Electrolyte and lithium ion battery comprising same

Abstract

The invention provides an electrolyte and a lithium ion battery comprising the same. The electrolyte adopted by the invention comprises a non-aqueous organic solvent, an electrolyte lithium salt and an electrolyte functional additive, the electrolyte functional additive comprises a first additive and a second additive, the first additive is selected from at least one of organic germanium compounds, and the second additive is at least one of lithium salt compounds and/or at least one of cesium salt compounds. The first additive and the second additive are used as film-forming additives to form a compact SEI film dominated by inorganic matters such as an organic germanium compound, a lithium salt or a cesium salt and the like through reaction at the early stage of battery circulation, and the SEI film not only has the effect of inhibiting the subsequent electrolyte decomposition reaction, but also has the effect of inhibiting the electrolyte decomposition reaction; and the two-phase interface impedance of the electrode/electrolyte is further reduced, and conduction of lithium ions on a solid/liquid two-phase interface is promoted.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, and in particular relates to an electrolyte and a lithium ion battery including the electrolyte. Background technique [0002] The 2019 Nobel Prize in Chemistry was awarded to John B. Goodenough, M. Stanley Whittingham and Akira Yoshino for their outstanding contributions to the development of lithium-ion batteries, affirming the significance of lithium-ion batteries to the development of human society. In the past three decades, lithium-ion batteries have stood out among many chemical secondary power sources due to their advantages such as long cycle life and high energy density, and have gradually played an extremely important role in 3C electronic products, energy storage grids, electric vehicles and other fields. The role, known as one of the greatest inventions of the 20th century. [0003] With the further expansion of the application field, the performance requirements for lit...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem of poor cycle performance and discharge performance of lithium-ion batteries at low temperatures, by introducing at least one of organic germanium compounds and at least one of lithium salt compounds and/or at least one of cesium salt compounds As an electrolyte functional additive, the combination of the electrolyte

Images