Non-aqueous electrolyte secondary battery, negative electrode, negative electrode material, and preparation of Si—O—Al composite

摘要

A Si—O—Al composite comprising silicon, silicon oxide, and aluminum oxide exhibits a powder XRD spectrum in which the intensity of a signal of silicon at 28.3° is 1-9 times the intensity of a signal near 21°. A negative electrode material comprising the Si—O—Al composite is used to construct a non-aqueous electrolyte secondary battery which is improved in 1st cycle charge/discharge efficiency and cycle performance while maintaining the high battery capacity and low volume expansion upon charging of silicon oxide.

主权项

1. A negative electrode material for non-aqueous electrolyte secondary batteries, comprising:
as an active material, a Si—O—Al composite consisting of silicon in a form of silicon crystallites, silicon oxide in a form of SiOx, wherein 0