Negative electrode for lithium-ion secondary battery
OwnerSu-Min LEE, Se-Mi Park +3inventors
InventorsSu-Min LEE, Se-Mi Park, Sun-Young Shin, Yong-Ju Lee, Jung-Hyun Choi
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Abstract
Disclosed is a negative electrode for a lithium-ion secondary battery. The negative electrode includes a negative electrode active material layer, which includes a lower layer portion facing the surface of a current collector and an upper layer portion disposed on the top of the lower layer portion, wherein the upper layer portion includes graphite and silicon oxide as negative electrode active materials, the silicon oxide has a sphericity of 0.4-0.8, and the negative electrode active material layer includes a linear conductive material.
Claims26
A negative electrode for a lithium-ion secondary battery, comprising:
- a negative electrode current collector;
- and
- a negative electrode active material layer on at least one surface of the negative electrode current collector,
- wherein the negative electrode active material layer comprises:
- a lower layer portion facing the at least one surface of the negative electrode current collector and comprising a first negative electrode active material that includes a first graphite;
- and
- an upper layer portion disposed on a top of the lower layer portion and comprising a second negative electrode active material that includes a second graphite and silicon oxide, and a linear conductive material,
- wherein the silicon oxide has a sphericity, s, satisfying 0.4≤s<0.8.
A method of manufacturing a negative electrode for a lithium-ion secondary battery, the method comprising:
- preparing a lower layer slurry comprising a first negative electrode active material including a first graphite;
- preparing an upper layer slurry comprising a second negative electrode active material including a second graphite and silicon oxide, and a linear conductive material, applying the lower layer slurry to at least one surface of a negative electrode current collector;
- applying the upper layer slurry on the lower layer slurry before the lower layer slurry is dried;
- and
- drying the lower layer slurry and the upper layer slurry at the same time to form a negative electrode active material layer comprising a lower layer portion and an upper layer portion,
- wherein the silicon oxide has a sphericity, s, satisfying 0.4≤s<0.8.
Dependencies are inferred from the claim text.