Additive used for lithium ion battery electrolyte and electrolyte and lithium ion battery

Abstract

The invention relates to the field of lithium ion batteries, and discloses an additive used for a lithium ion battery electrolyte and the electrolyte and the lithium ion battery, wherein the additivecontains an additive a, an additive b and an additive c; the structural formula of the additive a is as shown in structural formula 1; the additive b is at least one of lithium difluorophosphate, lithium difluoroborate and lithium difluorosulfonimide; the additive c is at least one of vinylene carbonate, 1, 3-propane sultone, fluoroethylene carbonate, vinyl vinyl carbonate, glycol sulfite, vinylidene sulfate, propylene sulfite, dimethyl sulfate and trimethylene Sulfite. The additive is mixed by several mixtures, and is applied to the lithium ion battery electrolyte; the electrolyte has excellent overcharge performance, and is excellent in flame retardant property; furthermore, the lithium ion battery using the electrolyte has very small internal resistance and K value, and has relatively good normal temperature circulating performance and high temperature storage property.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an additive for the electrolyte solution of the lithium ion battery, the electrolyte solution and the lithium ion battery. Background technique [0002] Lithium-ion batteries have been widely used in portable devices, electric vehicles, energy storage and other fields. However, the most important issue restricting the further development of lithium-ion batteries is the safety of the batteries themselves. Tesla electric car batteries caught fire, Samsung mobile phones exploded, etc. Accidents constantly remind us that safety is a prerequisite for batteries. Especially in the future, lithium batteries will develop in the direction of high energy density and high power, and safety issues cannot be ignored. [0003] The current method to ensure battery safety is divided into internal and external protection mechanisms. External protection relies on electronic devices, w...

AI Technical Summary

Problems solved by technology

However, the addition of existing overcharge and flame retardant additives will increase the internal resistance and K value of the battery, thereby reducing the cycle and high and low temperature performance of the battery, which undoubtedly has a negative impact on the electrical performance of the battery, especially in When the use of flame retardant and overcharge additives increases, most of the existing technologies only consider increasing the safety of the battery, but at the expense of the electrical performance of the battery

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