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Lithium ion battery electrolyte and lithium ion battery using same

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of high-temperature storage and poor cycle performance, and achieve the effects of excellent cycle performance, excellent capacity, and excellent fast charging performance

Inactive Publication Date: 2016-08-10
DONGGUAN SHANSHAN BATTERY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] One of the purposes of the present invention is to provide a battery that not only has excellent wetting effect, excellent fast charging performance, but also has good cycle performance in view of the shortcomings of high-temperature storage and poor cycle performance of the electrolyte used in current fast-charge lithium-ion batteries. Lithium-ion battery electrolyte with high temperature storage performance

Method used

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  • Lithium ion battery electrolyte and lithium ion battery using same
  • Lithium ion battery electrolyte and lithium ion battery using same
  • Lithium ion battery electrolyte and lithium ion battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Electrolyte preparation:

[0034]In a glove box filled with argon (moisture content 6 , then add 3% fluoroethylene carbonate in mass fraction, 1% adiponitrile in mass fraction and 0.5% 2,6-dipyridinedicarboxamide in mass fraction, and stir until completely dissolved to obtain Example 1 Lithium-ion battery electrolyte.

[0035] Preparation of lithium-ion batteries:

[0036] After the positive electrode active material lithium cobaltate, the conductive agent Super P, 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 .

[0037] Negative electrode active material graphite, conductive agent Super P, binder styrene-butadiene rubber (SBR), thickener carbon methyl cellulose sodium (CMC) were mixed in a deionized water solvent system according to the mass ratio o...

Embodiment 2

[0041] Different from Example 1 is the preparation of electrolyte:

[0042] In a glove box filled with argon (moisture content 6 , then add 3% fluoroethylene carbonate, 1% adiponitrile and 3% 2,6-dipyridinedicarboxamide by mass fraction, and stir until completely dissolved to obtain Example 2 lithium-ion battery electrolyte.

[0043] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0045] Different from Example 1 is the preparation of electrolyte:

[0046] In a glove box filled with argon (moisture content 6 , then add mass fraction of 3% fluoroethylene carbonate, mass fraction of 1% adiponitrile and mass fraction of 0.5% 2-pyridine carboxamide, stir until completely dissolved, namely obtain the lithium ion of Example 3 battery electrolyte.

[0047] 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 lithium ion battery electrolyte and a lithium ion battery using same; the electrolyte is prepared from lithium salt, a non-aqueous organic solvent and an additive, wherein the additive is prepared from fluoroethylene carbonate, nitrile compounds and a compound with a structure as shown in formula I; R1, R2, R3, R4 and R5 in the formula I are separately selected from hydrogen, an amide group and alkyl or alkoxy with a carbon number being 1-3; R1, R2, R3, R4 and R5 at least contain one amide group. Compared with the prior art, the lithium ion battery electrolyte is excellent in wetting effect and excellent in fast charge performance under a high-voltage condition by virtue of a synergistic effect generated by the fluoroethylene carbonate, the nitrile compounds and an amide pyridine compound with a structure as shown in formula I; moreover, the lithium ion battery electrolyte has the comprehensive performance of a long cycle life and a low high-temperature storage expansion rate.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a high-voltage fast-charging lithium-ion battery electrolyte and a lithium-ion battery using the electrolyte. Background technique [0002] Since its commercialization in 1991, lithium-ion batteries have rapidly been widely used in consumer and power terminals due to their advantages such as high capacity density, high working voltage, low pollution in the manufacturing process, and clean and pollution-free use process. From primary lithium metal batteries to secondary rechargeable lithium-ion batteries such as cylinders, aluminum shells, and soft packs, lithium batteries are also showing an increasingly diverse product pattern, and highly customized, controllable shapes, and wide performance are gradually becoming a reality. . [0003] Although in emerging consumer fields such as mobile phones and tablet computers that have emerged in recent years, lithium-ion bat...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0042Y02E60/10
Inventor 李志强周文超黄晓丹谭熠伟
Owner DONGGUAN SHANSHAN BATTERY MATERIALS
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