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Electrolyte for lithium secondary battery and lithium secondary battery including same

A lithium secondary battery and electrolyte technology, which is applied in secondary batteries, lithium batteries, organic electrolytes, etc., can solve the problems of poor high-temperature cycle performance and storage stability, and achieve high-temperature cycle performance, reduce interface impedance, and discharge The effect of performance improvement

Inactive Publication Date: 2021-01-15
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of poor high-temperature cycle performance and poor storage stability of existing lithium secondary batteries under high voltage, the present invention provides an electrolyte solution for lithium secondary batteries and a lithium secondary battery comprising the electrolyte solution. Specifically, the present invention The following technical solutions are provided:

Method used

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  • Electrolyte for lithium secondary battery and lithium secondary battery including same
  • Electrolyte for lithium secondary battery and lithium secondary battery including same
  • Electrolyte for lithium secondary battery and lithium secondary battery including same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) Preparation of positive electrode sheet

[0058] The cathode active material LiCoO 2 , the binder polyvinylidene fluoride (PVDF), and the conductive agent acetylene black are mixed according to the weight ratio of 96.5:2:1.5, N-methylpyrrolidone (NMP) is added, and stirred under the action of a vacuum mixer until the mixed system becomes a uniform flow positive electrode slurry; apply the positive electrode slurry evenly on aluminum foil with a thickness of 9-12 μm; bake the above-mentioned coated aluminum foil in 5 ovens with different temperature gradients, and then put it in an oven at 120 ° C Dry for 8 hours, and then roll and cut to obtain the required positive electrode sheet.

[0059] (2) Preparation of graphite negative electrode sheet

[0060] 95.9% graphite negative electrode material, 1.1% conductive carbon black (SP) conductive agent, 1% carboxymethyl cellulose sodium (CMC) dispersant and 1% mass proportion 2% styrene-butadiene rubber (SBR) binder is ...

Embodiment 2-9 and comparative example 1-7

[0068] Others are the same as in Example 1, the difference is that the step (3) is different, and the specific selection and addition of the organic solvent, lithium salt and the second additive in the additive are shown in Table 1.

[0069] The composition of the electrolytic solution of table 1 embodiment 1-9 and comparative example 1-7

[0070]

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Abstract

The invention relates to the technical field of lithium secondary batteries, and in particular relates to an electrolyte for a lithium secondary battery and the lithium secondary battery including theelectrolyte. The electrolyte provided by the invention is prepared by adding a first additive containing hexamethyldisilazane and 1, 2, 2, 3-propane tetracarbonitrile, and a second additive containing one or more of fluoroethylene carbonate, 1, 3-propane sultone, vinylene carbonate, vinylene carbonate, ethylene sulfate or ethylene sulfite. The high-temperature cycle performance, the storage stability performance and the low-temperature discharge performance of the lithium secondary battery under high voltage can be improved; the lithium secondary battery provided by the invention comprises the electrolyte, so that the lithium secondary battery has good high-temperature cycle performance, storage stability and low-temperature discharge performance under high voltage.

Description

technical field [0001] The invention relates to the technical field of lithium secondary batteries, in particular to an electrolyte solution for a lithium secondary battery and a lithium secondary battery comprising the electrolyte solution. Background technique [0002] Lithium secondary batteries are widely used in modern life, such as mobile phones, laptops, bracelets, Bluetooth headsets, electric vehicles and energy storage power stations. However, as people use the above-mentioned products more frequently, the performance requirements for lithium secondary batteries are also getting higher and higher. [0003] The electrolyte solution for lithium secondary batteries is mainly composed of organic solvents, lithium salts and additives. In order to increase the energy density of lithium secondary batteries, the upper line voltage of lithium secondary batteries is gradually increased. Unfortunately, the electrolyte solution for lithium secondary batteries is easily decomp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/052H01M10/0587
CPCH01M10/052H01M10/0567H01M10/0587H01M2300/0025Y02E60/10Y02P70/50
Inventor 廖波王海李素丽
Owner ZHUHAI COSMX BATTERY CO LTD
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