公开(公告)号：EP2618407A1

公开(公告)日：2013-07-24

申请号：EP11832271.8

申请日：2011-10-07

Applicant: OSAKA Titanium Technologies Co., Ltd.

Inventor： YASUDA, Kouji ,  FUJITA, Takehisa ,  KIZAKI, Shingo ,  SHIMOSAKI, Shinji

IPC: H01M4/48 ,  H01G9/058 ,  H01M4/36

CPC classification number: H01M4/386 ,  H01G11/24 ,  H01G11/50 ,  H01M4/366 ,  H01M4/483 ,  H01M4/5825 ,  H01M4/625 ,  H01M10/0525 ,  H01M2004/021 ,  Y02E60/13

Abstract: In a lithium ion secondary battery using a negative electrode material powder including a lower silicon oxide powder as a negative electrode material, a charge electric potential at 0.45-1.0 V relative to a Li reference upon initial charging results in a lithium ion secondary battery having a large discharge capacity with excellent cycle characteristics, which can be durable in practical use. On this occasion, the charge electric potential being 0.45-1.0 V relative to the Li reference upon initial charging means that an electric potential plateau caused by the generation of Li-silicate is observed, and the Li-silicate is uniformly generated in the negative electrode material. The negative electrode material powder according to the present invention having the charge electric potential of 0.45-1.0 V relative to the Li reference upon initial charging prevents the negative electrode material from being finely torn apart upon charging/discharging which results in cycle characteristic degradation, and excellent cycle characteristics are obtained. It is preferable for the negative electrode material powder according to the present invention to have an electrically conductive carbon film on the surface, and for the ratio of the electrically conductive carbon film to the surface of the powder to be 0.2-10 mass %.

Abstract translation: 在使用负极材料粉末包括下部的氧化硅粉末作为负极材料，在0.45-1.0 V相的电荷电位在锂离子具有二次电池在初始充电的结果的锂基准的锂离子二次电池 放电容量大，具有优异的循环特性，可在实际使用耐用。 在这种情况下，充电电势是相对于在初始充电bedeutet锂参考0.45-1.0 V，DASS在由硅酸锂的生成引起的电位高原-观察到的，和硅酸锂在负电极均匀地产生 材料。 的负极材料粉末gemäß到本发明的具有相对于在初始充电时的锂参考0.45-1.0 V的电荷电位被精细地撕开时的充电/放电，这导致劣化的循环特性，防止负电极材料，以及 优异的循环特性得到。 优选的是，负极材料粉末gemäß到本发明的具有在导电的碳薄膜的表面，并为导电性碳电影到粉末的表面的比例为0.2〜10质量％。