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US 2026/0094802 A1Published application
Lithium Secondary Battery Including Negative Electrode Having Improved Resistance to Degradation, and Method for Manufacturing Same
AssigneeSK On Co., Ltd.
InventorsEunjun Park, Joon Sup Kim, Gwi Ok Park, Jeehee Lee
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Abstract
The present invention relates to a lithium secondary battery having excellent lifespan characteristics by including a negative electrode improved in protection against degradation due to volume expansion of a negative electrode active material at the time of charging and discharging the lithium secondary battery, and a method of manufacturing the same.
Claims17
A lithium secondary battery comprising:
- a negative electrode including a negative electrode current collector portion and a negative electrode tab portion protruding from a part of one surface of the negative electrode current collector portion,
- wherein the negative electrode current collector portion comprises a coated portion that is coated with a negative electrode active material and an uncoated portion that is not coated with the negative electrode active material,
- wherein when the negative electrode is viewed from above, the uncoated portion is positioned at a point in contact with at least one end point of a boundary line between the negative electrode current collector portion and the negative electrode tab portion, and
- wherein a content of silicon in the negative electrode active material is 5 wt % or more with respect to 100 wt % of the total negative electrode active material.
1 more element
A method of manufacturing a lithium secondary battery, comprising:
- preparing a negative electrode including a negative electrode current collector portion partially coated with a negative electrode active material and a negative electrode tab portion protruding from a part of one surface of the negative electrode current collector portion,
- wherein the preparing of the negative electrode comprises:
- masking a point in contact with at least one end point of a boundary line between the negative electrode current collector portion and the negative electrode tab portion when the negative electrode is viewed from above;
- coating and drying a negative electrode active material slurry on the negative electrode current collector portion;
- and
- removing the masking,
- wherein in the coating and drying of the negative electrode active material slurry, a content of silicon with respect to 100 wt % of the total negative electrode active material in the negative electrode active material slurry is 5 wt %.
4 more elements
Dependencies are inferred from the claim text.