Negative electrode for secondary battery, and secondary battery

A negative electrode for a secondary battery, the negative electrode comprising:

• a negative electrode active material layer, wherein the negative electrode active material layer includes a negative electrode current collector material, a first negative electrode active material, and a second negative electrode active material,
• wherein the first negative electrode active material includes a silicon-containing material,
• wherein the second negative electrode active material includes a carbon-containing material, and
• wherein the negative electrode current collector material is a plurality of single-walled carbon nanotubes, the plurality of single-walled carbon nanotubes are entangled to define an entangled single-walled carbon nanotubes structure, wherein the entangled single-walled carbon nanotubes structure having a maximum outer diameter of 5 nanometers or less, and
• a peak is detected in a range of Raman shift of 165 cm−1 or greater and 185 cm−1 or less in five-point average differentiation of a Raman spectrum of the negative electrode active material layer in a radial breathing mode, the Raman spectrum being measured by Raman spectroscopy.

A secondary battery comprising:

• a positive electrode;
• a negative electrode including a negative electrode active material layer,
• wherein the negative electrode active material layer includes a negative electrode current collector material, a first negative electrode active material, and a second negative electrode active material, wherein the first negative electrode active material includes a silicon-containing material to provide a dispersed negative electrode material to which a thickening agent is added thereby providing a solid content of the dispersed negative electrode material of 35 wt % to 50 wt %, wherein the second negative electrode active material includes a carbon-containing material, wherein the negative electrode current collector material is a plurality of single-walled carbon nanotubes that are dispersed in the dispersed negative electrode material, wherein the plurality of single-walled carbon nanotubes are entangled to define an single-walled entangled carbon nanotubes structure, and wherein the entangled single-walled carbon nanotubes structure having a maximum outer diameter of 5 nanometers or less,
• a peak is detected in a range of Raman shift of 165 cm−1 or greater and 185 cm−1 or less in five-point average differentiation of a Raman spectrum of the negative electrode active material layer in a radial breathing mode, the Raman spectrum being measured by Raman spectroscopy;
• and
• an electrolytic solution.