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Electrolyte for lithium secondary battery and lithium secondary battery comprising same

A lithium secondary battery and electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, lithium batteries, etc., can solve problems such as increased battery resistance, reduced battery capacity, and reduced membrane passivation ability, to prevent Effects of increasing resistance, suppressing side reactions, and preventing self-discharge phenomenon

Active Publication Date: 2020-07-17
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the by-products of the salt are activated and then decompose the film formed on the surface of the positive and negative electrodes, there is a problem that the passivation ability of this film is reduced, causing additional decomposition of the electrolyte and the accompanying self-discharge
At this time, the transition metal is leached from the positive electrode active material, so that the capacity of the battery may decrease and the resistance in the battery may increase

Method used

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

Examples

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Embodiment approach

[0119] Hereinafter, the present invention will be described in more detail with reference to specific examples. However, the following examples are only for illustration of the present invention, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the scope and spirit of the invention, and it will be apparent that such changes and modifications are within the scope of the appended claims.

Embodiment 1

[0122] (1) Preparation of electrolyte solution for lithium secondary batteries

[0123] Add LiPF 6 to 1.2M to prepare 9.9g of electrolyte solution. After that, 0.1 g of the compound (5,5-dimethyl-3-morpholinyl-2-cyclohexen-1-one) represented by formula 1-4 was added as an additive to the above electrolytic solution to prepare lithium Electrolyte for secondary batteries.

[0124] (2) Manufacture of positive electrode

[0125] The cathode active material LiMn 2 o 4 (LMO), conductive material acetylene black, and binder polyvinylidene fluoride (PVDF) are mixed in 100 parts by weight of N-methyl-2-pyrrolidone (NMP) as a solvent in a weight ratio of 90.0:7.5:2.5 , to prepare positive electrode active material slurry. The positive electrode active material slurry was applied to a positive electrode current collector (Al thin film) with a thickness of 20 μm, dried, and then rolled to prepare a positive electrode.

experiment example 1

[0132] 1. Experimental Example 1: Measuring the Dissolution of Transition Metals

[0133] The respective positive electrodes prepared in Example 1 and Comparative Example were immersed in 5 ml of the respective electrolyte solutions for lithium secondary batteries, and stored in a high-temperature constant temperature room at 60° C. for 2 weeks. Thereafter, the positive electrode was removed, and a sample obtained by mixing 1 g of the electrolyte solution for lithium secondary batteries, 1.0 mL of ultrapure water, and 1.0 mL of nitric acid was placed in a platinum crucible, followed by heating and drying. Add 1.0 mL of nitric acid and 200 μl of hydrogen peroxide to the dried sample to dissolve it, then add 0.1 μl of internal standard (Sc), dilute with 10.0 mL of ultrapure water, and then use an inductively coupled plasma emission spectrometer (ICP -OES) analyzer for ICP-OES analysis. The ICP-OES analysis is carried out by measuring the content of transition metals (manganes...

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Abstract

The present invention relates to an electrolyte for a lithium secondary battery and a lithium secondary battery comprising same, the electrolyte comprising: lithium salt; an additive including a compound represented by chemical formula 1; and an organic solvent.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of 10-2018-0067431 first filed with the Korean Intellectual Property Office on June 12, 2018, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to an electrolyte solution for a lithium secondary battery and a lithium secondary battery comprising the same, more particularly to an electrolyte solution for a lithium secondary battery having improved battery performance by suppressing side reactions of lithium salts and an electrolyte comprising the same liquid lithium secondary battery. Background technique [0004] As personal IT equipment and computer networks are developed due to the development of the information society, society's dependence on electric energy has generally increased, and it is therefore necessary to develop technologies that efficiently store and utilize electric energy. [0005] Among the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/052H01M10/42
CPCH01M10/0567Y02E60/10H01M10/0525H01M10/4235H01M10/052H01M10/0568H01M10/0569H01M2300/0037
Inventor 金铉承李哲行安俞贺吴正友
Owner LG ENERGY SOLUTION LTD