摘要 |
<P>PROBLEM TO BE SOLVED: To provide a negative electrode capable of improving a cycle characteristic by reducing structural disorder caused by charge and discharge of a negative electrode active material layer, and reactivity with an electrolyte; and to provide a battery using it. <P>SOLUTION: The negative electrode active material layer 12 contains at least one kind among a group comprising a single body, an alloy and a compound of an element, for instance, Si or Ge capable of forming an alloy with Li. A thin film layer 13 containing a material having superelasticity or a shape-memory effect is formed on the active material layer 12. For the material having superelasticity or the shape-memory effect, a Ni-Ti alloy or an alloy containing Ni, Ti and other element is preferable. <P>COPYRIGHT: (C)2005,JPO&NCIPI |