Electrolyte for lithium-ion batteries, lithium-ion batteries, battery modules, battery packs, and devices

Abstract

An electrolyte solution for a lithium ion battery, a lithium ion battery, a battery module, a battery pack and a device. The electrolyte solution includes an organic solvent, an electrolyte lithium salt dissolved in the organic solvent, and an additive, wherein the additive is a compound shown in the following formula I. The electrolyte can inhibit the growth of lithium dendrites in the lithium ion battery, improve the cycle performance of the battery, and at the same time improve the flame retardancy of the battery, effectively solving the defects in the prior art.

Description

Electrolytes for Li-ion batteries, Li-ion batteries, battery modules, battery packs and device technical field The application relates to battery field, relate in particular to a kind of electrolyte for lithium ion battery, lithium ion battery, battery Modules, battery packs and devices. Background technique [0002] At present, lithium-ion batteries have been widely used in high-tech products such as automobiles and mobile phones. commercial lithium-ion battery To use graphite as the negative electrode material, its capacity is close to the theoretical value of graphite (372mAh / g). processing and greatly increase the capacity of lithium-ion batteries. The theoretical specific capacity of metal lithium is as high as 3860mAh / g, and the electrode potential is low. to ‑3.04V (vs.H 2 / H + ), so the development of lithium-ion batteries with lithium metal as the negative electrode has once again caused the concern of researchers. Note. However, the obstacles ...

AI Technical Summary

Problems solved by technology

[0003] However, the obstacles that limit the further development of lithium-ion batteries mainly include the following three aspects: 1) lithium-ion batteries are prone to generate lithium dendrites during cycling, which leads to short circuits in the battery; 2) lithium dendrites have large surface area, high activity, and are prone to Reacts violently with the electrolyte to produce flammable gases such as hydrogen, alkanes, and olefins; 3) During the lithium deposition / dissolution process, the volume changes greatly, resulting in continuous rupture and reorganization of the SEI film on the surface of lithium metal, consuming electrolyte and active lithium

The above behaviors will lead to the reduction of lithium-ion battery cycle efficiency, shortened battery cycle life and potential safety hazards.

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