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Electrolyte for lithium secondary battery and lithium secondary battery comprising same

A lithium secondary battery and electrolyte technology, applied in non-aqueous electrolyte batteries, secondary batteries, battery electrodes, etc., can solve the problems of reducing SEI passivation ability, additional decomposition of electrolyte solution, etc., and achieve excellent capacity characteristics and excellent high temperature characteristics , Improve the effect of high temperature characteristics

Pending Publication Date: 2021-11-30
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, under high temperature conditions, since the by-products (generated by the decomposition reaction of the salt contained in the electrolyte solution) are activated and then decompose the SEI formed on the surface of the positive and negative electrodes to reduce the passivation ability of the SEI, it may lead to Additional decomposition of electrolyte solution and accompanying self-discharge

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

[0155] (1) Preparation of electrolyte for lithium secondary battery

[0156] LiPF 6 and LIN (FSO 2 ) 2 (Lithium bis(fluorosulfonyl)imide, LiFSI) is dissolved in an organic solvent in which ethylene carbonate and ethylmethyl carbonate are mixed in a volume ratio of 3:7, so that LiPF 6 The concentrations of LiFSI and LiFSI are 0.7M and 0.3M, respectively, and then, based on 100 parts by weight of the electrolyte for lithium secondary batteries, 0.5 parts by weight of the compound represented by formula 1h, 1 part by weight of the compound represented by formula 2b, and 1 part by weight of Ethylene sulfonate, 0.5 parts by weight of 1,3-propane sultone, 0.2 parts by weight of LiBF 4 and 6 parts by weight of fluorobenzene as other additives, thereby preparing an electrolyte for a lithium secondary battery.

[0157] (2) Preparation of lithium secondary battery

[0158] The positive electrode active material (Li(Ni 0.8 co 0.1 mn 0.1 )O 2 , NCM811), carbon black as a conducti...

Embodiment 2

[0162] The electrolyte and lithium secondary battery were prepared in the same manner as in Example 1, except that 0.5 parts by weight of the compound represented by formula 1h and 0.5 parts by weight of the compound represented by formula 2b were added when preparing the electrolyte for lithium secondary battery.

Embodiment 3

[0164] The electrolyte and lithium secondary battery were prepared in the same manner as in Example 1, except that 0.5 parts by weight of the compound represented by formula 1h and 4 parts by weight of the compound represented by formula 2b were added when preparing the electrolyte for lithium secondary battery.

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Abstract

The present invention relates to an electrolyte for a lithium secondary battery, comprising lithium salt, an organic solvent and an additive, wherein the additive comprises a compound represented by chemical formula 1 and a compound represented by chemical formula 2; and a lithium secondary battery comprising the electrolyte for the lithium secondary battery.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 2019-0010027 filed on January 25, 2019 and Korean Patent Application No. 2020-0008588 filed on January 22, 2020, the disclosures of which are incorporated herein by reference. [0003] The present invention relates to an electrolyte for a lithium secondary battery having excellent high-temperature characteristics and a lithium secondary battery including the electrolyte. Background technique [0004] With the development of the information society and the accompanying increase in the dependence of society as a whole on electric energy, personal IT devices and computer networks are developed, and thus it is necessary to develop technologies for efficiently storing and utilizing electric energy. [0005] A technology based on a secondary battery is the most suitable technology for various applications, among which, since the secondary ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/052H01M4/48H01M4/38
CPCY02E60/10H01M10/0567H01M10/0525H01M4/386H01M4/587H01M4/364H01M2300/0025H01M4/483H01M10/052
Inventor 安俞贺金铉承吴正友李哲行
Owner LG ENERGY SOLUTION LTD
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