinylene carbonate, the battery is prone to gas during high-temperature storage, causing the battery to bulge

Vinyl sulfite can also play a role, inhibit the decline of the initial capacity of the battery, increase the initial discharge capacity, reduce the expansion of the battery after being placed at high temperature, and improve the charge and discharge performance and cycle times of the battery. The SEI film has poor stability. As the number of cycles increases, the electrode interface resistance gradually increases, and the electronic polarization of the battery becomes more and more serious, resulting in a rapid decrease in the reversible capacity of the electrode.

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