(US5419986-A)      A rechargeable battery electrode is mfd. by (a) adding a nitrate component to a soln. contg. 50-150g of Mn nitrate in 10-40 ml water, (b) heating the mixt. to evaporate all the water, (c) continuing heating to 200-300 deg. C to decompose the nitrates, and further continuing heating until visible vapours generated by the decomposition cease, and (d) maintaining the obtd. Mn oxide cpd. at 200-300 deg. C for 0.5-2.5h.    Pref. the nitrate component is Bi nitrate, and the decomposition prod. has formula MnO2.xBi2O3, where x = 0.002-0.5.    USE/ADVANTAGE -   As the anode (claimed). Suitable for commercial scale prodn. Simple and efficient mfr. Excellent rechargeability, retaining its capacity over many charge-discharge cycles.    (EP723708-A1)       In the method for mfr. of an electrode material contg. manganese oxide: (a) 50-150 g. manganese nitrate is added to 10-40 ml. H2 O; (b) a nitrate is added; (c) the mixt. is heated to evaporate all H2O; and (d) heating is continued at 200-300C to decompose the nitrates until emission of visible vapour ceases and a manganese oxide contg. cpd. is formed as rechargeable battery electrode material.     Also claimed is a rechargeable battery cell (1) contg. an anode (4) with a surrounding cathode (5) comprising MnO2 .xBi2 O3(x is 0.02-0.5) rechargeable material, binder and reinforcer, an electrode separator (6) and current collector (3).     Nitrate in (b) is bismuth nitrate. Cpd. formed in stage (d) is MnO2 .xBi2 O3, where x is 0.02-0.5. Material also contains tetrafluoroethylene as a binder, and graphite, Ni-plated Fe, metal fibres, etc., as a reinforcer.    USE -   Rechargeable material is a positive electrode for battery cells or usable in small amts. with commercially available material to impart rechargeable properties. Batteries have utility in vehicles, electronic goods, space satellites, etc..    ADVANTAGE -   Material is highly rechargeable, low cost, retains capacity over many charge/discharge cycles, and can be prepd. on a large scale. Material evolves no gas and has good density and conductivity.    (JP9503882-W)       In the method for mfr. of an electrode material contg. manganese oxide: (a) 50-150 g. manganese nitrate is added to 10-40 ml. H2 O; (b) a nitrate is added; (c) the mixt. is heated to evaporate all H2O; and (d) heating is continued at 200-300C to decompose the nitrates until emission of visible vapour ceases and a manganese oxide contg. cpd. is formed as rechargeable battery electrode material.     Also claimed is a rechargeable battery cell (1) contg. an anode (4) with a surrounding cathode (5) comprising MnO2 .xBi2 O3(x is 0.02-0.5) rechargeable material, binder and reinforcer, an electrode separator (6) and current collector (3).     Nitrate in (b) is bismuth nitrate. Cpd. formed in stage (d) is MnO2 .xBi2 O3, where x is 0.02-0.5. Material also contains tetrafluoroethylene as a binder, and graphite, Ni-plated Fe, metal fibres, etc., as a reinforcer.    USE -   Rechargeable material is a positive electrode for battery cells or usable in small amts. with commercially available material to impart rechargeable properties. Batteries have utility in vehicles, electronic goods, space satellites, etc..    ADVANTAGE -   Material is highly rechargeable, low cost, retains capacity over many charge/discharge cycles, and can be prepd. on a large scale. Material evolves no gas and has good density and conductivity.    (EP723708-B1)       In the method for mfr. of an electrode material contg. manganese oxide: (a) 50-150 g. manganese nitrate is added to 10-40 ml. H2 O; (b) a nitrate is added; (c) the mixt. is heated to evaporate all H2O; and (d) heating is continued at 200-300C to decompose the nitrates until emission of visible vapour ceases and a manganese oxide contg. cpd. is formed as rechargeable battery electrode material.     Also claimed is a rechargeable battery cell (1) contg. an anode (4) with a surrounding cathode (5) comprising MnO2 .xBi2 O3(x is 0.02-0.5) rechargeable material, binder and reinforcer, an electrode separator (6) and current collector (3).     Nitrate in (b) is bismuth nitrate. Cpd. formed in stage (d) is MnO2 .xBi2 O3, where x is 0.02-0.5. Material also contains tetrafluoroethylene as a binder, and graphite, Ni-plated Fe, metal fibres, etc., as a reinforcer.    USE -   Rechargeable material is a positive electrode for battery cells or usable in small amts. with commercially available material to impart rechargeable properties. Batteries have utility in vehicles, electronic goods, space satellites, etc..    ADVANTAGE -   Material is highly rechargeable, low cost, retains capacity over many charge/discharge cycles, and can be prepd. on a large scale. Material evolves no gas and has good density and conductivity.