SODIUM AND VANADIUM OXIDE, ITS USE AS ACTIVE MATERIAL FOR A POSITIVE ELECTRODE

摘要

The invention concerns sodium and vanadium oxide. The inventive oxide corresponds to the formula HyVa1-yV3O8.nH2O (I) wherein 0 < n < 1.70 and 0 < y 0.5; it crystallises in the Pnma space group; the crystal lattice parameters after dehydration by thermal treatment is as follows: a = 18.593(8) ANGSTROM , b = 9.431(4) ANGSTROM , c = 3.6081(7) ANGSTROM , V = 632.7(6) ANGSTROM . The oxide is useful as active material for a rechargeable battery positive electrode.