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Electrolyte and lithium ion battery using same

An electrolyte and lithium salt technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve difficult problems such as high voltage performance and flame retardancy of electrolytes, achieve good cycle performance and improve safety Performance, flammability reduction effect

Active Publication Date: 2015-12-02
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to take into account the high voltage performance and flame retardancy of the electrolyte at the same time with a single addition method

Method used

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  • Electrolyte and lithium ion battery using same
  • Electrolyte and lithium ion battery using same
  • Electrolyte and lithium ion battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Electrolyte preparation: Prepare 1mol / LLiPF according to EC: PC: DEC: EMC: VC: PS = 35: 5: 35: 25: 2: 2.5 (volume ratio) 6 Electrolyte solution, and then add 1,4 phosphomethyl-2,3 methylcycloalkenyl ester with a weight percent content of 2%.

[0025] (2) Preparation of positive electrode material: LiNi mixed with 91% by weight 0.5 mn 1.5 o 2 (positive active material), the SP (superconducting carbon black) of 4% by weight and the PVDF (binder) of 5% by weight, and add N-methylpyrrolidone to it and make slurry, will The slurry is coated on an aluminum foil, and rolled after drying to obtain the positive electrode material.

[0026] (3) Preparation of negative electrode material: mixing artificial graphite of 75% by weight, mesophase carbon microspheres of 20% by weight, sodium carboxymethyl cellulose of 5% by weight, and adding deionized water, and then coating the slurry on a copper foil, drying and rolling to obtain the negative electrode material.

[0027] (4...

Embodiment 2

[0030] (1) Electrolyte preparation: Prepare 1mol / LLiPF according to EC: PC: DEC: EMC: VC: PS = 35: 5: 35: 25: 2: 2.5 (volume ratio) 6 The electrolytic solution is then added with 2.5% by weight of 1,4-phosphonomethyl-2,3-methylcycloalkenyl ester.

[0031] (2) Preparation of positive electrode material: mixing 72wt% LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 and 18 wt% LiMn 0.8 Fe 0.2 o 4 (positive electrode active material), the SP (superconducting carbon black) of weight percentage 5% and the PVDF (bonding agent) of weight percentage 5%, and to it, add N-methylpyrrolidone and make slurry, will The slurry is coated on an aluminum foil, and rolled after drying to obtain the positive electrode material.

[0032] (3) Preparation of negative electrode material: mixing artificial graphite of 75% by weight, mesophase carbon microspheres of 20% by weight, sodium carboxymethyl cellulose of 5% by weight, and adding deionized water, and then coating the slurry on a copper foil, drying and rolli...

Embodiment 3

[0036] (1) Configure the reference electrolyte to prepare 1mol / LLiPF according to EC: PC: DEC: EMC: VC: PS = 35: 5: 35: 25: 2: 2.5 (volume ratio) 6 electrolyte, and then 1,4 phosphomethyl-2,3 methylcycloenyl ester was added to the reference electrolyte at different concentrations (1%, 5%, 10%, 15%, 20%, 25%, 30%, 40%), mixed evenly, and the above operations were all completed in an argon glove box.

[0037](2) Use the self-extinguishing time method to test the flame retardancy of the above-mentioned electrolytes containing different concentrations of 1,4-phosphomethyl-2,3 methylcycloenyl ester, and record the test results as follows image 3 It can be obtained that as the content of 1,4-phosphomethyl-2,-methylcycloenyl ester increases, the self-extinguishing time of the electrolyte becomes shorter, and when it is added to 25% or more, the electrolyte is completely non-flammable.

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Abstract

The invention relates to an electrolyte. The electrolyte comprises lithium salt, nonaqueous solvent and an additive; the additive is cycloalkene represented in the general formula (I) or the general formula (II), wherein R1 represents one of an alkyl phosphate group, a fluorinated phosphate group and a phosphazene group, R2 represents an alkyl group with the carbon number of 1-12, or an alkoxy carbanyl group with the carbon number of 1-12, or an alkyl sulfonyl group with the carbon number of 1-12 or an alkenyl group with the carbon number of 1-12, and all hydrogen atoms in the R2 substituent group are replaced by halogen atoms. When the electrolyte is used for manufacturing a lithium ion battery, stable interface films can be formed on the surfaces of the positive electrode and the negative electrode, so that reaction activity of the surfaces of the electrodes is restrained, oxygenolysis of the electrolyte is reduced, gas expansion is effectively restrained, then the safety performance and the cycling performance under high voltage particularly the high-temperature cycling performance of the lithium ion battery are improved, and the service life of the lithium ion battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of chemical power sources, in particular to a non-aqueous electrolyte solution for a lithium ion battery capable of taking into account battery cycle performance and flame retardancy, and a lithium ion battery using the electrolyte solution. Background technique [0002] Compared with traditional secondary batteries, lithium-ion batteries have the advantages of high working voltage, small size, light weight, high energy density, no memory effect, no pollution, small self-discharge, and long cycle life. In 1990, Sony Corporation of Japan produced the first lithium-ion battery, setting off a wave of commercialization of lithium-ion batteries. In recent years, in addition to being used in consumer electronics, lithium-ion secondary batteries are also widely used in electric vehicles, and are regarded as an important means to solve vehicle exhaust pollution and reduce fossil energy consumption. At present, one ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 卫友亮梁大宇包婷婷
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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