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A kind of anti-overcharge lithium-ion battery electrolyte

A lithium-ion battery and electrolyte technology, applied in the field of electrochemistry, can solve problems such as damage to battery cycle performance, limit large-scale use, and low oxidation potential, so as to improve overcharge resistance and explosion-proof performance, low cost, and delay voltage Elevated effect

Active Publication Date: 2016-09-14
ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the lithium battery anti-overcharge electrolyte patent, two types (electropolymerization and redox type) anti-overcharge additives are mainly used to improve battery overcharge safety performance, such as biphenyl and cyclohexylbenzene, these two electropolymerization additives Although it can effectively inhibit the battery from overcharging, its addition will damage the cycle performance of the battery
However, redox additives such as ferrocene and its derivatives, anisole and its derivatives, although the overcharge protection mechanism is reversible, due to their low oxidation potential, oxidation occurs when they fail to reach the normal operating voltage of lithium-ion batteries of 4.2V. reduction reaction, which often limits its large-scale use in Li-ion batteries of different battery material systems

Method used

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  • A kind of anti-overcharge lithium-ion battery electrolyte
  • A kind of anti-overcharge lithium-ion battery electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In an argon glove box with a water content of less than 10ppm, prepare lithium-ion battery electrolyte: lithium salt LiPF 6 Soluble in a mixed solvent of EC / DMC / EMC (mass ratio 1:1:1), in which LiPF 6 The final concentration is 1mol / L; then add 4-methylphthalic anhydride accounting for 3% of the total mass of the electrolyte to the above electrolyte, and then use the electrolyte to prepare a lithium-ion battery. Use 3C, 10V first constant current and then constant voltage charging for overcharge test. Overcharge test curve such as figure 1 Middle 1 curve.

Embodiment 2

[0031] In an argon glove box with a moisture content of less than 10ppm, the lithium-ion battery electrolyte is prepared, and the lithium salt LiBF 4 Soluble in a mixed solvent of EC / DMC / EMC (mass ratio 1:1:1), in which LiBF 4 The final concentration is 1mol / L, then add 4-methylphthalic anhydride accounting for 1.5% of the total mass of the electrolyte to the above electrolyte, and then use the electrolyte to prepare a lithium-ion battery. Charge the battery to 4.2V at 1C at room temperature, and then discharge the battery to 2.75V at 1C to test the charge and discharge capacity and discharge efficiency of the battery. The charge-discharge curve results are as follows figure 2 Middle 1 curve.

Embodiment 3

[0036] 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, and the types and amounts of other additives are VC, 0.1mol / L. Then add 4,5-difluorophthalic anhydride accounting for 3% of the total mass of the electrolyte to the electrolyte, and then use the electrolyte to prepare a lithium ion battery. Use 3C, 10V first constant current and then constant voltage charging for overcharge test. Overcharge test curve such as figure 1 Middle 3 curves.

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PUM

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Abstract

The invention relates to an anti-overcharging lithium ion battery electrolyte. The lithium ion battery electrolyte comprises an organic solvent, a lithium salt and an additive, wherein the additive comprises an additive A; the mass of the additive A is 0.1-30% of the mass of the electrolyte; the concentration of the lithium salt is 0.1-2 mol / L; the structural formula of the additive A is as shown in the description; R1, R2, R3 and R4 are separately selected from any one of alkyl, alkoxyl, alkylene, halogenated alkyl, halogenated alkoxyl, halogenated alkylene, hydroxyl, carboxyl, an ether oxygen group and halogen; the halogen is F, Cl or Br; the halogenation is partial substitution or full substitution. The additive A is added to the electrolyte solution so as to effectively delay voltage rise when the battery is overcharged and greatly increase the overcharging resistance and the anti-explosion performance of the electrolyte solution.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to an electrolyte solution for preventing overcharge of a lithium-ion battery. Background technique [0002] Due to the significant advantages of high specific energy and high specific power, lithium-ion secondary batteries are considered to be the most promising power battery system. However, the thermal runaway accidents of power batteries in recent years have greatly affected consumers' confidence in accepting electric vehicles and hindered the development of the electric vehicle industry. Therefore, the safety issue is the biggest obstacle to the commercialization of large lithium-ion batteries. Among them, overcharging is one of the most dangerous factors that cause unsafe behavior of lithium-ion batteries. [0003] When the lithium-ion battery is overcharged, because the battery voltage rises rapidly with the increase of polarization, it will inevitably ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/056
CPCH01M10/0567H01M2300/0025Y02E60/10
Inventor 陈俊彩王峰秦虎袁翔云钱春峰吴钦
Owner ZHANGJIAGANG GUOTAI HUARONG NEW CHEM MATERIALS CO LTD
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