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    • 55. 发明申请
    • NEGATIVE ELECTRODE FOR NON-AQUEOUS SECONDARY BATTERY, AND A NON-AQUEOUS SECONDARY BATTERY
    • 非水性二次电池负极和非水性二次电池
    • US20130136988A1
    • 2013-05-30
    • US13814069
    • 2011-08-03
    • Naokage TanakaAkira InabaKeiichiro UenaeMasayuki YamadaKazunobu Matsumoto
    • Naokage TanakaAkira InabaKeiichiro UenaeMasayuki YamadaKazunobu Matsumoto
    • H01M4/131H01M4/134H01M4/133
    • H01M4/131H01M4/133H01M4/134H01M4/364H01M4/38H01M4/485H01M4/525H01M4/587H01M10/052Y02E60/122
    • [Objectives] The present invention provides a non-aqueous secondary battery in which a material containing Si and O as constituent elements is used in a negative electrode. The present invention provides a non-aqueous secondary battery having good charge discharge cycle characteristics, and suppressing the battery swelling associated with the charge and the discharge. Also, the present invention relates to a negative electrode that can provide the non-aqueous secondary battery. [Solution] The negative electrode includes a negative electrode active material, including a composite of a material containing Si and O as constitution elements (atom ratio x of O to Si is 0.5≦x≦1.5) in combination with a carbon material, and graphite. The graphite has an average particle diameter dg(μm) of 4 to 20 μm. The material containing Si and O as constitution elements has an average particle diameter ds(μm) of 1 μm or more. The ratio ds/dg (i.e., ds to dg) is 0.05 to 1. The material containing Si and O as constitution elements has a crystallite diameter of 50 nm or less, the crystallite diameter is calculated from a half width at a (220) plane of Si obtained by an X-ray diffraction method, using Scherrer Formula. In 100 mass % of the composite of the material containing Si and O as constitution elements, and the carbon material, a ratio of the material containing Si and O as constitution elements is 70 to 95 mass %.
    • [目的]本发明提供一种非水二次电池,其中在负极中使用含有Si和O作为构成元素的材料。 本发明提供一种具有良好的充电放电循环特性并抑制与充电和放电相关的电池膨胀的非水二次电池。 另外,本发明涉及能够提供非水二次电池的负极。 [解决方案]负极包括负极活性材料,其包含与碳材料组合的作为构成元素(O与Si的原子比x为0.5≤x≤1.5)的包含Si和O的材料的复合材料,以及石墨 。 该石墨的平均粒径dg(mum)为4〜20μm。 作为构成元素的含有Si和O的材料的平均粒径ds(mum)为1μm以上。 比率ds / dg(即ds至dg)为0.05〜1。作为构成元素的含有Si和O的材料的微晶直径为50nm以下,微晶直径由(220)的半值宽度计算, 使用Scherrer公式通过X射线衍射法获得的Si平面。 在作为构成元素的含有Si和O的材料的复合材料的100质量%中,作为构成要素的含有Si和O的材料的比例为70〜95质量%。