Electrolyte of lithium ion battery

Abstract

The invention belongs to the technical field of lithium ion batteries, particularly relates to electrolyte of the lithium ion batteries, and by weight, is composed of 13.5-18.5% of electrolyte, 66.5-78.5% of solvent and 8-15% of annexing agent. The solvent is composed of at least three of ethylene carbonate (EC), ethyl acetate (EA), propyl acetate (EP), dimethyl carbonate (DMC), methyl ethyl carbonate (EMC) and diethyl carbonate (DEC), the annexing agent is composed of at least three of vinylene carbonate (VC), 1,3 propane suhone (PS), difluoro oxalic acid lithium borate (LIODFB), propylene carbonate (PC), polyoxy diethyl ether and fluoro ethylene ester (FEC), and the electrolyte is lithium hexafluorophate (LiPF6). The electrolyte still has excellent performance at low temperature, and lithium ion batteries made of the electrolyte are excellent in low temperature discharge performance.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to an electrolyte solution of a lithium ion battery. Background technique [0002] Since lithium polymer batteries have a series of advantages over traditional lead-acid batteries (Lead-Acid Battery) and Ni-MH batteries (Ni-MH Battery), they have a series of advantages such as high energy density, long service life, no memory effect, and no pollution. With the development of lithium battery technology, lithium polymer batteries will gradually replace traditional batteries and be used in various fields. At present, with the increasing attention to the environment and the damage to the environment by the existing automobile industry, it is imperative to find an alternative to petroleum as power. With the national eleventh and twelfth five-year plans Implementation, in terms of new energy vehicles, lithium polymer batteries will become the first choice to replace petroleum...

AI Technical Summary

Problems solved by technology

At present, with the increasing attention to the environment and the damage to the environment by the existing automobile industry, it is imperative to find an alternative to petroleum as power. With the national eleventh and twelfth five-year plans Implementation, in terms of new energy vehicles, lithium polymer batteries will become the first choice to replace petroleum; however, according to the current technology of lithium batteries, it is difficult to work at low temperatures, which means that it is difficult to use lithium batteries in northern latitudes and severe cold regions. power car

At present, lithium batteries can only discharge about 80% at most in an environment of minus 20 degrees. This is only the capacity retention rate. If converted into energy retention rate, this value will be even smaller, only less than 60% at room temperature. It is difficult to normally apply lithium batteries to power vehicles

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