Conductive silicon composite, preparation thereof, and negative electrode material for non-aqueous electrolyte secondary cell
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsMikio Aramata, Satoru Miyawaki, Susumu Ueno, Hirofumi Fukuoka, Kazuma Momii
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Abstract
A conductive silicon composite in which particles of the structure that silicon crystallites are dispersed in silicon dioxide are coated on their surfaces with carbon affords satisfactory cycle performance when used as the negative electrode material in a non-aqueous electrolyte secondary cell.
Claims18
A conductive silicon composite in which particles of the structure that crystallites of silicon having a size of 1 to 500 nm are dispersed in silicon dioxide are coated on their surfaces with carbon.
A negative electrode material for a non-aqueous electrolyte secondary cell, comprising a mixture of the conductive silicon composite of claim 1 and 1 to 60% by weight of a conductive agent, the mixture having a total carbon content of 25 to 90% by weight.
A method for preparing a conductive silicon composite in which particles of the structure that crystallites of silicon are dispersed in a silicon compound are coated on their surfaces with carbon
- comprising the steps of previously subjecting silicon oxide to chemical vapor deposition with an organic gas and/or vapor at a temperature of 500 to 1,200° C. and heat treating the resulting product in an inert gas atmosphere at 900 to 1,400° C. for disproportionation.
Dependencies are inferred from the claim text.