| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery capable of preventing swelling or deformation caused by charging and discharging. <P>SOLUTION: A wound-around body 1 made by winding a laminate 2 at least containing a cathode, an anode having an anode active material layer containing Si or Sn, and a separator intercalated between these with a core material 3 at the center. In a second-round and further winding, the laminate 2 is wound around so as a distance between the anodes in a radius direction of the wound-around body 1 to satisfy the following formula (1). As to the first winding of the wound-around body 1, the laminate 2 is preferred to be wound so as not to bring forth a gap between the laminate 2 and the core material 3. Here, the formula (1) is: a distance between the anodes=a thickness of the cathode+a thickness of the separator+a thickness of the anode+a thickness of the anode active material layer×0.5 to 3.0. <P>COPYRIGHT: (C)2008,JPO&INPIT |
