Negative electrode of secondary battery, manufacturing method of negative electrode, and secondary battery with negative electrode

A manufacturing method of a negative electrode of a secondary battery, comprising:

• preparing a first paste that comprises first Si-containing particles as a negative electrode active material and comprises a dispersion medium;
• preparing a second paste that comprises second Si-containing particles as the negative electrode active material and comprises the dispersion medium;
• applying the first paste to coat a negative electrode current collector and to dry so as to form a dry layer of the first paste;
• applying the second paste to coat the dry layer of the first paste and to dry so as to form a dry layer of the second paste;
• and
• pressing the dry layer of the first paste and the dry layer of the second paste, wherein
• a Si content rate of the second Si-containing particles is smaller than a Si content rate of the first Si-containing particles,
• each of the first Si-containing particles and the second Si-containing particles comprises a LiF coating layer, and
• when, on an XPS spectrum of the first Si-containing particles measured by a X-ray photoelectron spectroscopy, a ratio of a peak intensity of an F of a LiF with respect to the peak intensity of the F of one being other than the LiF is defined as a first peak intensity ratio, and on an XPS spectrum of the second Si-containing particles, the ratio of the peak intensity of the F of the LiF with respect to the peak intensity of the F of one being other than the LiF is defined as a second peak intensity ratio, the second peak intensity ratio is smaller than the first peak intensity ratio, and a difference between the first peak intensity ratio and the second peak intensity ratio is equal to or more than 0.050 and not more than 1.00.