NEGATIVE ELECTRODE ACTIVE MATERIAL

To provide a more suitable Fe-Si-based Si-containing negative electrode active material.SOLUTION: A negative electrode active material contains Si, FeSi2 and carbon. The FeSi2 has the ratio of the peak height of α-FeSi2 observed around 38° to the peak height of β-FeSi2 observed around 29°of 1 or les...

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Bibliographic Details
Main Author YUGAWA KAYOKO
Format Patent
LanguageEnglish
Japanese
Published 30.09.2021
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRICITY
PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY
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Summary:To provide a more suitable Fe-Si-based Si-containing negative electrode active material.SOLUTION: A negative electrode active material contains Si, FeSi2 and carbon. The FeSi2 has the ratio of the peak height of α-FeSi2 observed around 38° to the peak height of β-FeSi2 observed around 29°of 1 or less, and the half width of the peak of β-FeSi2 observed around 29° of 0.5° or more, in powder X-ray diffraction measurement using CuKα.SELECTED DRAWING: None 【課題】より好適なＦｅ−Ｓｉ系のＳｉ含有負極活物質を提供する。【解決手段】Ｓｉ、ＦｅＳｉ２及び炭素を含有し、前記ＦｅＳｉ２に関して、ＣｕＫαを用いた粉末Ｘ線回折測定において、２９°付近に観測されるβ−ＦｅＳｉ２のピーク高さに対する３８°付近に観測されるα−ＦｅＳｉ２のピーク高さの比が１以下であり、２９°付近に観測されるβ−ＦｅＳｉ２のピークの半値幅が０．５°以上である負極活物質。【選択図】なし
Bibliography:Application Number: JP20200053428