Patent ID: 7132197

Claim:
A battery comprising: a cathode; an anode; and an electrolyte, wherein, the anode comprises an anode mixed layer including tin-containing alloy powders, the tin-containing alloy powders are made of tin and an element except for alkali metal before first charge, said tin containing alloy powders are composed of secondary particles formed by agglomerating primary particles, the atomic composition ratio of tin in said tin-containing alloy powders is 40–50% of the alloy powders, said tin-containing alloy powders consist essentially of tin and one or more elements selected from the group consisting of aluminum (Al), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn) and molybdenum (Mo), at least one of said elements other than tin is present in an amount of at least 10 wt %, and a porosity of the anode mixed layer before the first charge is within a range from 25 vol % to 65 vol % inclusive.