Electrolyte solution capable of improving over-charge safety performance of lithium battery
A technology of electrolyte solution and safety performance, applied in the field of materials, can solve the problems of reducing safety, battery internal pressure and temperature rise, and achieve the effects of improving anti-flat performance, improving overcharge resistance performance, and strong operability
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Embodiment 1
[0019] in an argon-filled glove box (H 2 O6 Soluble in a mixed solvent of EC / DMC / EMC (the volume ratio of the three is 1:1:1), in which LiPF 6 The final concentration is 1M; then the above-mentioned lithium-ion battery electrolyte is divided into two parts, one of which is a control sample without additives, and one is added with 3% of the total mass of the electrolyte 1-phenyl-1- The overcharge safe electrolyte of cyanocyclopentane, lithium-ion batteries were prepared with two kinds of electrolytes, and the overcharge performance was tested with 1C and 10V constant voltage. As a result, the battery without additives deformed, exploded, and caught fire, while the battery with additives Batteries do not explode and do not catch fire.
Embodiment 2
[0021] in an argon-filled glove box (H 2 O4 Soluble in a mixed solvent of EC / DMC / EMC (the volume ratio of the three is 1:1:1), in which LiBF 4 The final concentration is 1M, and then the above-mentioned lithium-ion battery electrolyte is divided into two parts, one of which is a control sample without additives, and one is added with 1.5% of the total mass of the electrolyte 1-phenyl-1-cyanide An overcharged safe electrolyte of cyclopentane was used to prepare a lithium-ion battery with two electrolytes, and the battery was charged to 4.2V at 0.2C, then discharged to 2.75V at 0.2C, and the thickness of the battery was tested. It was found that the battery without additive was deformed, and the battery with additive was not expanded and deformed.
Embodiment 3
[0023] in an argon-filled glove box (H 2 O6 Soluble in a mixed solvent of EC / DMC / EMC (the volume ratio of the three is 1:1:1), in which LiPF 6 The final concentration of D is 1M, and the type and amount of other functional additives D added are VC, 0.1mol / L. Then the above-mentioned lithium-ion battery electrolyte is divided into two parts, one of which is a comparison sample without adding an overcharge safety additive C, and one is an overcharge safety additive 2-phenyl-2 that accounts for 3% of the total mass of the electrolyte. -Cyano-perfluorinated overcharged safe electrolytes for propane were used to prepare lithium-ion batteries with two electrolytes, and the overcharged performance was tested with 1C and 10V constant voltage. The results showed that the batteries without overcharged safety additives were deformed, exploded, Fire, but the battery with overcharged safety additives does not explode and does not catch fire.
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