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    • 3. 发明申请
    • NEGATIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERIES
    • 用于非电解电解质二次电池的负极电极活性材料
    • US20160336586A1
    • 2016-11-17
    • US15112793
    • 2015-01-22
    • SANYO ELECTRIC CO., LTD.
    • Kouhei TudukiAyano ToyodaAtsushi FukuiTaizou Sunano
    • H01M4/134H01M4/62H01M4/38H01M10/0525H01M4/36
    • H01M4/134H01M4/366H01M4/386H01M4/62H01M10/0525H01M2004/027
    • Provided is a negative electrode active material, containing at least silicon, for nonaqueous electrolyte secondary batteries. Since the negative electrode active material contains silicon, the negative electrode active material has high capacity and excellent cycle characteristics. A negative electrode active material for nonaqueous electrolyte secondary batteries contains at least silicon. At least, one portion of the surface of each of primary particles containing silicon is covered with an inert phase made of a silicon compound with a silicon oxidation number higher than that of the silicon, a metal-silicon alloy, or metal. The primary particles containing silicon may form secondary particles. The silicon compound with a silicon oxidation number higher than that of silicon is preferably Li2Si2O5, Li2SiO3, or Li4SiO4. Furthermore, the metal-silicon alloy is preferably FeSi and the metal is preferably Ti. Furthermore, the crystallite size of silicon is 500 Å or less.
    • 提供一种负极活性物质,至少含有硅,用于非水电解质二次电池。 由于负极活性物质含有硅,因此负极活性物质具有高容量和优异的循环特性。 非水电解质二次电池用负极活性物质至少含有硅。 至少有一部分含有硅的一次粒子的表面被硅氧化数高于硅,金属硅合金或金属的硅化合物制成的惰性相覆盖。 含硅的初级颗粒可以形成二次颗粒。 硅氧化数高于硅的硅化合物优选为Li 2 Si 2 O 5,Li 2 SiO 3或Li 4 SiO 4。 此外,金属 - 硅合金优选为FeSi,金属优选为Ti。 此外,硅的微晶尺寸为500以下。