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Electrolyte of lithium ion battery and lithium ion battery utilizing same

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of poor battery performance at high temperature, and achieve the effect of reducing expansion rate, improving storage, and good high-temperature storage performance

Active Publication Date: 2015-03-25
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high-temperature performance of the battery usually deteriorates, which cannot ultimately solve the problem of lithium-ion batteries in applications

Method used

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  • Electrolyte of lithium ion battery and lithium ion battery utilizing same
  • Electrolyte of lithium ion battery and lithium ion battery utilizing same
  • Electrolyte of lithium ion battery and lithium ion battery utilizing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1 Electrolyte L1 # ~L13 # preparation of

[0043] The preparation steps of the electrolytic solution are: mixing dimethyl carbonate, ethylene carbonate and propylene carbonate in a mass ratio of 1:1:1 as an organic solvent. Add additives to the organic solvent, mix well, then add LiPF 6 , to get LiPF 6 The mixed solution with a concentration of 1 mol / L is the electrolyte.

[0044] The relationship between the number of the obtained electrolyte and the composition of the electrolyte additive is shown in Table 1.

Embodiment 2

[0050] Example 2 Battery C1 # ~C13 # 、DC1 # ~DC5 # production

[0051] Production of the positive electrode sheet:

[0052] The positive electrode active material lithium cobaltate (molecular formula is LiCoO 2), the conductive agent acetylene black, and the binder polyvinylidene fluoride (abbreviated as PVDF) are fully stirred and mixed in N-methylpyrrolidone (abbreviated as NMP) solvent at a weight ratio of 96:2:2 to form a uniform Positive slurry. The slurry was coated on the positive electrode current collector Al foil, dried and cold pressed to obtain the positive electrode sheet.

[0053] Production of negative electrode sheet:

[0054] Negative electrode active material graphite, conductive agent acetylene black, binder styrene-butadiene rubber (abbreviated as SBR), thickener sodium carboxymethyl cellulose (abbreviated as CMC) in an appropriate amount according to the weight ratio of 95:2:2:1 Fully stir and mix in the deionized water solvent to form a uniform an...

Embodiment 3

[0059] Example 3 Battery C1 # ~C13 # 、DC1 # ~DC5 # High temperature storage performance test

[0060] For battery C1 # ~C13 # 、DC1 # ~DC5 # The storage performance test at 60°C was carried out. Among them, the specific operation of the high temperature storage test is: put the battery C1 # ~C13 # 、DC1 # ~DC5 # , charged to 4.5V at a rate of 0.5C, charged at a constant voltage of 4.5V to a current of 0.025C, and then discharged to 3.0V at a rate of 0.5C. The discharge capacity was recorded as the discharge capacity of the battery before storage. After that, charge to 4.5V with a constant current of 0.5C rate, and then charge at a constant voltage of 4.5V to a current of 0.025C, so that it is fully charged at 4.5V, and test the thickness and internal resistance of the battery before storage; then, put the fully charged battery Put them into a 60°C incubator, store them for 20 days and 35 days respectively, and take them out to measure the thickness and internal resis...

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PUM

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Abstract

The invention discloses electrolyte of a lithium ion battery. The electrolyte comprises an organic solvent, electrolyte lithium salt and additives, wherein the additives include butanedinitrile, fluorobenzene and lithium tetrafluoroborate; the mass percentage of the fluorobenzene in the electrolyte is 0.1 to 15 percent; the mass percentage of the butanedinitrile in the electrolyte is 0.1 to 10 percent; the mass percentage of the lithium tetrafluoroborate in the electrolyte is 0.01 to 1 percent. By adopting the electrolyte, while the charging upper limit voltage and high temperature intermittent cycling performance of the lithium ion battery are improved, simultaneously the expansion rate of the battery is reduced, the internal resistance is reduced, and the stability and the safety of the lithium ion battery can be improved.

Description

technical field [0001] The application belongs to the field of batteries, and in particular relates to a non-aqueous electrolyte and a lithium ion battery using the electrolyte. Background technique [0002] Lithium-ion batteries have significant advantages such as high specific energy, high specific power, long cycle life, and small self-discharge. They have been widely used in electronic products such as mobile communications, digital cameras, and video cameras, and have become a hot spot in the development of energy storage and power batteries. . With the wide application of lithium-ion batteries, higher requirements are put forward for their environmental adaptability, and lithium-ion batteries have been used in various environments. For example, in severe cold areas with harsh environments, lithium-ion batteries are required to work normally at extremely low temperatures. However, the charge and discharge performance of lithium-ion batteries in low temperature environ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0034H01M10/4235H01M2300/0025Y02E60/10
Inventor 龙兵
Owner DONGGUAN AMPEREX TECH
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