Non-aqueous secondary battery

摘要

The non-aqueous secondary battery of the present invention includes a positive electrode, a negative electrode, a non-aqueous electrolyte, and a separator, the negative electrode contains a negative electrode active material containing a graphitic carbon material and a composite in which a carbon coating layer is formed on a surface of a core material containing Si and O as constituent elements, the composite has a carbon content of 10 to 30 mass %, the composite has an intensity ratio I510/I1343 of a peak intensity I510 at 510 cm−1 derived from Si to a peak intensity I1343 at 1343 cm−1 derived from carbon of 0.25 or less when a Raman spectrum of the composite is measured at a laser wavelength of 532 nm, and the half-width of the (111) diffraction peak of Si is less than 3.0° when the crystallite size of an Si phase contained in the core material is measured by X-ray diffractometry using CuKα radiation.

主权项

1. A non-aqueous secondary battery comprising a positive electrode, a negative electrode, a non-aqueous electrolyte, and a separator,
the negative electrode comprising a negative electrode active material comprising a graphitic carbon material and a composite in which a carbon coating layer is formed on a surface of a core material comprising Si and O as constituent elements, the composite having a carbon content of 10 to 30 mass %, the composite having an intensity ratio I510/I1343 of a peak intensity I510 at 510 cm−1 derived from Si to a peak intensity I1343 at 1343 cm−1 derived from carbon of 0.25 or less when a Raman spectrum of the composite is measured at a laser wavelength of 532 nm, a half-width of a (111) diffraction peak of Si being less than 3.0° when a crystallite size of an Si phase contained in the core material is measured by X-ray diffractometry using CuKα radiation, and the positive electrode comprising a positive electrode active material comprising an Li-containing transition metal oxide represented by LiaCobM11-bO2 where M1 is at least one metal element selected from the group consisting of Mg, Mn, Fe, Cu, Zn, Al, Ti, Ge, and Cr, 0≦a≦1.1, and 0