Negative electrode material for non-aqueous electrolyte secondary batteries, manufacturing method therefor, and lithium-ion secondary batteries
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsKoichiro Watanabe, Tetsuo Nakanishi, Kazuyuki Taniguchi
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Abstract
The present invention is a negative electrode material for non-aqueous electrolyte secondary batteries, comprising at least: particles wherein silicon nanoparticles are dispersed in silicon oxide (silicon oxide particles); and a metal oxide coating formed on a surface of the silicon oxide particles. As a result, there is provided a negative electrode material for non-aqueous electrolyte secondary batteries that enables the production of a negative electrode suitable for lithium-ion secondary batteries and the like that provides improved safety and cycle performance over conventional negative electrode materials.
Claims3
A negative electrode material for non-aqueous electrolyte secondary batteries, comprising:
- silicon oxide particles comprising silicon oxide with silicon nanoparticles dispersed within the silicon oxide;
- a metal oxide coating formed on a surface of the silicon oxide particles;
- and
- a carbon coating formed on a surface of the metal oxide coating,
- wherein the metal oxide coating comprises an oxide of one or two elements selected from the group consisting of magnesium (Mg), and aluminum (Al), and
- wherein the metal oxide coating formed on the surface of the silicon oxide particles is present in a proportion of 0.1% by mass or more and 30% by mass or less based on the total mass of the silicon oxide particles.
Dependencies are inferred from the claim text.