NEGATIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERIES

摘要

This negative electrode active material for nonaqueous electrolyte secondary batteries contains a silicon solid solution in which one or more elements selected from among group 3 semimetal elements and metal elements, group 4 semimetal elements and metal elements (excluding silicon) and group 5 non-metallic elements and semimetal elements are solid-solved in silicon. The elements solid-solved in silicon are present more at the crystal grain boundaries than in the inner portions of the crystal grains in the silicon solid solution.

主权项

1. A negative electrode active material for nonaqueous secondary batteries, comprising a silicon solid solution having one or more than one element selected from a group 3 semimetal or metal element, a group 4 semimetal or metal element except silicon, and a group 5 nonmetal or semimetal element incorporated in silicon, the one or more than one element being present more on the crystal grain boundaries of the silicon solid solution than inside the crystal grains.