Ramsdelite type lithium titanate, lithium ion secondary battery and lithium ion capacitor using this ramsdelite type lithium titanate

摘要

PROBLEM TO BE SOLVED: To solve the problem that desired are a ramsdellite type lithium titanate having purity higher than that of a conventional ramsdellite type lithium titanate, a lithium ion secondary battery exhibiting high capacity and high rate characteristics and a lithium ion capacitor.SOLUTION: A ramsdellite type lithium titanate uses a ramsdellite type lithium titanate having 0.55-0.75 of a molar ratio (Li/Ti) of Li to Ti as a main component.