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

一种非水电解液、锂二次电池的技术，应用在非水电解质蓄电池、二次电池、锂蓄电池等方向，能够解决充放电循环寿命缩短、没有有效的方案等问题

Active Publication Date: 2013-04-24
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve these problems, a variety of additives for non-aqueous electrolytes have been proposed to prevent battery swelling, however, there is still no effective solution
For example, when succinonitrile is added to the electrolyte, the swelling can be suppressed to a certain extent, but the charge-discharge cycle life is shortened

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079]

[0080] In an Ar atmosphere, with respect to 100 parts by weight of the electrolyte, 1 part by weight of vinylene carbonate (VC), 3 parts by weight of fluoroethylene carbonate (FEC) and 1 part by weight of ethylene glycol bis(2- Cyanoethyl) ether (EGPN) was added to 1M LiPF dissolved in ethylene carbonate:propylene carbonate:diethyl carbonate (3:2:5 by weight) 6 in the electrolyte.

[0081]

[0082] LiCoO as the cathode active material at a weight ratio of 93:4:4 2 , polyvinylidene fluoride (PVdF) as a binder, and carbon as a conductive material were mixed and then dispersed in N-methyl-2-pyrrolidone to prepare a positive electrode slurry coated on a 15 μm thick aluminum foil , followed by drying and calendering to fabricate the cathode.

[0083] Natural graphite as negative electrode active material, styrene-butadiene rubber (SBR) as binder, and carboxymethyl cellulose as thickener were mixed at a weight ratio of 96:2:2, and then dispersed in water to An anode ...

Embodiment 2

[0086]

[0087] Under the Ar atmosphere, with respect to 100 parts by weight of the electrolyte, 2 parts by weight of vinylene carbonate (VC), 2 parts by weight of fluoroethylene carbonate (FEC) and 3 parts by weight of ethylene glycol bis(2- Cyanoethyl) ether (EGPN) was added to 1M LiPF dissolved in ethylene carbonate: ethyl propionate: diethyl carbonate (4:1:5 by weight) 6 in the electrolyte.

[0088]

[0089] A battery containing the electrolytic solution of Example 2 was fabricated in the same manner as in Example 1 except that the fabricated battery was a prismatic battery.

Embodiment 3

[0091] A nonaqueous electrolytic solution and a battery were fabricated in the same manner as in Example 1 except that 2 parts by weight of ethylene glycol bis(2-cyanoethyl)ether (EGPN) was added.

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Abstract

The present invention relates to a non-aqueous electrolyte solution for a lithium secondary battery and to a lithium secondary battery comprising same. According to the present invention, a non-aqueous electrolyte solution, comprising an ionizable lithium salt and an organic solvent, comprises: (a) 1 to 10 parts by weight of a compound containing a vinylene group or a vinyl group, relative to a total of 100 parts by weight of the non-aqueous electrolyte solution; and (b) 10 to 300 parts by weight of a dinitrile compound having an ether bond, relative to 100 parts by weight of the compound containing the vinylene group or the vinyl group. The lithium secondary battery comprising the non-aqueous electrolyte solution of the present invention may effectively inhibit the swelling of the battery and improve the charge and discharge cycles of the battery.

Description

technical field [0001] This application claims priority from Korean Patent Application No. 10-2010-0078417 filed on Aug. 13, 2010, the entire contents of which are incorporated herein by reference. [0002] This application also claims priority to Korean Patent Application No. 10-2011-0080493 filed on Aug. 12, 2011, the entire contents of which are incorporated herein by reference. [0003] The present invention relates to a non-aqueous electrolytic solution for a lithium secondary battery and a lithium secondary battery containing the non-aqueous electrolytic solution, the non-aqueous electrolytic solution including a dinitrile-based additive to improve cycle life and suppress swelling. Background technique [0004] Recently, there has been an increasing interest in energy storage technologies. As the field of application of energy storage technology expands to mobile phones, camcorders, laptop computers, and even electric vehicles, the demand for high energy density of ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/052H01M4/62
CPCH01M10/0567Y02E60/122H01M10/0569H01M10/056Y02T10/7011H01M10/052H01M4/62Y02E60/10C07C255/01Y02T10/70
Inventor 洪莲叔崔权永吴宰丞李秉培郑京焕沈慧荣
Owner LG ENERGY SOLUTION LTD
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