Gel polymer electrolyte and lithium secondary battery comprising same

A technology of gel polymer and electrolyte, applied in the field of rights and interests of .10-2015-0139401, can solve the problems of mechanical properties decline, short circuit of polymer electrolyte, etc.

Active Publication Date: 2017-05-31
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this case, there may be limitations in improving the performance and safety of the battery, for example, due to the short circuit of the positive and negative electrodes during the preparation of the battery, the degradation of mechanical properties and the short circuit of the polymer electrolyte

Method used

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  • Gel polymer electrolyte and lithium secondary battery comprising same
  • Gel polymer electrolyte and lithium secondary battery comprising same
  • Gel polymer electrolyte and lithium secondary battery comprising same

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Embodiment approach

[0384] According to an exemplary embodiment of the present invention, the present invention may include (a) inserting an electrode assembly formed of a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode into a battery case, and (b) The composition for a gel polymer electrolyte according to the present invention is injected into a battery case, and the composition is polymerized to form a gel polymer electrolyte.

[0385] In-situ polymerization in lithium secondary batteries may be performed by using electron beams, gamma rays, and room temperature / high temperature aging processes, and, according to one embodiment of the present invention, in-situ polymerization may be performed by thermal polymerization. In this case, the desired polymerization time may range from about 2 minutes to about 12 hours, and the thermal polymerization temperature may range from 30°C to 100°C.

[0386] Specifically, in the in...

Embodiment 1

[0413] By adding LiPF 6 Dissolved in a non-aqueous electrolyte solvent having a volume ratio of ethylene carbonate (EC): ethylmethyl carbonate (EMC): dimethyl carbonate (DMC) of 2:3:5 to obtain 1M LiPF 6 concentration to prepare the electrolyte. By adding 5% of the oligomer of formula 7a (molecular weight 7800, 2mol unit A, unit B: unit C: unit D: unit E molar ratio is 4.7:33.4:14.3:47.6), based on the total amount of oligomer 0.5% by weight of 2,2'-azobis(isobutyronitrile) (AIBN) as a polymerization initiator, and 0.5% of vinylene carbonate (VC) to prepare a composition for gel polymer electrolyte.

Embodiment 2

[0415] By adding LiPF 6 Dissolved in a non-aqueous electrolyte solvent having a volume ratio of ethylene carbonate (EC): ethylmethyl carbonate (EMC): dimethyl carbonate (DMC) of 2:3:5 to obtain 1M LiPF 6 concentration to prepare the electrolyte. By adding 5% of the oligomer of formula 7b (molecular weight 8500, 2mol unit A, unit C: unit D: unit E molar ratio is 30:26:44), based on 0.5% by weight of the total amount of oligomer AIBN was used as a polymerization initiator, and 0.5% VC was used to prepare the composition for gel polymer electrolyte.

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Abstract

The present invention relates to a gel polymer electrolyte and a lithium secondary battery comprising same, the gel polymer electrolyte comprising a polymer network and an electrolyte solution impregnated on the polymer network, wherein the polymer network is formed having an oligomer bound in a three-dimensional structure, the oligomer comprising: a unit A which is derived from a monomer comprising at least one or more of a copolymerizable acrylate or acrylic acid; a unit C which comprises urethane; and a unit E which comprises siloxane.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims the benefit of Korean Patent Application No. 10-2014-0133433 filed with the Korean Intellectual Property Office on October 2, 2014 and Korean Patent Application No. 10- filed with the Korean Intellectual Property Office on October 2, 2015 2015-0139401, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to a gel polymer electrolyte and a lithium secondary battery comprising the gel polymer electrolyte. Background technique [0004] With the advancement of technology and the increase in demand for mobile devices, the demand for secondary batteries as an energy source has significantly increased. Among these secondary batteries, lithium secondary batteries having high energy density and high voltage have been commercialized and widely used. [0005] Lithium metal oxides are used as positive elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/0565G02F1/153
CPCG02F1/153H01M10/052H01M10/0565H01M10/0525H01M10/0569Y02E60/10H01M2300/0028H01M2300/0082
Inventor 安庆昊吴正友李哲行郑理珍朴卛智
Owner LG ENERGY SOLUTION LTD
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