Secondary battery and manufacturing method therefor
A secondary battery and electrode manufacturing technology, which is applied in the field of secondary battery and its manufacturing, can solve problems such as non-uniform coating parts, stability and battery performance degradation, and achieve the effect of preventing precipitation and improving stability and performance
Pending Publication Date: 2021-12-07
LG ENERGY SOLUTION LTD
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- Application Information
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Problems solved by technology
[0009] Here, the first electrode manufacturing process has a problem that when the first active material is applied from the coating start portion to the coating end portion of the first current collector, the first active material is excessively applied to the coating of the first current collector. On any one of the beginning part and the end part of the coating, thereby causing a non-uniform coating part, that is, a bump
As a result, there is a problem that precipitation occurs on the second electrode as the negative electrode due to the swelling, thereby deteriorating stability and battery performance.
Method used
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[0084] Three second electrodes, which are negative electrodes manufactured by the method for manufacturing a secondary battery of the present invention, were prepared, and the thickness and loading amount of the prepared second electrodes were measured. In particular, the thickness at a portion of the second electrode active material applied on each of the second electrodes and the thickness at a portion of the inactive coating portion were measured.
[0085] Here, the electrode thickness can be measured up to about 30 μm, and the loading can be measured up to about 20 mg / 25 cm 2 . Also, in the second electrode as the negative electrode, the nitrogen / phosphorus ratio can be increased from 104% to 110%, and the supply rate can be increased from 23.6% to 42.6%, compared with the first electrode as the positive electrode. This prevents lithium from being deposited on the second electrode even if a non-uniform coating portion is formed on the first electrode as the positive elect...
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Abstract
The present invention relates to a secondary battery comprising: a first electrode having a first current collector and a first electrode active material coated on at least one surface of the first current collector; and a second electrode having a second current collector and a second electrode active material coated on at least one surface of the second current collector, wherein a coating start portion and / or end portion of the first electrode active material has an irregular coating portion in which the first electrode active material is irregularly increased and coated, and a coating start portion and / or end portion of the second electrode active material has an inactive coating portion for covering the irregular coating portion.
Description
[0001] Cross References to Related Applications [0002] This application claims the benefit of priority from Korean Patent Application No. 10-2019-0040973 filed on April 8, 2019, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to a secondary battery and its manufacturing method, and more particularly, the present invention relates to a secondary battery and its manufacturing method in which the Non-uniform coating of parts resulting in plateouts. Background technique [0004] Generally, a secondary battery refers to a battery that is rechargeable and dischargeable, unlike a primary battery that is not rechargeable. Secondary batteries are widely used in high-tech electronics, such as mobile phones, notebook computers and camcorders. [0005] Such a secondary battery includes an electrode assembly in which electrodes and separators are alternately stacked and has a structure in which a plurality of e...
Claims
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IPC IPC(8): H01M10/058H01M4/13H01M10/42H01M10/052
CPCH01M4/13H01M10/052Y02E60/10Y02P70/50H01M10/4235H01M10/0587H01M10/058H01M4/0404H01M2004/021H01M50/595H01M50/471H01M4/139H01M4/366H01M10/0525H01M10/0585
Inventor 金湳源崔恩善李劭罗
Owner LG ENERGY SOLUTION LTD