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High-temperature high-voltage safety lithium ion battery electrolyte and lithium ion battery

A lithium ion battery, high temperature and high pressure technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of flammable electrolyte leakage, damage to lithium ion batteries, battery packaging rupture, etc. rate, the effect of reducing viscosity

Inactive Publication Date: 2019-05-14
SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will not only damage the lithium-ion battery, but also damage the battery equipment, and even cause a short circuit inside the battery or rupture of the battery packaging, leakage of flammable electrolyte, and fire

Method used

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  • High-temperature high-voltage safety lithium ion battery electrolyte and lithium ion battery
  • High-temperature high-voltage safety lithium ion battery electrolyte and lithium ion battery
  • High-temperature high-voltage safety lithium ion battery electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In a glove box filled with argon, with an oxygen content of ≤1ppm and a water content of ≤1ppm, uniformly mix ethylene carbonate, ethyl methyl carbonate, and adiponitrile at a mass ratio of 3:5:2, and add to the mixture Add 5% of the total mass of the electrolyte fluoroethylene carbonate (FEC) and 3% of the total mass of the electrolyte vinyl sulfate (DTD), 5% of the total mass of the electrolyte tris (2,2,2-trifluoroethyl ) phosphite (TFEP), the pentafluorophenyl isocyanate (PFPI) of 0.5% of the total mass of the electrolytic solution, then add the lithium hexafluorophosphate of 14% of the total mass of the electrolytic solution to the mixed solution, stir to make it dissolve completely, and obtain the solution of Example 1 electrolyte.

Embodiment 2

[0028] In a glove box filled with argon, with an oxygen content of ≤1ppm and a water content of ≤1ppm, uniformly mix ethylene carbonate, ethyl methyl carbonate, and adiponitrile at a mass ratio of 3:5:2, and add to the mixture Add 5% of the total mass of the electrolyte FEC and 3% of the total mass of the electrolyte DTD, 5% of the total mass of the electrolyte TFEP, 1% of the total mass of the electrolyte PFPI, and then add 14% of the total mass of the electrolyte to the mixed solution LiPF 6 , stirred to make it dissolve completely, and the electrolyte solution of Example 2 was obtained.

Embodiment 3

[0030] In a glove box filled with argon, with an oxygen content of ≤1ppm and a water content of ≤1ppm, uniformly mix ethylene carbonate, ethyl methyl carbonate, and adiponitrile at a mass ratio of 3:5:2, and add to the mixture Add 5% FEC of the total mass of the electrolyte and 3% DTD of the total mass of the electrolyte, 5% of the TFEP of the total mass of the electrolyte, and 2% of the PFPI of the total mass of the electrolyte, and then add 14% of the total mass of the electrolyte to the mixed solution LiPF 6 , and stirred to make it dissolve completely, and the electrolyte solution of Example 3 was obtained.

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Abstract

The invention relates to the technical field of lithium ion batteries, and particularly discloses a high-temperature high-voltage safety lithium ion battery electrolyte and a lithium ion battery. Thelithium ion battery electrolyte comprises a lithium salt, a non-aqueous organic solvent and an additive, wherein the additive includes an isocyanate additive, a film forming additive and a fluorinatedflame-retardant additive. According to the lithium ion battery electrolyte, by adding the first type of the isocyanate additive and the second type of the film forming additive, a stable SEI film canbe formed on the surface of an electrode material, so that the ion conduction can be facilitated, and the decomposition of the electrolyte can be inhibited; and by adding the third type of the fluorinated flame-retardant additive, F atoms can form a film on an electrode interface, so that the intermolecular force can be reduced, the viscosity of the electrolyte can be reduced, and the conductivity of the electrolyte can be improved. All the components cooperate, so that the battery has good high-temperature storage performance, normal temperature cycling performance and high-temperature cycling performance under a high voltage, and does not have potential safety hazards.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high temperature and high pressure safe lithium ion battery electrolyte and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high discharge voltage, long cycle life, and easy maintenance. They have firmly occupied most of the market share in mobile electronic equipment and other fields. Lithium-ion batteries with improved safety and power performance are also ideal power sources for future electric vehicles (EV), hybrid electric vehicles (HEV) and military equipment. [0003] However, the electrolyte is generally composed of high-purity organic solvents, electrolyte lithium salts, and necessary additives. Under high temperature conditions, the reactivity of the positive and negative electrodes of the lithium-ion secondary battery is further enhanced, resulting in a reaction between the positive...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0566H01M10/0567
CPCY02E60/10
Inventor 郭洁朱学全大浦靖何建辉
Owner SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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