NOVELTY - A high-energy sealed maintenance-free lead-acid storage battery comprises positive electrode processed by coherency oxidation using grid alloy material and active matter, and the oxide and active matter on surface of grid alloy material are coherent. The positive electrode grid alloy material comprises lead (Pb), copper (Cux), barium (Bag), bismuth (Biy), aluminum (Alu), tin (Snq), silver (Agw) and calcium (Cat).    USE - High-energy sealed maintenance-free lead-acid storage battery used for electric vehicle (claimed).    ADVANTAGE - The battery has detecting result of more than 350 times, according to the circulating service system of national standard (350 times).    DETAILED DESCRIPTION - A high-energy sealed maintenance-free lead-acid storage battery comprises positive electrode processed by coherency oxidation using grid alloy material and active matter, and the oxide and active matter on surface of grid alloy material are coherent. The positive electrode grid alloy material comprises lead (Pb), copper (Cux), barium (Bag), bismuth (Biy), aluminum (Alu), tin (Snq), silver (Agw) and calcium (Cat); the maximum alloy element content of the alloy material is less than 2%; the alloy material is used for making positive electrode grid of battery; and the grid is processed by surface impact process and aging for 48 hours. The positive electrode active matter composite is prepared by selecting 100 kg lead powder with oxidizability of 78-82%, adding sulfuric acid solution (7.5 L), adding Aquadag (RTM: graphite based coating) (250 g), adding hydroxylamine sulfate (50 g), coating active matter composition on positive electrode grid, curing treatment for 48 hours, enabling oxide generated in curing process to be coherent, and drying for 24 hours. The negative electrode is processed by super low temperature discharging; and the negative electrode grid alloy material includes (%) lead (Pb, 0.12), calcium (Ca, 0.01), bismuth (Bi, 0.15), copper (Cu, 0.2), tin (Sn, 0.02) and aluminum (Al). The negative active matter composition is prepared by using lead powder (100 kg) with oxidizability of 75-78%, adding sulfuric acid solution (5.5 L), adding (%) barium sulfate (0.6), humic acid (0.7), alpha , beta -naphthoic acid (0.3) and acetylene black (0.2), coating active matter of component on negative electrode grid, curing treatment for 48 hours and drying matter for 24 hours. The proportion of electrolyte of battery comprises sulfuric acid solution (1.30 g/cm3) and absolute sodium sulfate (0.02%); the baffle plate of the battery comprising glass fiber diaphragm; the shell comprising acrylonitrile butadiene styrene plastic; the positive and negative electrodes are prepared according to the above formula and cured and assembled to form the high-energy sealed maintenance-free lead-acid storage battery for electric vehicle.    x=0.01-0.06;    g=0.001-0.005;    y=0.005-0.01;    u=0.03-0.06;    q=0.05-0.1;    w=0.05-0.1;and    t=0.08-0.15.