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A kind of high voltage electrolytic solution containing cyclopentene dinitrile and lithium ion battery using the electrolytic solution

A cyclopentenedinitrile and electrolyte technology, applied in the field of lithium ion batteries, can solve the problems of film formation, weak adsorption, destruction of graphite layered structure, etc., achieve good film formation performance, good interface compatibility, improve Effect of cycle performance and high temperature performance

Active Publication Date: 2018-08-17
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, saturated fatty nitrile cannot form a film on the surface of the electrode. It is mainly physically adsorbed on the surface of the positive electrode to complex metal ions through the action of an electric field.

Method used

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  • A kind of high voltage electrolytic solution containing cyclopentene dinitrile and lithium ion battery using the electrolytic solution
  • A kind of high voltage electrolytic solution containing cyclopentene dinitrile and lithium ion battery using the electrolytic solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Electrolyte solution preparation steps: In a glove box filled with argon, mix ethylene carbonate, diethyl carbonate, and ethyl methyl carbonate according to the mass ratio of EC:DEC:EMC=1:1:1, and then add to the mixed solution Slowly add lithium hexafluorophosphate and 0.1mol / L lithium bisfluorosulfonyl imide at a concentration of 1.0mol / L, and finally add 3wt% fluoroethylene carbonate and 0.5wt% 3-cyclopentene-1 based on the total weight of the electrolyte, 1-diacetonitrile, 3wt% 1,3-propane sultone were stirred evenly to obtain the lithium ion battery electrolyte of Example 1.

[0025] Inject the lithium-ion battery electrolyte prepared in the above steps into the fully dried 4.40V graphite / LiCoO 2 In the polymer battery, the battery is subjected to 3.0V ~ 4.40V 1C cycle charge and discharge test and 4.40V full charge state 85°C / 6H storage test after the battery is left at 45°C for 24h, formed, fixture high-temperature baking, secondary sealing and conventional capac...

Embodiment 2～8

[0032] In Examples 2-8, except that the content of each component of the electrolyte is added as shown in Table 1, the others are the same as in Example 1. Table 1 is the content table of each component of the electrolyte and battery performance test results of Examples 1-8:

[0033] Table 1:

[0034]

[0035] In the above Table 1, the abbreviated names of each chemical substance are as follows:

[0036] EC (ethylene carbonate), DEC (diethyl carbonate), EMC (ethyl methyl carbonate), PP (n-propyl propionate), LiFSI (lithium bisfluorosulfonyl imide), LiTFSI (bistrifluoromethanesulfonyl Lithium imide), FEC (fluoroethylene carbonate), PS (1,3-propane sultone), DTD (ethylene sulfate).

[0037] In summary, the present invention forms a film on the surface of the positive and negative electrodes of the battery through the synergistic effect of fluoroethylene carbonate and cyclopentene dinitrile with good film-forming properties, improves the electrode / electrolyte interface compa...

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Abstract

The invention discloses a high-voltage electrolyte containing cyclopentene dinitrile and a lithium-ion battery employing the electrolyte. The high-voltage electrolyte is characterized by comprising an electrolyte lithium salt, a non-aqueous organic solvent and an additive, wherein the additive comprises fluoroethylene carbonate and a cyclopentene dinitrile compound; a nitrile functional group -CN in the cyclopentene dinitrile compound and transition metal ions in a positive active material can generate complexation; catalytic decomposition of the electrolyte is reduced; dissolution of the metal ions is inhibited; and the crystal structure of the high-voltage positive active material is stabilized, so that the cycle performance and the high-temperature performance of the high-voltage battery are improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a high-voltage electrolyte containing cyclopentene dinitrile and a lithium ion battery using the electrolyte. Background technique [0002] With the increasing awareness of environmental protection, the use of traditional primary batteries such as lead-acid batteries and nickel-metal hydride batteries is increasingly limited. Lithium-ion batteries have the advantages of high voltage, large specific energy, environmental protection and no memory effect, and are widely used in digital, military, energy storage and power fields. In order to meet the miniaturization and multi-function development of portable mobile electronic devices, end consumers have higher and higher energy density requirements for lithium-ion secondary batteries. [0003] At present, in order to increase the energy density of lithium-ion batteries, it is mainly through selecting high-capacity, high-pressure...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 吕家斌仰永军万华平胡巍粟彬刘利文
Owner GUANGZHOU TINCI MATERIALS TECH
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