NEGATIVE ELECTRODE ACTIVE MATERIAL, NEGATIVE ELECTRODE ARRANGED BY ADOPTING THE SAME, AND LITHIUM BATTERY

PROBLEM TO BE SOLVED: To provide a negative electrode active material, a negative electrode arranged by adopting the negative electrode active material, and a lithium battery.SOLUTION: The present invention relates to a negative electrode active material, a negative electrode arranged by adopting the negative electrode active material, and a lithium battery. The negative electrode active material comprises a silicon-based alloy; the silicon-based alloy includes a Si single phase, an FeSialpha phase and an FeSibeta phase. The ratio of the diffraction intensity a diffraction peak coming from the FeSibeta phase to the diffraction intensity of a diffraction peak coming from the FeSialpha phase is 0.1 or more. Thus, the life characteristic of a lithium battery in which the negative electrode active material is adopted can be improved.SELECTED DRAWING: Figure 7 【課題】負極活物質、それを採用した負極、及びリチウム電池を提供する。【解決手段】負極活物質、それを採用した負極、及びリチウム電池に関し、該負極活物質は、シリコン系合金を含み、該シリコン系合金は、Ｓｉ単一相、ＦｅＳｉ２アルファ相及びＦｅＳｉ２ベータ相を含むが、該ＦｅＳｉ２アルファ相による回折ピークの回折強度に対する、該ＦｅＳｉ２ベータ相による回折ピークの回折強度の比が０．１以上である。これにより、該負極活物質を採用したリチウム電池の寿命特性を改善できる。【選択図】図７