Lithium ion battery non-aqueous electrolyte and lithium ion battery

Abstract

The invention provides a lithium ion battery non-aqueous electrolyte and a lithium ion battery; the lithium ion battery non-aqueous electrolyte comprises an electrolyte, a non-aqueous organic solventand an additive, and the additive comprises a mixture containing a compound A, a compound B, vinylene carbonate and 1, 3-propane sultone. The compound A and the compound B in the non-aqueous electrolyte of the lithium ion battery play a synergistic role, so that the interface impedance of the lithium battery is effectively reduced, the high-temperature and low-temperature properties of the lithiumbattery are improved, and meanwhile, the thermal stability of the electrolyte is considered.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a nonaqueous electrolyte solution for lithium ion batteries and the lithium ion battery. Background technique [0002] At present, the electrolyte used in the existing industrial manufacturing of lithium-ion batteries is mainly LiPF 6 、LiBF 4 、LiCLO 4 , LiI, etc., the electrolyte concentration is 0.1-2.0mol / L, and EC-PC-DMC-DEC-EMC (where EC is ethylene carbonate, PC is propylene carbonate, DMC is dimethyl carbonate, DEC is diethyl carbonate , EMC is ethyl methyl carbonate) and other organic substances are solvents. [0003] The electrolyte has a great influence on the performance of lithium batteries, mainly because the composition, concentration, viscosity, and conductivity of the electrolyte are related to the electrode surface reaction. The conductivity of the electrolyte and the reversibility of the electrode reaction directly affect the discharge capacity of...

AI Technical Summary

Problems solved by technology

However, it has been found through research that the interface passivation film formed by additives containing phosphate groups is relatively thick, and the battery impedance is relatively large, resulting in poor low-temperature performance.

[0005] The high-nickel ternary lithium-ion battery electrolyte is currently unable to take into account the high and low temperature performance of the lithium battery. The interface impedance is high and the thermal stability of the electrolyte is poor, so it is easy to decompose at high temperature to produce HF, corrode the interface and diaphragm, and produce colored substances.

Images