Electrolyte for lithium-ion battery and lithium-ion battery employing electrolyte

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of poor wettability, unsatisfactory performance in cycling and high-temperature storage, etc., and achieve improved high-temperature performance, excellent cycling and high temperature. Storage performance, the effect of improving wettability

Inactive Publication Date: 2016-07-06
DONGGUAN SHANSHAN BATTERY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the shortcomings of the current electrolyte in lithium-ion batteries with high voltage and high compaction density, its cycle and high temperature storage performance is not ideal, and its wetting performance is also relatively poor. One of the purp

Method used

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  • Electrolyte for lithium-ion battery and lithium-ion battery employing electrolyte
  • Electrolyte for lithium-ion battery and lithium-ion battery employing electrolyte
  • Electrolyte for lithium-ion battery and lithium-ion battery employing electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Electrolyte preparation:

[0031] In a glove box filled with argon (moisture content 6 , then add methyl 2-thiophenecarboxylate with a mass fraction of 5%, stir until completely dissolved, and obtain the lithium-ion battery electrolyte of Example 1.

[0032] Preparation of lithium-ion batteries:

[0033]After the positive electrode active material lithium cobaltate, the conductive agent acetylene black, and the binder polyvinylidene fluoride (PVDF) are fully stirred and mixed in the N-methylpyrrolidone solvent system at a mass ratio of 95:3:2, they are coated on Dry and cold press on Al foil to obtain the positive electrode sheet, the compacted density is 4.0g / cm 3 .

[0034] Negative electrode active material graphite, conductive agent acetylene black, binder styrene-butadiene rubber (SBR), thickener carbon methyl cellulose sodium (CMC) are in the deionized water solvent system according to the mass ratio of 95:2:2:1 After fully stirring and mixing evenly, it is coa...

Embodiment 2

[0038] Different from Example 1 is the preparation of electrolyte:

[0039] In a glove box filled with argon (moisture content 6 , then adding mass fraction of 3% fluoroethylene carbonate, mass fraction of 1% adiponitrile and mass fraction of 0.5% methyl 2-thiophenecarboxylate, stirred until completely dissolved, namely to obtain the lithium of Example 2 Ion battery electrolyte.

[0040] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0042] Different from Example 1 is the preparation of electrolyte:

[0043] In a glove box filled with argon (moisture content 6 , then adding mass fraction of 3% fluoroethylene carbonate, mass fraction of 1% adiponitrile and mass fraction of 5% methyl 2-thiophenecarboxylate, stirred until completely dissolved, namely to obtain the lithium of Example 3 Ion battery electrolyte.

[0044] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention relates to the technical field of lithium-ion batteries, in particular to a high-voltage and high-compaction electrolyte for a lithium-ion battery and the lithium-ion battery employing the electrolyte. The electrolyte comprises a lithium salt, a non-aqueous organic solvent and an additive, wherein the additive comprises fluoroethylene carbonate, a nitrile compound and a compound with a structure shown in the formula I; R1, R2 and R3 in the formula I are independently selected from hydrogen, halogen, hydroxyl, amino, a sulfo group, nitryl, carboxyl, an aldehyde group and alkyl or alkoxy of which the carbon atom number is 1-3 respectively; R4 is selected from hydrogen, amino or alkyl of which the carbon atom number is 1-3; and n is selected from an arbitrary integer between 0 and 2. Compared with the prior art, the battery employing the electrolyte is excellent in infiltration effect and high in development capacity under the conditions of high voltage and high compaction and has excellent cycle performance and high-temperature storage performance through synergistic effects of the fluoroethylene carbonate, the nitrile compound and the compound with the structure shown in the formula I.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-voltage and high-pressure lithium-ion battery electrolyte and a lithium-ion battery using the electrolyte. Background technique [0002] Since it was successfully commercialized by Sony Corporation in 1991, lithium-ion batteries have been quickly used in mobile phones, notebook computers, cameras, tablet computers and other electronic product markets. The advantages of long life, no memory effect, and low self-discharge rate gradually take the leading position. In addition, it is also used as a power supply module in drones, electric bicycles, electric balance cars, electric vehicles and other fields. However, with the continuous development of the corresponding application fields, the energy density of the current power supply module can no longer match the corresponding power consumption module, so how to improve the energy density of lithium-ion batteries...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525C07D333/38C07D333/24
CPCC07D333/24C07D333/38H01M10/0525H01M10/0567Y02E60/10
Inventor 李志强周文超谭熠伟
Owner DONGGUAN SHANSHAN BATTERY MATERIALS
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