A kind of lithium-ion battery non-aqueous electrolytic solution and lithium-ion battery comprising the electrolytic solution

Abstract

The invention discloses a lithium-ion battery non-aqueous electrolyte and a lithium-ion battery containing the electrolyte. The electrolyte contains a non-aqueous organic solvent, an electrolyte lithium salt, a conventional additive and a functional additive. The functional additive is Soluble silicon-containing organolithium salt. After adding the additive to the electrolyte, the battery can form an SEI film with excellent mechanical properties at the interface of the silicon negative electrode material during the formation stage, which can alleviate the rupture of the silicon negative electrode particles due to volume expansion during the charging process, thereby improving the cycle performance of the battery and storage performance.

Description

[technical field] [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery non-aqueous electrolyte and a lithium ion battery. [Background technique] [0002] With the rapid development of new energy technologies all over the world, more and more electrochemical energy storage devices have gradually appeared in people's daily life, and the products involve mobile phones, cameras, laptop computers, and power vehicles. Among these electrochemical devices, rechargeable lithium-ion batteries have gained unanimous praise due to their high energy density. In recent years, the demand for lithium-ion batteries with high energy density has gradually increased. Non-carbon negative electrode active materials such as silicon-based negative electrode active materials have been widely used to improve battery capacity, among which SiO active materials have been studied more. Although the energy density of a single lith...

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Problems solved by technology

[0004] Aiming at the problem that the existing silicon-based negative electrode lithium-ion battery has poor cycle performance and storage performance under high temperature environment, the present invention provides a non-aqueous electrolyte solution for lithium-ion battery, which effectively solves the problem of silicon-based negative electrode lithium-ion battery Easy expansion under high temperature conditions leads to the problem of decreased battery cycle performance, storage performance and safety performance. On the other hand, a lithium-ion battery using the non-aqueous electrolyte is provided

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