Secondary battery-use active material, secondary battery, and electronic apparatus

A secondary battery-use active material comprising:

• a core section capable of inserting and extracting lithium ions;
• and
• a covering section provided in at least part of a surface of the core section and being a low-crystalline or a noncrystalline, wherein
• the core section includes Si and O as constituent elements, and an atom ratio x (O/Si) of O with respect to Si satisfies 0≦x<0.5,
• the covering section includes Si and O as constituent elements, and an atom ratio y (O/Si) of O with respect to Si satisfies 0.5≦y≦1.8, and
• the covering section has voids, and a carbon-containing material is provided in at least part of the voids.

An electronic apparatus comprising a secondary battery as an electric power supply source, wherein

• the secondary battery includes a cathode, an anode including an active material, and an electrolytic solution,
• the active material includes a core section and a covering section, the core section being capable of inserting and extracting lithium ions, and the covering section being provided in at least part of a surface of the core section and being a low-crystalline or a noncrystalline,
• the core section includes Si and O as constituent elements, and an atom ratio x (O/Si) of O with respect to Si satisfies 0≦x<0.5,
• the covering section includes Si and O as constituent elements, and an atom ratio y (O/Si) of O with respect to Si satisfies 0.5≦y≦1.8, and
• the covering section has voids, and a carbon-containing material is provided in at least part of the voids.