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Bipolar lithium secondary battery

A lithium secondary battery and positive electrode technology, applied in the field of bipolar lithium secondary batteries, can solve the problems of enlarged bipolar electrode gaps, difficulty in manufacturing gaskets, and reduced volume output, so as to reduce weight and volume and prevent self-discharge and bypass current generation, the effect of high energy density

Pending Publication Date: 2022-01-28
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Generally, a gasket is used for sealing to prevent leakage of the electrolyte, but there are problems that it is difficult to manufacture a gasket having a thickness of 1 mm or less, and if the thickness of the gasket is too large, there is a gap between bipolar electrodes that becomes large, and Hence the problem of reduced output relative to volume
[0009] Furthermore, in bipolar electrodes, when electrolyte solutions adjacent to electrodes having different polarities move and mix, self-discharge and bypass current may occur, and therefore, development of technology capable of preventing such problems is required

Method used

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Examples

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Embodiment 1

[0091] A PE film (polyethylene, thickness 20 μm) having a porosity of 20% as a non-porous film was attached as a polymer film to the edge of a Cu foil (LS Cable & System company, thickness 20 μm) as a current collector.

[0092] After that, positive and negative electrodes were formed on the upper and lower surfaces of the current collector in the following manner.

[0093] To form the positive electrode, a positive electrode slurry having a concentration of 20% (based on the concentration of solid components) was prepared by mixing the sulfur-carbon composite, the conductive material, and the binder in a weight ratio of 90:5:5 and dissolving them in water material. The positive electrode slurry was coated on the top surface of the current collector using a bar coating method, and then dried at 50° C. for 2 hours to form a positive electrode. The dried positive electrode was rolled to have a porosity of 65% using a roll press. At this time, the sulfur-carbon composite was pr...

experiment example 1

[0104] Experimental example 1: Analysis of the effect of improving the performance of lithium-sulfur secondary batteries

[0105] Experiments were conducted on the performance of the lithium-sulfur secondary batteries prepared in Example 1 and Comparative Examples 1 and 2, respectively. Example 1 is a bipolar lithium-sulfur secondary battery comprising a current collector with a polymer film attached to its edge (formed by connecting two unit cells in series inside the battery with a current collector with a polymer film attached to its edge form), Comparative Example 1 is a lithium-sulfur secondary battery in which two unit cells are connected in series from the outside of the battery, and Comparative Example 2 is a bipolar lithium battery comprising a current collector without a polymer film attached as in Example 1 Sulfur secondary battery.

[0106] The lithium-sulfur secondary batteries prepared in Example 1 and Comparative Examples 1 and 2, respectively, were discharged ...

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Abstract

The present invention relates to a bipolar lithium secondary battery, and more specifically, to a bipolar lithium secondary battery comprising a bipolar unit comprising a current collector having a positive electrode and a negative electrode formed on both surfaces thereof, wherein a polymer film attached to the edge of the current collector separates an electrolyte which is adjacent to electrodes having different polarities from each other, and blocks the movement of the separated electrolyte, thereby enabling the prevention of self-discharge and the generation of a bypass current.

Description

technical field [0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2019-0070374 filed on June 14, 2019 and Korean Patent Application No. 10-2020-0070651 filed on June 11, 2020, which Korean Patent The entire content of the application is incorporated herein by reference. [0002] One aspect of the present disclosure relates to a bipolar lithium secondary battery including a bipolar unit in which electrode layers having different polarities are formed on both sides of a current collector. Background technique [0003] Unlike primary batteries that cannot be charged, secondary batteries are batteries that can be charged and discharged. Low-capacity secondary batteries are used in portable electronic devices such as mobile phones, notebook computers, or camcorders, and high-capacity secondary batteries are widely used as power sources for driving electric motors in hybrid vehicles and the like. [0004] Recently, high-capacity sec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/64H01M50/474H01M50/486H01M10/052
CPCH01M4/13H01M4/64H01M50/474H01M50/486H01M10/052H01M2220/20H01M2220/30Y02E60/10Y02P70/50H01M4/665H01M10/044H01M10/4235H01M4/382H01M4/667H01M50/477H01M50/48H01M50/491H01M10/0585H01M50/411H01M50/449H01M50/4295H01M50/417H01M4/133H01M4/134H01M10/0525
Inventor 韩承勋李载佶
Owner LG ENERGY SOLUTION LTD