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Lithium secondary battery including non-aqueous electrolyte solution

a secondary battery and lithium battery technology, applied in the direction of cell components, sustainable manufacturing/processing, final product manufacturing, etc., can solve the problems of difficult to expect the improvement of low-temperature output characteristics, degraded high-temperature storage performance and life performance of batteries, etc., to achieve excellent low-temperature output characteristics and improve high-temperature storage characteristics and life characteristics. , the effect of improving the quality of li

Inactive Publication Date: 2018-07-05
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent is for a new type of battery that uses a special electrolyte solution. This solution prevents damage to the battery during charging and discharging, which can improve its performance and lifespan. The result is a better-performing and longer-lasting battery.

Problems solved by technology

Conventionally, with respect to an electrolyte solution which does not include an electrolyte solution additive or includes an electrolyte solution additive having poor characteristics, it may he difficult to expect the improvement of low-temperature output characteristics due to the formation of a non-uniform SEI.
Also, since a decomposition reaction of the electrolyte solution occurs when the lithium secondary battery is stored at high temperature, high-temperature storage performance and life performance of the battery may be degraded.

Method used

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  • Lithium secondary battery including non-aqueous electrolyte solution
  • Lithium secondary battery including non-aqueous electrolyte solution
  • Lithium secondary battery including non-aqueous electrolyte solution

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0044][Preparation of Electrolyte Solution]

[0045]A non-aqueous electrolyte solution was prepared by adding 0.9 mol / L of LiPF6, as a lithium salt, based on a total amount of the non-aqueous electrolyte solution and adding 0.1 mol / L of lithium bis(fluorosulfonyi)imide and 3 wt % of 2,3-difluorobiphenyi to a non-aqueous organic solvent having a composition in which a volume ratio of ethylene carbonate (EC):ethylmethyl carbonate (EMC) was 3:7.

[0046][Preparation of Lithium Secondary Battery]

[0047]A positive electrode mixture slurry was prepared by adding 92 wt % of Li(Ni0.6Co0.2Mn0.2)O0.2)O2 as a positive electrode active material, 4 wt % of carbon black as a conductive agent, and 4 wt % of polyvinylidene fluoride (PVdF) as a binder to N-methyl-2-pyrrolidone (NMP) as a solvent. An about 20 μm thick aluminum (Al) thin film as a positive electrode collector was coated with the positive electrode mixture slurry and dried, and the coated Al thin film was then roll-pressed to prepare a positi...

example 2

[0050]A non-aqueous electrolyte solution and a lithium secondary battery were prepared in the same manner as in Example 1 except that 0.7 mol / L of LiPF6 and 0.3 mol / L of lithium bis(fluorosulfonyl)imide were used.

example 3

[0051]A non-aqueous electrolyte solution and a lithium secondary battery were prepared in the same manner as in Example 1 except that 0.5 mol / L of LiPF6 and 0.5 mol / L of lithium bis(fluorosulfonyi)imide were used.

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Abstract

The present invention relates to a lithium secondary battery which includes a non-aqueous electrolyte solution including lithium bis(fluorosulfonyl)imide (LiFSI) and a fluorobiphenyl compound, a positive electrode including a lithium-nickel-manganese-cobalt-based oxide as a positive electrode active material, a negative electrode, and a separator.In the lithium secondary battery including a non-aqueous electrolyte solution for a lithium secondary battery of the present invention, since the non-aqueous electrolyte solution may form a robust solid electrolyte interface (SEI) on the negative electrode during initial charge and may prevent decomposition of the surface of the positive electrode and an oxidation reaction of the electrolyte solution during a high-temperature cycle, excellent low-temperature output characteristics as well as improved high-temperature storage characteristics and life characteristics may be achieved.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of Korean Patent Application No. 10-2015-0138029, filed on Sep. 30, 2015, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference.TECHNICAL FIELDTechnical Field[0002]The present invention relates to a lithium secondary battery which includes a non-aqueous electrolyte solution including lithium bis(fluorosulfonyl)imide (LiFSI) and a fluorobiphenyl compound, a positive electrode including a lithium-nickel-manganese-cobalt-based oxide as a positive electrode active material, a negative electrode, and a separator.Background Art[0003]Demand for secondary batteries as an energy source has been significantly increased as technology development and demand with respect to mobile devices have increased. Among these secondary batteries, lithium secondary batteries having high energy density and high voltage have been commercialized and widely used.[00...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01M10/052H01M10/0567H01M10/0569H01M4/52H01M4/50H01M2/14H01M50/40
CPCH01M10/052H01M10/0567H01M10/0569H01M4/52H01M4/50H01M2/14H01M2004/028H01M2004/027H01M2300/0034H01M2300/0065H01M10/0568H01M4/505H01M4/525Y02E60/10H01M50/40Y02P70/50
Inventor KIM, HA EUNLIM, YOUNG MINLEE, CHUL HAENGKIM, MIN JUNGKIM, GWANG YEON
Owner LG ENERGY SOLUTION LTD
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