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Lithium ion battery electrolyte and secondary battery containing lithium ion battery electrolyte

A lithium-ion battery and electrolyte technology, applied in the field of electrochemistry, can solve problems such as safety, capacity, and cycle performance attenuation, and achieve the effects of improving charge/discharge cycle performance, widening the electrochemical window, and increasing battery capacity

Inactive Publication Date: 2014-04-09
JIANGXI YOULI NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The requirements of the future market for batteries are: high energy density, long-term power supply; good cycle performance, long service life; wide electrochemical window, the difference in temperature between north and south, winter and summer, requires the battery to be able to operate at higher and lower temperatures It can work normally in the environment without the problems of safety, capacity and cycle performance greatly attenuated

Method used

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  • Lithium ion battery electrolyte and secondary battery containing lithium ion battery electrolyte

Examples

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preparation example Construction

[0031] Preparation method of battery:

[0032] Positive electrode preparation: mix according to the positive electrode formula above, and then disperse in N-methyl-2-pyrrolidone to prepare a slurry. The slurry is coated on a thin aluminum foil and dried to make a positive electrode sheet.

[0033] Negative electrode preparation: mix according to the above-mentioned negative electrode formula, and then disperse in N-methyl-2-pyrrolidone to prepare a slurry. The slurry is coated on a thin copper foil and dried to make a negative electrode sheet.

[0034] Electrolyte preparation: According to the above electrolyte formula, under the protection of argon, prepare the electrolyte according to the above ratio in a glove box, and strictly control the influence of moisture and other substances.

[0035] The positive electrode sheet, negative electrode sheet and electrolyte of the lithium ion battery prepared above were manufactured by a conventional method to manufacture a model 5234...

Embodiment 1

[0037] Except that the electrolyte composition is inconsistent with the comparative example, its implementation steps are the same as those described in the comparative example.

[0038] Electrolyte composition: The electrolyte contains organic solvents, lithium salts and functional additives. The components of the organic solvent and additives and their mass percentages are: the organic solvent is ethylene carbonate (EC): dimethyl carbonate (DMC): ethylmethyl carbonate (EMC) (mass ratio 1:1:1), Lithium salt is LiPF 6 Mix it with LiODFB in a ratio of 10:1.2, the concentration of the substance in the electrolyte is 1 mol / L, then add 3% 1,3-propene sultone of the total weight of the electrolyte to the solution, the electrolyte 1% of the total weight of vinylene carbonate, add p-fluorotoluene according to 10% of the total weight of the electrolyte, add fluoroalkylsulfonic acid according to 0.15% of the total weight of the electrolyte, and add hexamethasone according to 0.5% of t...

Embodiment 2

[0041] Except that the electrolyte composition is inconsistent with the comparative example, its implementation steps are the same as those described in the comparative example.

[0042] Electrolyte composition: The electrolyte contains organic solvents, lithium salts and functional additives. The components of the organic solvent and additives and their mass percentages are: the organic solvent is ethylene carbonate (EC): dimethyl carbonate (DMC): ethylmethyl carbonate (EMC) (mass ratio 1:1:1), Lithium salt is LiPF 6Mix it with LiODFB at a ratio of 10:1.2, and the concentration of its substance in the electrolyte is 1 mol / L, then add 1% vinyl sulfite of the total weight of the electrolyte to the solution, and 1.5% of the total weight of the electrolyte Vinyl vinylene carbonate, add 2-fluorotoluene according to 5% of the total weight of the electrolyte, add fluoroalkylsulfonic acid according to 0.15% of the total weight of the electrolyte, add toluenesulfonic acid according t...

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Abstract

The invention provides a lithium ion battery electrolyte and a secondary battery containing the lithium ion battery electrolyte, and relates to the technical field of electrochemistry. The lithium ion battery electrolyte contains a lithium salt, an organic solvent, 0.5-5% by weight of a film-forming additive, 1-15% by weight of a fluorobenzene compound, 0.01-0.5% of a wetting agent, and 0.01-2% of a stabilizer. The lithium ion secondary battery comprises a positive electrode material, a negative electrode material and an electrolyte, wherein the positive electrode material comprises, by mass, 85% of LiCoO2, 7.5% of polyvinylidene fluoride (PVDF) and 7.5% of conductive carbon black SP, and the negative electrode material comprises, by mass, 90% of high compactness graphite, 7% of polyvinylidene fluoride (PVDF) and 3% of conductive carbon black SP. According to the present invention, the battery capacity can be increased, the charge / discharge cycle performance can be improved, and the electrochemical window can be widened.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to an electrolyte solution for a lithium ion battery and a secondary battery containing the electrolyte solution. Background technique [0002] With the shortage of oil and other resources and the deterioration of the environment, lithium-ion secondary batteries have become one of the new green energy sources, and have been widely used in electronic equipment, mobile communication equipment, transportation equipment and other fields. [0003] The performance of lithium-ion batteries is greatly affected by the performance of the positive electrode, negative electrode, and electrolyte. The positive active material is mainly lithium cobalt oxide (LiCoO 2 ), lithium manganate (LiMn 2 o 4 ), ternary, etc., reversibly deintercalate lithium ions with the electrolyte, showing a high reversible electrode potential. The negative electrode active material is mainly selected from c...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/0525H01M10/058
CPCY02E60/122H01M10/0525H01M10/0567Y02E60/10Y02P70/50
Inventor 李雪铖王超颜果春齐爱
Owner JIANGXI YOULI NEW MATERIALS
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