Electrolyte for rechargeable lithium battery and rechargeable lithium battery

A technology for electrolytes and lithium batteries, applied in the field of electrolytes for rechargeable lithium batteries and rechargeable lithium batteries, can solve problems such as poor safety, high-temperature performance degradation, and large amounts of gas

Pending Publication Date: 2022-06-03
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] LiPF 6 Is the most commonly used lithium salt in the electrolyte, but there is a problem with the tendency to react with the solvent in the electrolyte, causing solvent consumption and generating a large amount of gas
When LiPF 6 When decomposed, it generates LiF and PF 5 , leading to electrolyte depletion in the battery, resulting in degraded high-temperature performance and / or poor safety

Method used

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  • Electrolyte for rechargeable lithium battery and rechargeable lithium battery
  • Electrolyte for rechargeable lithium battery and rechargeable lithium battery
  • Electrolyte for rechargeable lithium battery and rechargeable lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0125] LiNi will be used as the positive electrode active material 0.8 Co 0.15 Al 0.05 O 2 , polyvinylidene fluoride as a binder, and carbon black as a conductive material were mixed in a weight ratio of 92:4:4, respectively, and then, dispersed in N-methylpyrrolidone to prepare a positive electrode active material slurry.

[0126] The positive electrode active material slurry was coated on Al foil to a thickness of 15 μm, dried at 100° C., and pressed to manufacture a positive electrode.

[0127] Graphite as an anode active material, polyvinylidene fluoride as a binder, and Ketjen black as a conductive material were mixed in a weight ratio of 98:1:1, and then, dispersed in N-methylpyrrolidone to A negative electrode active material slurry was prepared.

[0128] The negative electrode active material slurry was coated on Cu foil to a thickness of 10 μm, dried at 100° C., and pressed to manufacture a negative electrode.

[0129] The fabricated positive and negative electro...

Embodiment 2

[0138] A rechargeable lithium battery cell was fabricated according to substantially the same method as Example 1 except that the content (eg, amount) of the compound represented by Chemical Formula 1 was changed to 0.75 wt %.

Embodiment 3

[0140] A rechargeable lithium battery cell was fabricated according to substantially the same method as Example 1 except that the content (eg, amount) of the compound represented by Chemical Formula 1 was changed to 1 wt %.

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Abstract

The invention relates to an electrolyte for a rechargeable lithium battery and a rechargeable lithium battery. An electrolyte for a rechargeable lithium battery includes a non-aqueous organic solvent, a lithium salt, and an additive, where the additive includes a compound represented by Chemical Formula 1 and a compound represented by Chemical Formula 2: wherein X is a fluoro group, a chloro group, a bromo group, or an iodo group, and A is a C1 to C10 alkylene group or (C2H4-O-C2H4) m, where m is an integer selected from 1 to 10.

Description

technical field [0001] One or more aspects of embodiments of the present disclosure relate to electrolytes for rechargeable lithium batteries and rechargeable lithium batteries including the same. Background technique [0002] Rechargeable lithium batteries can be recharged and can have a high per unit three or more times the energy density per unit weight of lead batteries, nickel cadmium batteries, nickel metal hydride batteries and / or nickel zinc batteries, etc. Weight energy density. It can also be charged at a high rate, and is therefore commercially suitable for laptop computers, cellular phones, power tools and / or electric bicycles, etc., and research is ongoing to improve additional energy densities. [0003] An example rechargeable lithium battery is fabricated by injecting an electrolyte into a battery cell including a positive electrode including a positive active material capable of intercalating / deintercalating lithium ions and a negative electrode including a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/0569H01M10/0567
CPCH01M10/052H01M10/0569H01M10/0567H01M10/0525H01M10/0565
Inventor 崔兹奉金明勋金相勋金允熙朴仁俊朴弘烈申政珉吴承龙郑明焕
Owner SAMSUNG SDI CO LTD
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