Negative electrode active material and method for manufacturing thereof, negative electrode mixture, and secondary battery

Abstract

The present disclosure provides a negative electrode active material capable of suppressing volume changes of the negative electrode active material, thereby improving cycle characteristics of a battery and/or suppressing expansion of the negative electrode active material during initial charging. The negative electrode active material 10 of the present disclosure comprises a composite material containing a carbon material 11 and a tin alloy 12. The Tin alloy is an alloy containing tin, and a metal selected from at least one of cobalt, iron, copper, and nickel. An amount of the carbon material is 10% by mass or more and 30% by mass or less, and a half-width of the tin alloy in XRD spectrum is 0.3° or more. The negative electrode active material of the present disclosure has a void 14 of 0.5% by volume or more and 40% by volume or less.

Dependencies are inferred from the claim text.