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Lithium ion battery electrolyte and lithium ion secondary battery

A lithium-ion battery and electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, electrolytes, etc., can solve the problems of poor cycle performance and storage performance, and achieve excellent cycle performance and storage performance

Inactive Publication Date: 2020-01-10
FARASIS TECH (GANZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the defects of poor cycle performance and storage performance under high pressure and high temperature in the lithium ion battery in the prior art

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] (1) Preparation of positive electrode sheet for lithium ion battery

[0086] The positive electrode active material nickel cobalt manganese lithium LiNi 0.5 co 0.2 mn 0.3 o 2 , conductive agent SP, and binder polyvinylidene fluoride PVDF are dissolved in the solvent N-methylpyrrolidone at a mass ratio of 96:2:2 and mixed evenly to make a positive electrode slurry, and then the positive electrode slurry is evenly coated on the current collector On aluminum foil, the coating amount is 0.040g / cm 2 , followed by drying at 120°C, cold pressing, cutting, slitting, and punching, and then drying at 85°C for 4 hours under vacuum conditions, welding the tabs, and making a positive electrode sheet of a lithium-ion battery that meets the requirements.

[0087] (2) Preparation of lithium-ion battery negative electrode sheet

[0088] Negative electrode active material artificial graphite, conductive agent SP, thickener sodium carboxymethyl cellulose CMC, binder styrene-butadiene...

Embodiment 2-18

[0095] Adopt the same method as Example 1 to prepare lithium-ion battery positive pole, negative pole, electrolyte and lithium-ion battery, the difference is in the preparation of step (3) lithium-ion battery electrolyte, the silyl cyano sultone used The structures or contents of the compounds are different, as shown in Table 1.

Embodiment 19

[0097] Adopt the same method as Example 3 to prepare lithium ion battery positive pole, negative pole, electrolyte and lithium ion battery, the difference is in the preparation of step (3) lithium ion battery electrolyte, the silyl cyano sultone used The content of the compound is different. The content of the silicosultone compound used in this example is 0.1% by weight, and the rest are the same as in Example 3, as shown in Table 1.

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Abstract

The invention relates to the technical field of lithium ion batteries, and discloses a lithium ion battery electrolyte and a lithium ion secondary battery. The electrolyte contains an organic solvent,a lithium salt and an additive, wherein the additive contains a silicon cyano sultone compound and at least one substance selected from fluoroethylene carbonate, ethylene sulfate, ethylene sulfite, propylene sulfate, propylene sulfite, 1, 3-propane sultone, adiponitrile, succinonitrile, vinylene carbonate and vinylethylene carbonate. The lithium ion secondary battery prepared from the lithium ionelectrolyte has excellent cycle performance and storage performance at high temperature and high pressure.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery electrolyte and a lithium ion secondary battery containing the electrolyte. Background technique [0002] Lithium-ion batteries are widely used in portable electronic products such as mobile phones, notebooks, and digital cameras because of their advantages such as high voltage, small size, light weight, high specific energy, no memory effect, no pollution, small self-discharge, and long life. . [0003] With economic development and scientific and technological progress, environmental and energy issues have become the focus of global attention. With the depletion of fossil energy and the development of new energy technologies, the technology of lithium-ion batteries used in automobile power has developed rapidly, which puts forward higher requirements for the performance of lithium-ion batteries. In order to meet the requirements of long-tim...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/4235H01M2300/0091Y02E60/10
Inventor 熊得军廖帅玲陈虎吕家斌J·W·江
Owner FARASIS TECH (GANZHOU) CO LTD