LITHIUM SECONDARY BATTERY

PROBLEM TO BE SOLVED: To provide a lithium secondary battery with superior charging and discharging cycle characteristics and high energy density by providing a negative pole with its high capacity. SOLUTION: In a lithium secondary battery made by arranging a positive pole having a metal oxide as a positive active substance wiSh intervening an organic electrolyte and a separator at a negative pole, the negative pole fines gallium or gallium alloy capable of lithium intercalation or release to 10μm or less in particle size and is combined with a carbon material capable of lithium intercalation and release, whereby crystal fining due to expansion and contraction of the alloy base material or capacity degradation due to peeling off is prevented, and the negative pole with its high capacity and cycle characteristics is provided. In addition, it is effective to use a copper gallium alloy or lithium gallium alloy in order to fine the metal gallium to 10μm or less in particle size.