US 5,672,329 A · Manganese oxides production thereof, and use thereof

Abstract

A manganeses oxide is provided which is represented by the general formula A.sub.x Mn.sub.2 O.sub.4.nH.sub.2 O, 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.ltoreq.x.ltoreq.1 and 0.ltoreq.n.ltoreq.20; and if A is Co 0<x.ltoreq.1 and n=0. The manganese oxide has a spinel type, a layer type, or amorphous type 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 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.

Claims9

Dependent claims

A manganese oxide represented by the general formula A.sub.x Mn.sub.2 O.sub.4.nH.sub.2 O, where A is selected from the group consisting of Zn, Mg, Ca and Co;

and if A is Zn, 0.1<x<0.67, n=0 and said manganese oxide has a spinel crystal structure;
if A is Mg, 0<x<1, 0.ltoreq.n.ltoreq.20, said manganese oxide has a layer crystal structure having interplanar spacings
9.23.+-.0.05 angstrom
7.14.+-.0.05 angstrom
5.00.+-.0.05 angstrom
3.56.+-.0.05 angstrom
2.51.+-.0.05 angstrom and
2.48.+-.0.05 angstrom;
if A is Ca, x is 1 or 0.1<x<0.19, and 0.ltoreq.n.ltoreq.20, said manganese oxide has an amorphous crystal structure when x=1 having interplanar spacings
4. 8.+-.0.05 angstrom
3.1.+-.0.05 angstrom
and said manganese oxide has a .delta. crystal structure when 0.1<x<0.19;
and if A is Co, 0.7<x<0.8, n=0 and said manganese oxide has a mixed crystal structure of both a layer and a spinel.

10 more elements

Dependencies are inferred from the claim text.

Manganese oxides production thereof, and use thereof

Life of this patent

Manganese oxides production thereof, and use thereof

Life of this patent

Abstract

Claims9