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Electrode for lithium secondary battery, lithium secondary battery using same and method for manufacturing same

A lithium secondary battery and electrode technology, which is applied to the electrode of inorganic particles, lithium secondary battery and its preparation field, can solve the problems of low interface characteristics, uneven electrolyte distribution, and reduced lifespan, so as to improve interface characteristics and prolong lifespan And high-efficiency discharge characteristics, the effect of uniform distribution

Inactive Publication Date: 2015-09-30
IUCF HYU (IND UNIV COOP FOUNDATION HANYANG UNIV)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, such polymer electrolytes are excellent in terms of internal short circuit and safety, but have lower interfacial properties with electrodes than liquid electrolytes, and thus have high internal resistance of batteries.
Therefore, the IR drop (IR drop) increases, the capacity decreases, and the lifetime decreases during charging and discharging
Furthermore, when polymer electrolytes are prepared by in situ methods to enhance interfacial properties, the distribution of electrolytes within electrodes may become inhomogeneous.

Method used

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  • Electrode for lithium secondary battery, lithium secondary battery using same and method for manufacturing same
  • Electrode for lithium secondary battery, lithium secondary battery using same and method for manufacturing same
  • Electrode for lithium secondary battery, lithium secondary battery using same and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0069] At room temperature, 150 ml of pure water was put into the reactor, and 10 ml of vinyltrimethoxysilane was measured to be slowly dropped into the reactor, and stirred. Vinyltrimethoxysilane became transparent after being completely dispersed in purified water, added to 0.1 ml of ammonia solution and stirred at room temperature for 12 hours to conduct condensation polymerization. After the reaction was completed, a precipitate was prepared from the resulting liquid using a centrifuge. The precipitate was washed three or more times with methanol and filtered to remove unreacted materials and impurities. The prepared precipitate was dried in a vacuum oven at 70° C. for 1 hour to obtain silica, which had a size of 1.2 μm and was capable of being polymerized.

[0070] In addition, silica capable of being polymerized is synthesized in various sizes using the methods described above. The nitric acid solution is first introduced into purified water and reacted.

[0071] The ...

experiment example 2

[0077] Inorganic materials other than silica are reacted with vinyltriethoxysilane or 3-(triethoxysilyl)propyl methacrylate to introduce vinyl or acrylate groups into various inorganic on the surface of the particles.

[0078]Aluminum isopropoxide is dispersed in water and stirred. A nitric acid solution was added as a catalyst, and reacted at 90° C. for 6 hours, thereby forming alumina particles. Then, after introducing vinyltriethoxysilane or 3-(triethoxysilyl)propylmethacrylate and stirring at 90°C for 1 hour, the precipitate was washed to obtain the final product

[0079] Figure 4 is the FT-IR spectrum of the silica particles prepared in Experimental Example 2. It should be understood that there exist at about 1,630cm -1 -1,400cm -1 Vinyl groups that can be synthesized with alumina particles in the infrared absorption range.

[0080] In the same way, polymeric organic functional groups are introduced into various inorganic materials, such as titanium, germanium and / ...

experiment example 3

[0083] Negative electrodes for lithium secondary batteries were prepared using natural graphite. The DAG-A active material, which is natural graphite, and the silica having vinyl groups synthesized in Experimental Example 1 were dispersed by dry mixing. KS6 and Super-P (which is a conductive material), binder PVdF, and solvent NMP were introduced to prepare electrode paste. The electrode slurry was coated on an aluminum foil, and the solvent was taken out of a vacuum oven at 120° C., thereby completing an electrode.

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Abstract

An electrode for a lithium secondary battery, a lithium secondary battery using the same and a method for manufacturing the same are provided. The electrode for a lithium secondary battery comprises: a current collector; an electrode active material layer located on the current collector; and inorganic particles having two or more radical polymerization functional groups are dispersed on the electrode active material layer. Accordingly, since a polymerization reaction can directly occur between monomers and the inorganic particles in a precursor solution when a polymer electrolyte is formed by in-situ polymerization, an interface between the electrode and the electrolyte can be improved. In addition, the distribution of the polymer electrolyte within the electrode can be uniform. Therefore, improved life and highly efficient discharging can be exhibited when charging and discharging the lithium secondary battery.

Description

technical field [0001] The present invention relates to a secondary battery, and more particularly, to an electrode for a lithium secondary battery into which inorganic particles having polymeric functional groups are introduced, a lithium secondary battery using the electrode, and a preparation method thereof. Background technique [0002] A lithium secondary battery is a secondary battery that can be charged with energy from an external power source and has many advantages, such as higher energy density and longer life than conventionally used nickel-cadmium batteries or nickel-metal hydride batteries. Recently, due to the advent of electric vehicles in addition to smartphones and tablet personal computers (PCs), demand for medium- and large-sized lithium-ion batteries capable of storing large amounts of energy is increasing. [0003] Liquid electrolytes used in conventional lithium secondary batteries have advantages of being suitable for realizing high power output and h...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/13H01M10/052H01M10/0565
CPCY02E60/122H01M4/622H01M10/052H01M4/13Y02T10/7011H01M10/0565Y02E60/10H01M4/62
Inventor 金东元申元炅
Owner IUCF HYU (IND UNIV COOP FOUNDATION HANYANG UNIV)
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