Negative electrode active material for non-aqueous electrolyte secondary battery, non-aqueous electrolyte secondary battery, method for producing negative electrode material for non-aqueous secondary battery, and method for producing non-aqueous electrolyte secondary battery

A method for producing a negative electrode material for non-aqueous electrolyte secondary batteries containing particles of negative electrode active material, including the steps of:

• preparing particles of a silicon oxide represented by a general formula SiOx 0.5≤x≤1.6;
• forming a carbon coating on at least a part of a surface of the particles of silicon oxide;
• inserting Li in the particles of silicon oxide covered with the carbon coating to modify the particles of silicon oxide;
• and
• forming a salt coating containing one or more kinds of a metal silicate containing a metal element other than a lithium element and a metal salt containing a metal element other than the lithium element on at least a part of a surface of the modified particles of silicon oxide or a surface of the above carbon coating or both of these,
• the particles of silicon oxide on which the salt coating has been formed are used to produce the negative electrode material for non-aqueous electrolyte secondary battery.