| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a water-based lithium secondary battery having large charge/discharge capacity, and having an excellent charge/discharge cycle characteristic. <P>SOLUTION: This water-based lithium secondary battery has a positive electrode 2, a negative electrode 3 and an aqueous electrolytic solution. The positive electrode 2 contains a lithium-manganese complex oxide of a defective layered structure represented by formula: Li<SB>2-x</SB>Mn<SB>1-y</SB>M<SB>y</SB>O<SB>3-z</SB>(wherein, M is one or more kinds selected from Fe, Al, Ni, and Co; 0<x≤0.9; 0≤y≤0.5; and 0<z≤0.9) as a positive electrode active material. The negative electrode 3 contains a substance having lower storage and desorption potential of lithium than the lithium-manganese complex oxide of the defective layered structure represented by the formula as a negative electrode active material. The aqueous electrolytic solution is prepared by dissolving a lithium salt into water. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
