Composite particle including electrode material and electrode for electrochemical device including the same

1 . A negative electrode for an electrochemical device, comprising:

a current collector;

an electrode active material layer disposed on the current collector; and

a primer layer interposed between the current collector and the electrode active material layer,

wherein the electrode active material layer comprises a granule, an electrode active material, and an electrode binder, and the electrode active material and the electrode binder are not granulated or incorporated into the granule;

wherein the granule has a core portion and a surface portion, wherein the core portion comprises a granule electrode active material and the surface portion comprises a granule electrode binder, wherein the surface portion is a region from a surface of the granule to 30% of a radius toward a center of the granule, and the core portion is a region other than the surface portion,

wherein the granule electrode active material is bound to one another by the granule electrode binder,

wherein a content of the granule electrode binder in the surface portion of the granule is higher than a content of the granule electrode binder in the core portion of the granule, based on 100 wt. % of a total weight of the granule electrode active material and the granule electrode binder,

and

wherein the primer layer at least partially or totally covers a surface of the current collector, wherein the primer layer comprises a conductive material and a binder.

2 . The negative electrode according to claim 1 , wherein the electrode active material layer shows a difference of 10 wt. % or less between a content (wt. %) of the binder based on 100 wt. % of an upper portion and a content (wt. %) of the binder based on 100 wt. % of a lower portion, when the electrode active material layer is divided into the upper portion and the lower portion based on a point corresponding to 50% of a thickness of the electrode active material layer from the current collector.

3 . The negative electrode according to claim 1 , wherein the electrode active material layer shows a difference of 10 wt. % or less between a content (wt. %) of the binder in a region from the current collector to 15% of a thickness of the electrode active material layer toward an electrode surface layer portion and a content (wt. %) of the binder in a region from the electrode active material layer surface portion to 15% of the thickness of the electrode active material layer toward the current collector.

4 . An electrochemical device comprising a positive electrode, and the negative electrode of claim 1 .