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Polymer electrolyte for secondary battery and lithium secondary battery comprising same

A secondary battery and polymer technology, applied in the direction of non-aqueous electrolyte batteries, secondary batteries, electrolytes, etc., can solve the problems of deteriorating mechanical properties, interfering with metal salt migration, reducing energy characteristics, etc., achieving excellent mechanical strength, improving electrical properties, etc. The effect of chemical stability

Active Publication Date: 2019-12-13
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyethylene oxide interferes with the migration of metal salts due to its semi-crystalline structure at room temperature
As a result, polyethylene oxide may not be suitable due to not only degraded energy characteristics but also mechanical properties due to its low ionic conductivity value of about 1.0×10-8S / cm at room temperature commercialized

Method used

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  • Polymer electrolyte for secondary battery and lithium secondary battery comprising same
  • Polymer electrolyte for secondary battery and lithium secondary battery comprising same
  • Polymer electrolyte for secondary battery and lithium secondary battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0187] (electrode preparation)

[0188] By using 94 parts by weight of 4.2V LiCoO-like as the positive electrode active material 2 compound, 4 parts by weight of carbon black as a conductive agent, and 2 parts by weight of polyvinylidene fluoride (PVDF) as a binder component were added to N-methyl-2-pyrrolidone (NMP) as a solvent to prepare A cathode active material slurry having a solid content of 90% by weight.

[0189] The surface of a 20 μm-thick aluminum (Al) film was coated with the positive electrode active material slurry to a thickness of 10 μm, and then dried to prepare a positive electrode plate.

[0190] A copper (Cu) thin film was coated with lithium metal and then rolled to prepare a 20 μm thick negative electrode plate.

[0191] (preparation of polymer electrolyte)

[0192] 100 g of the first polymer (weight average molecular weight (Mw)=50,000 g / mol, n 1 =490), 10 g of vinyl acetate (VAc), and 0.1 g of a UV polymerization initiator (2-hydroxy-2-methylpropio...

Embodiment 2

[0197] A polymer electrolyte membrane and a pouch-type secondary battery including the polymer electrolyte membrane were prepared in the same manner as in Example 1, except that methyl methacrylate (MMA) was used during the preparation of the polymer electrolyte instead of Vinyl acetate (see Table 1 below).

Embodiment 3

[0199] A polymer electrolyte membrane and a pouch-type secondary battery including the polymer electrolyte membrane were prepared in the same manner as in Example 1, except that 20 g of vinyl acetate was used during the preparation of the polymer electrolyte (see Table 1 below) .

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Abstract

The present invention relates to a polymer electrolyte for a secondary battery and a lithium secondary battery comprising the same and, specifically, to a polymer electrolyte for a secondary battery,the polymer electrolyte comprising: a first polymer comprising a repeating unit represented by chemical formula 1 below; and a second polymer comprising a repeating unit derived from a monomer havingat least one ethylene-based unsaturated group or an oligomer thereof, 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. 2017-0094959 filed on July 26, 2017 and Korean Patent Application No. 2018-0086713 filed on July 25, 2018 at the Korean Intellectual Property Office, incorporated by reference The disclosures of the above-mentioned patent applications are incorporated herein in their entirety. technical field [0003] The present invention relates to a polymer electrolyte for a secondary battery and a lithium secondary battery including the polymer electrolyte. Background technique [0004] With the rapid growth of electric power, electronics, communication, and computer industries, the demand for high-performance, high-stability secondary batteries is increasing. In particular, in line with the trend toward miniaturization and weight reduction of electronic (communication) devices, thin-film and miniaturized lithium secondary batteries are requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0568H01M4/139H01M2/16H01M10/052C08L69/00C08L31/04H01M50/491H01M50/494H01M50/497
CPCC08L69/00H01M10/052H01M10/0565Y02E60/10H01M2300/0082H01M4/131H01M50/491H01M50/497H01M50/494C08F283/02C08L31/04C08F218/08H01M10/0568H01M4/139H01M50/449H01M2300/0091H01M10/0567H01M50/403H01M50/409H01M2300/0025C08J5/18C08J2369/00H01M10/0525
Inventor 朴卛智安庆昊李哲行韓俊赫
Owner LG ENERGY SOLUTION LTD
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