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

一种锂二次电池、非水性的技术，应用在二次电池、非水电解质、锂蓄电池等方向，能够解决二次电池总体性能降低等问题，达到整体性能改善的效果

Active Publication Date: 2020-04-21
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, another limitation may arise, that is, the overall performance of the secondary battery will be degraded due to other side effects caused by electrolyte additives.

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

Experimental program
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Effect test

Embodiment 1

[0155] (Preparation of non-aqueous electrolyte)

[0156]Mix 3.6 g of mixed additives (where lithium difluorophosphate (LiDFP), fluorobenzene (FB), tetravinylsilane (TVS) and 1,3-propane sultone are mixed in a weight ratio of 1:2:0.1:0.5 As an additive) was added to 96.4 g of an organic solvent (ethylene carbonate: ethyl methyl carbonate = volume ratio of 30:70 in which 1.0 M LiPF 6 ) to prepare the non-aqueous electrolyte of the present invention (see table 1 below).

[0157] (Preparation of electrodes)

[0158] The positive electrode active material (Li(Ni 0.6 mn 0.2 co 0.2 )O 2 ), a conductive agent (carbon black), and a binder (polyvinylidene fluoride) were added to N-methyl-2-pyrrolidone (NMP) as a solvent in a weight ratio of 90:5:5 to prepare a positive electrode active material Slurry (50% by weight solids). 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...

Embodiment 2

[0163] The non-aqueous electrolytic solution of the present invention and the secondary battery comprising the non-aqueous electrolytic solution were prepared in the same manner as in Example 1, except that 2.16 g of additives ( In which LiDFP, FB, TVS and PS were mixed in a weight ratio of 1:2:0.1:0.5 as additives) were added to 97.84 g of organic solvent (see Table 1 below).

Embodiment 3

[0165] The non-aqueous electrolytic solution of the present invention and the secondary battery comprising the non-aqueous electrolytic solution were prepared in the same manner as in Example 1, except that 5.4 g of additives ( where LiDFP, FB, TVS and PS were mixed in a weight ratio of 1:2:0.1:1.5 as additives) were added to 94.6 g of solvent (see Table 1 below).

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Abstract

The present invention relates to a non-aqueous electrolyte for a lithium secondary battery and a lithium secondary battery comprising the same and, specifically, to a non-aqueous electrolyte for a lithium secondary battery, the non-aqueous electrolyte comprising: a lithium salt; an organic solvent; and an additive, the additive being a mixture additive comprising lithium difluorophosphate, fluorobenzene, tetravinyl silane, and a compound containing one sulfonate group or sulfate group at a weight ratio of 1 : 2-8 : 0.05-0.3 : 0.5-2, and to a lithium secondary battery comprising the same.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 2017-0150920 filed on November 13, 2017 at the Korean Intellectual Property Office and Korean Patent Application No. 2018-0138408 filed on November 12, 2018, the disclosures of which are incorporated by reference method is incorporated into this article as a whole. technical field [0003] The present invention relates to a nonaqueous electrolytic solution for a lithium secondary battery and a lithium secondary battery including the nonaqueous electrolytic solution. Background technique [0004] Interest in energy storage technologies has grown in recent years, and research and development efforts on electrochemical devices have been put into practice as their applications have expanded to energy sources for cell phones, video cameras, laptops, and even electric vehicles. [0005] Among these electrochemical devices, there is int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M4/525H01M4/505H01M10/052
CPCH01M4/505H01M4/525H01M10/0567H01M10/0525Y02E60/10H01M2300/0025H01M10/052H01M2300/0037H01M10/0568H01M10/0569H01M2004/027H01M2004/028H01M2300/0051
Inventor 金贺恩林永敏金广渊李哲行
Owner LG ENERGY SOLUTION LTD
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