| 摘要 |
A manganese oxide is provided which is represented by the general formula AxMn2O4.nH2O, where A is Zn, Mg, Ca, or Co; and if A is Zn, 0 </= x < 1 and n = 0; if A is Mg or Ca, 0 </= x </= 1 and and 0 </= n </= 20; and if A is Co, 0 < x </= 1 and n = 0. The manganese oxide has a spinel type, a layer type, amorphous type or both crystal structures of layer type and spinel type. The manganese oxide is produced by oxidizing a mixture of a hydroxide of A (where A is Zn, Mg, Ca, or Co) and manganese hydroxide in a molar ratio of 1:2 in an alkali solution, and then removing A by oxidation treatment. A lithium secondary battery is provided by use of a kind of the above manganese oxide for the positive electrode, exhibiting high output with high energy density and with satisfactory reversibility in charge-discharge cycle. |
