| 摘要 |
PURPOSE:To improve the charge recovery performance after over-discharging a battery and leaving it intact by covering a lead-tin alloy added with the specific ratio quantity of tin to high-purity lead on part of the surface of a lattice body made of a lead-calcium-tin alloy. CONSTITUTION:A Pb-Sb alloy added with Sn 0.01-0.2% to Pb with the purity of 99.99% or above is covered on part of the surface of a lattice body for positive electrode made of a Pb-Ca-Sn alloy. As a result, a resistance body PbOx generated on the interface between the lattice body and an active material can be made thin in thickness. When the addition of Sn is 0.01% or below, the adding effect has much dispersion, the adding effect is not so remarkable at 0.2-1.9%, and the efficiency of the addition is bad at 1.9% or above. The charge recovery performance after a battery is over-discharged and left intact can be thereby improved while the addition of Sn is kept to a trace quantity. |
