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Non-aqueous electrolytic solution, and lithium secondary battery comprising same

A non-aqueous electrolyte, lithium secondary battery technology, applied in non-aqueous electrolyte batteries, non-aqueous electrolytes, secondary batteries, etc., can solve the problems of increased resistance, inapplicability, etc., to improve high-temperature life and improve high-temperature storage performance. Effect

Pending Publication Date: 2021-12-31
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional nitrile additives, although known to be effective in suppressing high-temperature deterioration to a certain extent, are not suitable for batteries requiring high output characteristics due to increased resistance

Method used

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  • Non-aqueous electrolytic solution, and lithium secondary battery comprising same
  • Non-aqueous electrolytic solution, and lithium secondary battery comprising same
  • Non-aqueous electrolytic solution, and lithium secondary battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0140] (preparation of non-aqueous electrolyte)

[0141] LiPF 6 Dissolved in 98.5 g of non-aqueous organic solvent in which ethylene carbonate (EC) and ethylmethyl carbonate (EMC) were mixed in a volume ratio of 30:70, so that LiPF 6 The concentration of is 1.0 M, and thereafter, a nonaqueous electrolyte is prepared by adding 0.5 g of the compound represented by the formula I-1 and 1.0 g of the compound represented by the formula II-1 as additives.

[0142] (preparation of positive electrode)

[0143] Lithium-nickel-manganese-cobalt-based oxide (LiNi 0.8 co 0.1 mn 0.1 o 2 ; NCM811), carbon black as a conductive agent and polyvinylidene fluoride (PVDF) as a binder are added in N-methyl-2-pyrrolidone (NMP) as a solvent in a weight ratio of 90:5:5, A cathode active material slurry (solid content: 48% by weight) was thus prepared. A 100 μm thick positive electrode current collector (Al thin film) was coated with the positive electrode active material slurry, dried and rolle...

Embodiment 2

[0149] A lithium secondary battery was prepared in the same manner as in Example 1, except that LiPF 6 Dissolved in 98.0g non-aqueous organic solvent, making LiPF 6 The concentration of is 1.0 M, and thereafter, a nonaqueous electrolyte is prepared by adding 1.0 g of the compound represented by the formula I-1 and 1.0 g of the compound represented by the formula II-1 as additives.

Embodiment 3

[0151] A lithium secondary battery was prepared in the same manner as in Example 1, except that LiPF 6 Dissolved in 98.0g non-aqueous organic solvent, making LiPF 6 The concentration of is 1.0M, and thereafter, a nonaqueous electrolyte is prepared by adding 1.5 g of the compound represented by the formula I-1 and 0.5 g of the compound represented by the formula II-1 as additives.

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Abstract

The present invention relates to: a non-aqueous electrolytic solution including an organic solvent, a lithium salt, and an additive, wherein the additive includes a compound represented by chemical formula I and a compound represented by chemical formula II; and a lithium secondary battery comprising same.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 10-2019-0107365 filed on August 30, 2019, the disclosure of which is incorporated herein by reference. technical field [0003] The present invention relates to a nonaqueous electrolyte and a lithium secondary battery containing the same, and more particularly, the present invention relates to a nonaqueous electrolyte and a lithium secondary battery containing the same which can suppress resistance increase and transition metal elution during high-temperature storage. Background technique [0004] A lithium secondary battery is generally produced by a method in which an electrode assembly is formed by disposing a separator between a positive electrode comprising a positive electrode active material formed of a lithium-containing transition metal oxide and a negative electrode comprising a negative electrode active material capable of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/0567
CPCH01M10/056H01M10/0567H01M4/525H01M4/587H01M2300/0025H01M4/364H01M4/386H01M4/483H01M10/0525H01M10/4235H01M10/052C07C255/03H01M4/131H01M4/134H01M10/0568H01M10/0569H01M2004/027H01M2004/028
Inventor 吴正友金亨泰李哲行
Owner LG ENERGY SOLUTION LTD
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