| 摘要 |
PROBLEM TO BE SOLVED: To provide a non-aqueous electrolyte secondary battery having a high capacity and excellent in cyclic characteristics. SOLUTION: Each composite particle is structured so that part or the whole of the peripheral surface of nuclear particle consisting of solid phase A is covered with another solid phase B, wherein the solid phase A contains at least tin while the phase B is a solid solution or intermetallic compound of tin as the phase A constituent element and at least one of the group II elements, transition elements, group XII and XIII elements, and group XIV elements except carbon in the periodic table excluding the above-mentioned constituent element of the phase A, and these composite particles are used as a negative electrode material, and thereto either of the oxide, sulfide, selenide and telluride of the above-mentioned metals or admixture thereof is added as a substance to make irreversible reductive reaction with lithium ions. |
