About the introduction of safe lithium iron phosphate battery electrolyte

Source: 2020 - 04 - 11 against hits: safety of lithium iron phosphate battery electrolyte of lithium battery electrolyte often use lithium iron phosphate salt dissolved solute and solute nonaqueous solvents, has the very good prevent overcharge safety, long service life, such as electrolyte containing ingredients are: alkyl, aromatic compounds containing methoxyl stable resistance to overload additives, additives and film forming additive lithium salt, among them, the resistance of the oppression of the additive content is 0. 01 ~ 20 w t %; Stable additives content is 0. 001 ~ 10W。 T %。 Film forming additive dosage is 0. 5 ~ 10W。 T %。 The content of the organic solvent is 50 ~ 90 w. T %。 The total concentrations of lithium is 0. 7 ~ 1. 5M。 Non-aqueous system of organic electrolyte low flash point of flammable characteristics, it in stoke temperature sealing of the power system is very simple, very active electrode materials in the process of charging and discharging will produce a series of the catalytic exothermic reaction, leading to thermal runaway and side effects between electrolyte and electrode material with gas, but the battery exposed to air, sufficient oxygen immediately under the high temperature inside the battery air has the complete combustion of organic electrolyte, eventually led to the explosion of the battery. Therefore, choosing the right is the electrolyte for lithium ion secondary battery of high energy density, long cycle life and the key to good security. Results show that adding lithium salt stabilizer has weak alkaline, can interact with PF5, hold the cause side effects. It can inhibit the dissolution of anode and loss, cause capacity attenuation, thus improve the retention capacity of the battery. Described in the film forming additive has high reduction potential, can improve the capacity of the battery capacity and cycle life. To sum up, in the iron phosphate lithium ion secondary battery using the electrolyte as the anode, can overcome the shortcomings of the lithium iron phosphate batteries at present, to improve the compatibility of electrolyte with the positive and negative material, compatibility and security. It has good resistance to overcharge safety and longer cycle life.