Lithium iron phosphate battery for lithium-ion battery electrolyte for ultra-low temperature charging and discharging

Abstract

The invention relates to a lithium iron phosphate battery with lithium ion battery electrolyte suitable for ultralow-temperature charging and discharging. The lithium ion battery electrolyte comprises lithium salt, a multi-element organic solvent and additives, wherein the additives comprise a low-melting-point additive, a film forming additive and a high-temperature additive; the multi-element organic solvent contains at least three of ethylene carbonate, diethyl carbonate, dimethyl carbonate, methyl ethyl carbonate, propylene carbonate and butylene carbonate; the low-melting-point additive contains at least one of 4-methyl-1,3-dioxolane, methyl acetate, methyl propionate, methyl butyrate, ethyl butyrate, propyl butyrate and butyl acetate; the high-temperature additive is at least one of methyl ester, di-n-propyl carbonate and 1,3-propane sultone. The lithium iron phosphate battery with the electrolyte can charge and discharge at an ultralow temperature and in a high-temperature environment, and is stable in performance and long in recycling life.

Description

technical field [0001] The invention relates to an electrolyte solution of a lithium ion battery and a lithium iron phosphate battery thereof, in particular to an electrolyte lithium iron phosphate battery capable of ultra-low temperature charge and discharge while taking into account high temperature performance. Background technique [0002] At present, the positive electrode of commercial lithium iron phosphate batteries uses lithium iron phosphate materials, and the negative electrode uses carbon materials, such as graphite, mesocarbon microspheres (MCMB), etc., and the electrolyte generally uses non-aqueous organic solvents dissolved in lithium salts. As an important part of the battery, the electrolyte plays the role of transporting lithium ions and conducting current between the positive and negative electrodes. The organic solvents widely used in lithium-ion battery electrolytes are as follows: diethyl carbonate (DEC), dimethyl carbonate (DMC), ethyl methyl carbonate...

AI Technical Summary

Problems solved by technology

[0005] To sum up, there is currently no lithium iron phosphate battery capable of ultra-low temperature discharge, low temperature charge, and high temperature charge and discharge, with stable performance and excellent cycle performance, which limits the application field of lithium iron phosphate batteries

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