Battery, negative electrode active material, and electric tool
AssigneeSony Corporation
InventorsTakakazu HIROSE, Kenichi KAWASE, Takashi FUJINAGA, Isao KOIZUMI, Toshio NISHI
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Abstract
A battery is provided including a positive electrode; a negative electrode including a first negative electrode active material; and an electrolytic solution, wherein the first negative electrode active material includes a core portion having a core portion surface, wherein the core portion has a median diameter of 0.3 μm to 20 μm, and a covering portion that covers at least part of the core portion surface, wherein the covering portion comprises at least Si, O and at least of one element M1 selected from Li, carbon (C), Mg, Al, Ca, Ti, Cr, Mn, Fe, Co, Ni, Cu, Ge, Zr, Mo, Ag, Sn, Ba, W, Ta, Na, and K.
Claims22
A battery comprising:
- a positive electrode;
- a negative electrode including a first negative electrode active material;
- and
- an electrolytic solution,
- wherein the first negative electrode active material includes:
- a core portion having a core portion surface, wherein the core portion has a median diameter of 0.3 μm to 20 μm, and
- a covering portion that covers at least part of the core portion surface,
- wherein the covering portion comprises at least Si, O and at least of one element M1 selected from Li, carbon (C), Mg, Al, Ca, Ti, Cr, Mn, Fe, Co, Ni, Cu, Ge, Zr, Mo, Ag, Sn, Ba, W, Ta, Na, and K.
An electric tool comprising:
- a battery including a positive electrode, a negative electrode including a negative electrode active material, and an electrolytic solution;
- and
- a moving part configured to be powered by the battery,
- wherein the negative electrode active material includes:
- a core portion having a core portion surface, wherein the core portion has a median diameter of 0.3 μm to 20 μm, and
- a covering portion that covers at least part of the core portion surface,
- wherein the covering portion comprises at least Si, O and at least of one element M1 selected from Li, carbon (C), Mg, Al, Ca, Ti, Cr, Mn, Fe, Co, Ni, Cu, Ge, Zr, Mo, Ag, Sn, Ba, W, Ta, Na, and K.
A negative electrode active material comprising:
- a core portion having a core portion surface, wherein the core portion has a median diameter of 0.3 μm to 20 μm, and
- a covering portion that covers at least a part of the core portion surface,
- wherein the covering portion comprises at least Si and O and at least of one element M1 selected from Li, carbon (C), Mg, Al, Ca, Ti, Cr, Mn, Fe, Co, Ni, Cu, Ge, Zr, Mo, Ag, Sn, Ba, W, Ta, Na, and K.
Dependencies are inferred from the claim text.