Battery electrode analysis method

1. A method for analyzing an electrode for a battery, comprising:

preparing an electrode for a secondary battery comprising an electrode active material, a conductive material, and pores;

preparing an electrode cross-section sample by irradiating the electrode for a secondary battery with an ion beam from an ion milling apparatus;

obtaining resistance value data of the electrode active material, the conductive material and the pores in the electrode cross-section sample by scanning spreading resistance microscopy;

obtaining a logarithmic scale image by changing the resistance value data to a logarithmic scale;

obtaining a linear scale image by changing the resistance value data to a linear scale; and

obtaining a merged image by merging the logarithmic scale image with the linear scale image.

2. The method of claim 1 , further comprising distinguishing between and quantifying a region of the electrode active material, a region of the conductive material and a region of the pores in the electrode cross-section sample, by analyzing the merged image.

3. The method of claim 1 , further comprising, before the preparing the electrode cross-section sample, filling pores in the electrode for a secondary battery with an epoxy group-containing polymer by impregnating the electrode for a secondary battery with the epoxy group-containing polymer.

4. The method of claim 3 , further comprising measuring a resistance value of the epoxy group-containing polymer filling the pores of the electrode cross-section sample.

5. The method of claim 1 , wherein the ion beam is an argon ion beam.

6. The method of claim 1 , wherein an ion beam current of the ion milling apparatus is 100 μA to 250 μA.