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Electrochemical device

An electrochemical and current interrupt device technology, applied in electrochemical generators, batteries, circuits, etc., can solve the problems of accelerating capacity, increasing side reactions, deterioration, etc., to achieve the effect of accelerating capacity deterioration and increasing side reactions

Inactive Publication Date: 2017-08-29
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, the above-mentioned technologies do not realize that the gas generated by the oxidation reaction of the electrolyte due to the high voltage may reduce the reaction area of ​​the electrode surface and further increase the side reaction, thereby accelerating the problem of capacity degradation, and these technologies also Did not propose any solution to the problem

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0107] A composition for forming an anode active material layer is prepared by mixing graphite, carbon black conductive material, and PVdF binder in N-methylpyrrolidone solvent, and then applying the composition to a copper current collector to form Negative electrode active material layer.

[0108] A composition for forming a positive electrode active material layer prepared by mixing LNMO positive electrode active material, carbon black conductive material, and PVdF binder in an N-methylpyrrolidone solvent, and then applying the composition to an aluminum current collector On, a positive electrode active material layer is formed.

[0109] An electrode assembly was prepared by inserting a porous polyethylene separator between the positive electrode and graphite negative electrode prepared as described above, and by placing the electrode assembly in a case and injecting an electrolyte until the available space volume (EV) relative to the case A lithium secondary battery was p...

experiment Embodiment 1

[0113] (Experimental Example 1: Detect the physical properties of the prepared secondary battery)

[0114] The lithium secondary battery prepared in this example has an available space volume (EV) of 20% by volume relative to the total volume of the cavity (CV) in the case, and 80% by volume, and when the lithium secondary battery is charged at 1C and discharged at 1C at 25°C, and the charge and discharge are taken as one cycle, and the cycle is repeated 100 times, at 25°C and 1kgf / cm 2 Under certain conditions, the volume (GV) occupied by the gas generated in the lithium secondary battery is 6 times the available space volume (EV), and the pressure in the casing is 6kgf / cm 2 .

[0115] The lithium secondary battery prepared in the above comparative example has an available space volume (EV) of 46% by volume relative to the total cavity volume (CV) in the case, and an 56% by volume, and in the state where the lithium secondary battery is charged at 1C and discharged at 1C at...

experiment Embodiment 2

[0116] (Experimental Example 2: Detection of Lifetime Characteristics)

[0117] The battery life characteristics of the lithium secondary batteries prepared in the above Examples and Comparative Examples were examined. Under the condition of 1C / 1C charge / discharge at 25°C, 100 charge and discharge cycles were carried out, and two measurements were carried out for each case. The results are listed in Figure 4 . exist Figure 5 Among them, the examples show the case of a large amount of electrolytic solution, and the comparative examples show the case of a small amount of electrolytic solution.

[0118] refer to Figure 5 , it can be seen that the lithium secondary battery manufactured in this example has reduced capacity degradation compared to the lithium secondary battery prepared in Comparative Example, thereby improving life characteristics.

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Abstract

An electrochemical device of the present invention comprises: a case; an electrode assembly disposed inside the case and comprising a positive electrode, a negative electrode, and a separator interposed between the negative electrode and the positive electrode; and an electrolyte injected into the case, wherein, on the basis of the total volume (CV) of an empty space inside the case according to equation 1 below, the volume (EV) of a free space according to equation 2 below is 0-45 vol%. The contents of equations 1 and 2 are the same as disclosed in the specification. The electrochemical device can solve a problem of accelerating the capacity degradation, causing by reducing the reaction area on surfaces of the electrodes and further increasing the side reaction, through the gas generated from an oxidation reaction of the electrolyte due to a high voltage.

Description

technical field [0001] This application claims priority from Korean Patent Application No. 10-2014-0191038 filed in Korea on December 26, 2014, the disclosure of which is incorporated herein by reference. The present disclosure relates to an electrochemical device, and more specifically, the present disclosure provides a method capable of solving the problem that the gas generated by the oxidation reaction of the electrolyte solution due to high voltage reduces the reaction area of ​​the electrode surface, and further increases Side reactions, which accelerate capacity degradation problems in electrochemical devices. Background technique [0002] Lithium secondary batteries (for example, lithium ion batteries), nickel hydrogen batteries, and other secondary batteries are gaining importance as power sources that can be mounted on vehicles or as power sources for portable terminals such as notebooks. In particular, a lithium secondary battery that can have high energy density...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/02H01M2/34H01M10/04H01M10/052H01M50/107H01M50/574
CPCH01M10/052H01M10/058H01M50/107H01M50/574H01M4/505H01M4/525H01M4/587H01M10/0525H01M10/44H01M2200/20Y02E60/10H01M50/578Y02P70/50
Inventor 宋周容
Owner LG CHEM LTD
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