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

A technology of electrolyte solution and lithium secondary battery, which is applied in the direction of non-aqueous electrolyte storage battery, secondary battery, lithium storage battery, etc. It can solve the problems of increased resistance and reduced redox center capacity, etc., achieve excellent high-temperature durability, and improve high-temperature storage Characteristics and initial capacity, effect of suppressing collapse phenomenon

Pending Publication Date: 2021-11-23
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dissolution of transition metals occurs at the positive electrode due to acid corrosion, resulting in increased resistance, and loss of redox centers may reduce capacity

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

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0144] (1) Preparation of electrolyte solution for lithium secondary battery

[0145] Mix ethylene carbonate (EC) and ethylmethyl carbonate (EMC) at a volume ratio of 3:7, and dissolve LiPF 6 and LiFSI to make LiPF 6 The concentrations of LiFSI and LiFSI were 0.7M and 0.3M, respectively, thus preparing non-aqueous organic solvents. Add 0.5g of the additive represented by Formula 1A-1, 0.1g of tetravinylsilane, 1.0g of lithium difluorophosphate, 1.0g of ethylene sulfonate, 0.5g of 1,3-propane sultone, 0.2g of LiBF 4 and 6.0 g of fluorobenzene were added to 90.7 g of a non-aqueous organic solvent to prepare an electrolyte solution for a lithium secondary battery.

[0146] (2) Preparation of lithium secondary battery

[0147] The positive electrode active material (Li(Ni 0.8 co 0.1 mn 0.1 )O 2 (NCM811): LiNi 0.6 co 0.2 mn 0.2 o 2 =70:30 weight ratio), carbon black as a conductive agent, and polyvinylidene fluoride (PVDF) as a binder are mixed in a weight ratio of 97.5:...

Embodiment 2

[0151] (1) Preparation of electrolyte solution for lithium secondary battery

[0152] Mix ethylene carbonate (EC) and ethylmethyl carbonate (EMC) at a volume ratio of 3:7, and dissolve LiPF 6 and LiFSI to make LiPF 6 The concentrations of LiFSI and LiFSI were 0.7M and 0.3M, respectively, thus preparing non-aqueous organic solvents. Add 0.2g of the additive represented by formula 1A-1, 0.1g of tetravinylsilane, 1.0g of lithium difluorophosphate, 1.0g of ethylene sulfonate, 0.5g of 1,3-propane sultone, 0.2g of LiBF 4 and 6.0 g of fluorobenzene were added to 91 g of a non-aqueous organic solvent to prepare an electrolyte solution for a lithium secondary battery.

[0153] (2) Preparation of lithium secondary battery

[0154] The positive electrode active material (Li(Ni 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 mixed in a weight ratio of 97.5:1:1.5, and then added to N-methyl-2-pyrrolidone as a ...

experiment example 1

[0162] Experimental example 1: Evaluation of storage characteristics at high temperature (60°C) (1)

[0163] After each lithium secondary battery prepared in Example 1 and Comparative Example 1 was activated at a CC of 0.1C, degassing was performed.

[0164] Subsequently, each lithium secondary battery was charged to 4.20V at a CC of 0.33C under constant current-constant voltage (CC-CV) conditions at 25°C, then cut off at a current of 0.05C, and charged at a CC of 0.33C. Discharge to 2.5V. The above charging and discharging was defined as one cycle, and after one cycle was completed, the remaining capacity (initial remaining capacity) was measured using a PNE-0506 charging / discharging device (manufacturer: PNE SOLUTION Co., Ltd., 5V, 6A).

[0165]Then, each lithium secondary battery was recharged to 100% state of charge (SOC) at a CC of 0.33C, and then CC-CV charged at a CC of 0.33C after further storage at high temperature (60°C) for 2 weeks. After discharging, the remainin...

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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

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 2018-0163440 filed on December 17, 2018, the disclosure of which is incorporated herein by reference. [0003] The present invention relates to an electrolyte solution for a lithium secondary battery and a lithium secondary battery including the electrolyte solution. Background technique [0004] Personal IT equipment and computer networks have grown along with the development of the information society, and society as a whole has become more dependent on electric energy, requiring the development of technologies that efficiently store and utilize electric energy. [0005] Among the technologies developed for this purpose, the technology based on secondary batteries is the most suitable technology for various applications. Interest in secondary batteries has arisen because they can be miniaturized to be suitable for personal IT equip...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0568H01M10/052H01M4/48C07D233/90
CPCH01M10/0567H01M10/0568Y02E60/10H01M4/483H01M4/364H01M4/587H01M10/0525H01M2300/0025H01M10/052C07D233/90H01M4/48H01M10/0569H01M2300/0028
Inventor 金铉承李哲行安俞贺吴正友
Owner LG ENERGY SOLUTION LTD
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