To provide a cell having improved cycle property by forming a stable and rigid film on the surface of a negative electrode active material layer.
A positive electrode 12 and a negative electrode 14 are laid in layer via a separator 15. The negative electrode 14 has a negative electrode collector 14A and a negative active material layer 14B. The negative electrode active material layer 14B contains Si or its alloy and is formed by the gas phase method, liquid phase method or sintering method, and it is preferable that at least part of the interface to the negative electrode collector 14A is alloyed with the negative electrode collector 14A. Electrolyte is impregnated into the separator 15. The electrolyte contains cyclic carbonic acid ester having unsaturated bonding such as vinylene carbonate or vinyl ethylene carbonate as solvent. Therefore, a rigid and stable film is formed on the surface of the negative electrode active material layer 14B and decomposition of the electrolyte is restrained at the negative electrode 14.
TAKADA TOMOO
MIYAKI YUKIO
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