Electrode, secondary battery comprising the same, and method for manufacturing the same

An electrode, comprising:

• an electrode current collector;
• and
• an electrode layer on the electrode current collector, the electrode layer comprising an active material, a conductive material and a fluorine-containing binder,
• wherein the fluorine-containing binder is fibrilized to bind the active material and the conductive material,
• wherein a degree of crystallinity of the fluorine-containing binder is 10% or less,
• wherein the fluorine-containing binder is polytetrafluoroethylene (PTFE),
• wherein the electrode layer has a quantified binder ratio (QBR) of 1.1 or less, and
• wherein the QBR is defined by the following equation:
• QBR
• =
• Bs
• /
• Bf
• ,
• wherein Bs denotes an average fluorine content in an electrode layer surface region within 15% of a total thickness of the electrode layer from an outermost surface of the electrode layer, and Bf denotes an average fluorine content in an electrode layer bottom region within 15% of the total thickness of the electrode layer from an interface between the electrode layer and the current collector.