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Lithium ion battery electrolyte and preparation method thereof, and lithium ion battery

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of battery energy density decrease, inactive material increase, process realization difficulties, etc., to suppress decomposition reaction and improve charge and discharge rate, the effect of fast charge and discharge rate

Inactive Publication Date: 2016-04-13
EVE HYPERPOWER BATTERIES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, by adding nano-conductive agents such as carbon fibers to the positive and negative electrodes to reduce the internal resistance of lithium-ion batteries and improve the fast charging and fast-discharging performance of the battery, however, the cost of such nano-conductive materials is very high, and the addition of nano-conductive agents It is difficult to achieve the uniformity of the slurry in the process of batching the positive and negative electrodes
Another example is to reduce the thickness of the positive and negative electrodes and increase the porosity of the electrodes by reducing the coating surface density and compaction density of the positive and negative electrodes, so as to reduce the migration and diffusion path of lithium ions and increase the density of the electrolyte. reserve capacity, thereby improving the fast charging capability of lithium-ion batteries, but this will lead to an increase in inactive materials and a significant decrease in the energy density of the battery

Method used

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  • Lithium ion battery electrolyte and preparation method thereof, and lithium ion battery
  • Lithium ion battery electrolyte and preparation method thereof, and lithium ion battery
  • Lithium ion battery electrolyte and preparation method thereof, and lithium ion battery

Examples

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preparation example Construction

[0032] Such as figure 1 As shown, the preparation method of the above-mentioned lithium-ion battery electrolyte of an embodiment comprises the following steps:

[0033] S110: The mass ratio is 25-35:30-50:25-35, after uniformly mixing the cyclic ester, the chain carbonate and the chain carboxylate to obtain a first mixed solution.

[0034] S120: after the mass ratio is 12.5-14.5:80-120, the lithium hexafluorophosphate and the first mixed liquid are uniformly mixed to obtain the second mixed liquid.

[0035] S130: Mix the vinylene carbonate, the fluoroethylene carbonate and the second mixed solution according to the mass ratio of 1-2:2-4:92.5-134.5 to obtain an electrolyte solution for the lithium-ion battery.

[0036] As another example, after mixing the cyclic ester, chain carbonate and chain carboxylate, let it stand at room temperature for half an hour. In another example, after mixing the lithium hexafluorophosphate and the first mixed solution, they were left to stand a...

Embodiment 1

[0054] In a glove box filled with inert gas argon (moisture content<10PPM, oxygen content<10PPM), 25g ethylene carbonate, 25g propyl acetate, 20g methyl ethyl carbonate, 20g diethyl carbonate and 10g propylene carbonate were used Stir with a magnetic stirrer for 20 minutes, then slowly add 12.5g of lithium hexafluorophosphate, continue to stir with a magnetic stirrer for 20 minutes, finally, add 4g of fluoroethylene carbonate and 1g of vinylene carbonate, and then stir with a magnetic stirrer for 20 minutes to obtain a lithium ion battery electrolyte.

[0055] Provide lithium cobalt oxide powder material with a median particle size of 12 μm, artificial graphite powder material with a median particle size of 18 μm, aluminum foil, copper foil, separator, aluminum-plastic packaging film, positive aluminum tab and negative nickel tab. The lithium cobaltate powder material with a median particle size of 12 μm is coated on an aluminum foil, rolled, and cut to obtain a positive elect...

Embodiment 2

[0057] In a glove box filled with inert gas argon (moisture content<10PPM, oxygen content<10PPM), 20g ethylene carbonate, 20g propyl acetate, 10g ethyl acetate, 40g methyl ethyl carbonate and 10g gamma-butyrolactone were used Stir with a magnetic stirrer for 20 minutes, then slowly add 13.5g of lithium hexafluorophosphate, continue to stir with a magnetic stirrer for 20 minutes, finally, add 3g of fluoroethylene carbonate and 1.5g of vinylene carbonate, and then stir with a magnetic stirrer for 20 minutes to obtain lithium ion battery electrolyte.

[0058] Provide lithium cobalt oxide powder material with a median particle size of 13 μm, artificial graphite powder material with a median particle size of 20 μm, aluminum foil, copper foil, separator, aluminum-plastic packaging film, positive aluminum tab and negative nickel tab. The lithium cobalt oxide powder material with a median particle size of 13 μm is coated on an aluminum foil, rolled, and cut to obtain a positive electr...

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Abstract

The invention relates to a lithium ion battery electrolyte, which comprises, by mass, 25-35 parts of a cyclic ester, 30-50 parts of a chain carbonate, 25-35 parts of chain carboxylic acid ester, 12.5-14.5 parts of lithium hexafluorophosphate, 1-2 parts of vinylene carbonate, and 2-4 parts of fluoroethylene carbonate. According to the present invention, with the application of the lithium ion battery electrolyte in the lithium ion battery, vinylene carbonate and fluoroethylene carbonate can form the SEI film with characteristics of high density and stable structure on the electrode material, such that the adsorption of the lithium ions migrating between the positive electrode and the negative electrode on the electrode material surface during the charging and discharging process can be avoided to increase the concentration of the migrating lithium ions so as to improve the number of the charges moving between the positive electrode and the negative electrode within the per unit time of charge and discharge so as to improve the charging and discharging rate of the lithium ion battery. The present invention further discloses a preparation method of the lithium ion battery electrolyte, and a lithium ion battery using the lithium ion battery electrolyte.

Description

technical field [0001] The invention relates to a lithium-ion battery electrolyte, in particular to a lithium-ion battery electrolyte, a preparation method thereof, and a lithium-ion battery. Background technique [0002] Lithium-ion batteries have great advantages and markets in the digital product market due to their high energy density, low self-discharge rate and long cycle life. The current electronic products such as smart phones and tablet computers consume much more power than previous digital electronic products due to the increase in usage functions. Therefore, current digital electronic products such as smart phones and tablet computers need to recharge lithium-ion batteries frequently. , to ensure the normal use of digital electronic products. [0003] Generally speaking, the standard charge and discharge C rate of lithium-ion batteries is 0.2C to 0.5C, that is, it takes 2 hours to 5 hours to fully charge once, which will seriously restrict the effective frequen...

Claims

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Application Information

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IPC IPC(8): H01M10/0566H01M10/0525
CPCY02E60/10
Inventor 佟健
Owner EVE HYPERPOWER BATTERIES INC
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