Hitachi Maxell, Limited

Masayuki Yoshiya

Masayuki Yamada

Akira Inaba

Naokage Tanaka

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 I/Iof a peak intensity Iat 510 cmderived from Si to a peak intensity Iat 1343 cmderived 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&#xb0; when the crystallite size of an Si phase contained in the core material is measured by X-ray diffractometry using CuK&#x3b1; radiation.

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Ibaraki, Japan

Masayuki Yoshiya