| 摘要 |
Provided are an electrode assembly with improved active material coatings of electrodes, by which an increase in thickness or distortion in shape can be prevented even after repeated charge and discharge cycling, and a lithium ion cell having the electrode assembly. The electrode assembly includes a negative electrode formed by winding a stacked structure having a negative electrode starting portion made of a current collector from which the negative electrode tab extends at an upper end of the negative electrode, and a negative electrode coated portion extending from the negative electrode starting portion and having a negative electrode active material coated on at least one plane of the current collector, a positive electrode formed by winding a stacked structure having a positive electrode starting portion made of a current collector from which a positive electrode tab, spaced a predetermined distance apart from a negative electrode tab, extends at an upper end of the positive electrode, and a positive electrode coated portion extending from the positive electrode starting portion and having a positive electrode active material coated on at least one plane of the current collector, the positive electrode coated portion being spaced a predetermined distance apart from the negative electrode, and a separator interposed between the positive and negative electrodes and providing electrical insulation.
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