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Non-aqueous electrolyte for lithium secondary battery, and lithium secondary battery comprising same

A lithium secondary battery, non-aqueous electrolyte technology, applied in the direction of non-aqueous electrolyte, secondary battery, secondary battery gas removal, etc., can solve the problems of reducing life characteristics, increasing battery resistance, etc., to improve stability, suppress additional The effect of decomposition

Pending Publication Date: 2021-11-26
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lewis acids (such as PF 5 ) not only lead to the decomposition of organic solvents (such as ethyl carbonate), but also destroy the solid electrolyte interface (SEI) formed by reduction reactions on the surface of active materials with operating voltages outside the electrochemical stability window of the electrolyte solution, Thereby increasing the resistance of the battery and degrading the lifetime characteristics

Method used

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  • Non-aqueous electrolyte for lithium secondary battery, and lithium secondary battery comprising same
  • Non-aqueous electrolyte for lithium secondary battery, and lithium secondary battery comprising same
  • Non-aqueous electrolyte for lithium secondary battery, and lithium secondary battery comprising same

Examples

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Effect test

Embodiment 1

[0126] (preparation of non-aqueous electrolyte)

[0127] LiPF 6 LiPF was dissolved in 99.9 g of non-aqueous organic solvent in which ethylene carbonate (EC) and ethylmethyl carbonate (EMC) were mixed in a volume ratio of 30:70 to make LiPF 6 The concentration was 1.0 M, and then a nonaqueous electrolyte was prepared by adding 0.1 g of the compound represented by Formula 1 as an additive.

[0128] (cathode preparation)

[0129] 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 were added to N-methyl-2-pyrrolidone (NMP) as a solvent in a weight ratio of 90:5:5 To prepare positive electrode active material slurry (solid content 48% by weight). A 100 μm thick positive electrode current collector (Al thin film) was coated with the positive electrode active material slurry, dried and rolled to prepare a positive electrode.

[0130] (Negative Electrode Preparati...

Embodiment 2

[0135] A lithium secondary battery was prepared in the same manner as in Example 1, except that LiPF 6 LiPF was dissolved in 99.5 g of a non-aqueous organic solvent in which ethylene carbonate (EC) and ethylmethyl carbonate (EMC) were mixed in a volume ratio of 30:70 to make LiPF 6 The concentration was 1.0 M, and then a nonaqueous electrolyte was prepared by adding 0.5 g of the compound represented by Formula 1 as an additive.

Embodiment 3

[0137] A lithium secondary battery was prepared in the same manner as in Example 1, except that LiPF 6 LiPF was dissolved in 99 g of non-aqueous organic solvent in which ethylene carbonate (EC) and ethylmethyl carbonate (EMC) were mixed in a volume ratio of 30:70 to make LiPF 6 The concentration was 1.0 M, and then a nonaqueous electrolyte was prepared by adding 1 g of the compound represented by Formula 1 as an additive.

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Abstract

The present invention relates to a non-aqueous electrolyte for a lithium secondary battery, comprising: an organic solvent; a lithium salt; and a compound represented by the following chemical formula 1, and to 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. 10-2019-0050870 filed on April 30, 2019, the disclosure of which is incorporated herein by reference. [0003] The present invention relates to a nonaqueous electrolyte for a lithium secondary battery and a lithium secondary battery comprising the same, more specifically, to a nonaqueous electrolyte for a lithium secondary battery comprising an electrolyte additive and a lithium secondary battery comprising the same, the electrolyte additive The resistance increase during high-temperature exposure can be suppressed by minimizing the membrane-damaging reactions during intercalation and deintercalation of lithium (Li) ions during charge / discharge by forming a stable solid electrolyte interface (SEI) on the electrode interface. Background technique [0004] Recently, attention has been increasing on energy storage technology, and as th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/42H01M10/52H01M4/525H01M4/587H01M4/36H01M10/0525
CPCH01M10/0567H01M10/0525H01M10/4235H01M4/133H01M2300/0025Y02E60/10H01M10/52H01M4/525H01M4/587H01M4/364H01M4/386H01M4/505H01M2004/027H01M2004/028
Inventor 吴正友李哲行金亨泰
Owner LG ENERGY SOLUTION LTD