Lithium ion battery and electrolyte thereof

A lithium-ion battery and electrolyte technology, which is applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of battery flammable electrolyte leakage, battery equipment damage, battery damage, etc., and achieve small expansion of battery thickness, The effect of reducing gas generation and good stability

Active Publication Date: 2012-10-17
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will not only cause damage to the battery itself, but also damage to the equipment using the battery. In severe cases, a short circuit may occur inside the battery due to expansion and deformation of the battery, or the flammable electrolyte may leak due to the rupture of the battery packaging bag, which may cause a fire. Risk of Security Incidents

Method used

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  • Lithium ion battery and electrolyte thereof
  • Lithium ion battery and electrolyte thereof
  • Lithium ion battery and electrolyte thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Electrolyte preparation:

[0035] Ethylene carbonate (EC), propylene carbonate (PC), and diethyl carbonate (DEC) were mixed in a mass ratio of 40:40:20 to obtain a non-aqueous solvent, and lithium hexafluorophosphate (LiPF 6 ) is dissolved in the above-mentioned non-aqueous solvent as a lithium salt to obtain a basic electrolyte. Then add 2-butenenitrile as an additive to the basic electrolyte, so that the mass of 2-butenenitrile accounts for 3 wt% of the total mass of the electrolyte.

[0036] Preparation of lithium-ion batteries:

[0037] The positive electrode active material LiNi 0.5 co 0.2 mn 0.3 o 2 (LNCM), conductive agent acetylene black, and binder polyvinylidene fluoride (PVDF) were mixed in N-methylpyrrolidone solvent system at a mass ratio of 96:2:2, and then coated on Al foil and baked. Dry and cold press to obtain the positive electrode sheet.

[0038]Negative electrode active material artificial graphite, conductive agent acetylene black, binder st...

Embodiment 2

[0042] Different from Example 1, the non-aqueous solvent of the electrolyte is a mixture of dimethyl carbonate (DMC), diethyl carbonate (DEC) and ethylene carbonate (EC), and the mass ratio of the three is 40:40 : 20, the additive is 4-n-dodecyl-3-butenenitrile, and the quality of 4-n-dodecyl-3-butenenitrile accounts for 0.1wt% of the total mass of the electrolyte.

[0043] The positive active material is lithium cobalt oxide (LiCoO 2 ); the negative electrode active material is a mixture of natural graphite and hard carbon, and the mass ratio of the two is 85:15 respectively.

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

Embodiment 3

[0046] Different from Example 1, the non-aqueous solvent of the electrolyte is a mixture of ethyl methyl carbonate (EMC), gamma-butyrolactone and vinylene carbonate (VC), and the mass ratio of the three is 80:10: 10. The additive is 3-methyl-3-butenenitrile, and the mass of 3-methyl-3-butenenitrile accounts for 0.5wt% of the total mass of the electrolyte.

[0047] The positive active material is lithium cobalt oxide (LiCoO 2 ) and lithium nickelate (LiNiO 2 ), the mass ratio of the two is 90:10; the negative electrode active material is a mixture of artificial graphite and soft carbon, and the mass ratio of the two is 70:30.

[0048] The rest are the same as in Embodiment 1, and will not be repeated here.

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PUM

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Abstract

The invention, belonging to the technical field of lithium ion battery, particularly relates to a lithium ion battery electrolyte capable of improving the high temperature storage performance of a lithium ion battery, comprising a non-aqueous solvent, lithium salts dissolved in the non-aqueous solvent, and an additive which is a compound of formula (I), wherein R1, R2, and R3 are selected from hydrogen atom, alkyl containing 1-12 carbon atoms, cycloalkyl containing 3-8 carbon atoms, and aryl containing 6-12 carbon atoms, and n is an integer in the range of 0-7. The compound can effectively passivate the anode and cathode surfaces, prevent oxygenolysis of the electrolyte ingredients on the anode surface and prevent reductive decomposition on the cathode surface, thus gas generation of the battery is reduced, and the high temperature storage performance of the lithium ion battery is raised. In addition, the invention further discloses a lithium ion battery containing the electrolyte.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a lithium-ion battery electrolyte capable of improving the high-temperature storage performance of the lithium-ion battery and a secondary battery using the electrolyte. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high working voltage, long cycle life, no memory effect, and environmental friendliness. Also mature. [0003] With the continuous development of lithium battery technology, people hope that lithium-ion batteries can have higher energy density. In order to improve the energy density of lithium-ion batteries, there are currently two main trends: one is that some positive electrode materials with high nickel content, such as lithium nickel cobalt aluminum oxide, lithium nickel cobalt manganese oxide with high nickel content, are developed for lithium Ion batteries; the second is to increase th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 任建勋付成华赵丰刚
Owner NINGDE AMPEREX TECH
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