Negative electrode material for non-aqueous electrolyte secondary batteries, manufacturing method therefor, and lithium-ion secondary batteries

Patent metadata

Field	Value
Publication number	US-9287561-B2
Application number	US-89624910-A
Country	US
Kind code	B2
Filing date	Oct 1, 2010
Priority date	Oct 28, 2009
Publication date	Mar 15, 2016
Grant date	Mar 15, 2016

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.

First claim

What is claimed is:

1. 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.

2. The negative electrode material for non-aqueous electrolyte secondary batteries according to claim 1 , wherein the metal oxide coating further comprises, as a constitutional element, at least one element selected from the group consisting of zirconium (Zr), hafnium (Hf), vanadium (V), niobium (Nb), tantalum (Ta), chromium (Cr), molybdenum (Mo), tungsten (W), manganese (Mn), iron (Fe), ruthenium (Ru), cobalt (Co), rhodium (Rh), iridium (Ir), nickel (Ni), palladium (Pd), cerium (Ce), indium (In), germanium (Ge), tin (Sn), bismuth (Bi), antimony (Sb), cadmium (Cd), copper (Cu), and silver (Ag).

3. A lithium-ion secondary battery comprising at least a positive electrode, a negative electrode, and a lithium-ion conducting non-aqueous electrolyte, the battery comprising, as the negative electrode, the negative electrode material for non-aqueous electrolyte secondary batteries according to claim 1 .

Assignees

• Watanabe Koichiro
• Nakanishi Tetsuo
• Taniguchi Kazuyuki
• Shinetsu Chemical Co

Inventors

• Watanabe Koichiro
• Nakanishi Tetsuo
• Taniguchi Kazuyuki

Classifications

• H01M4/38 Primary

  of elements or alloys · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M2220/30

  Batteries in portable systems, e.g. mobile phone, laptop · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title