WO1998002929B1

WO1998002929B1 - A method for preparing mixed amorphous vanadium oxides and their use as electrodes in rechargeable lithium cells

Info

Publication number: WO1998002929B1
Application number: PCT/US1997/011285
Authority: WO
Filing date: 1997-06-27
Publication date: 1998-02-19
Anticipated expiration: 1999-01-11

Abstract

Methods for preparing amorphous ternary lithiated vanadium metal oxides and amorphous binary non-lithiated metal oxides with the formula LixMyVzO¿(x+5z+ny)/z? and MyVzO¿(5z+ny)/z? respectively. M is a metal, 0 < x < 3, 0 < y < 3, 1 < z < 4, and n=2 or 3. The metal vanadium oxides are formed by aqueous precipitation methods. Rechargeable lithiated intercalation battery cells using the above materials as negative electrode active materials are also disclosed.

Claims

AMENDED CLAIMS[received by the International Bureau on 12 January 1998 (120198) original claims 1-18 replaced by amended claims 1 11 (3 pages)]

1. A method for preparing an amorphous ternary lithiated vanadium metal oxide of the formula Lι_xM_yV₇0 _{(} 52+ny) /2}> where M

^ is a metal, 0 < x < 3, 0 < y < 3, 1 < z 4 , and n = 2 or 3 c h a r a c t e r i z e d i n t h a t a) an aqueous solution is prepared of

1 ) at least one metavanadate salt selected from the group consisting of NH₄V0₃ and NaV0₃, 0 2) a nitrate salt of the formula M(N0₃)_n, where M is said metal, and 3) a large excess of _α lithium salt; b) the resulting solution is heated; and c) a sufficient amount of a base is added to the heated 5 solution to obtain a pH suitable for precipitating the amorphous lithiated vanadium metal oxide.

2. A method according to claim 1 c h a r a c t e r i z e d i n t h a t 0 said aqueous solution is prepared by mixing a) a first aqueous solution comprising said metavanadate salt; and b) a second aqueous solution comprising said nitrate and lithium salts. 5

3. A method according to claim 1 wherein said base is selected from the group consisting of ammonia, amines, alkali hydroxides, alkaline earth hydroxides, alkali salts of alcohols, and alkali salts of carboxylic acids. 0

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4. A method according to claim 1 wherein said base is added in the form of an aqueous solution of said base.

5. A method according to claim 1 wherein said lithium salt is selected from the group consisting of ιN0₃, LiOH, LiOH-H.O, and

Lι₂C0₃.

6. A method according to claim 1 wherein said heating comprises heating the solution to a temperature in the range of about 80°C to 95°C.

7. A method according to claim 1 wnerein said metal is at least one metal selected from the qroup consisting of manganese, cobalt, iron, copper, cadmium, nickel, chromium, indium, aluminum, and magnesium.

8. A non-aqueous secondary battery cell comprising an active negative electrode material, an active positive electrode material, and an non-aqueous electrolyte c h a r a c t e r i z e d i n t h a t said active positive electrode material is an amorphous vanadium metal oxide selected from the group consisting of: a) ternary lithiated vanadium metal oxides of the formula Lι_xM_yV_zO_(x+5Z+ny)/2, where M is a metal, 0 < x < 3, 0 < y < 3, 1 < z < 4, and n = 2 or 3; and b) binary non-lithiated vanadium metal oxides of the formula M_yV_zO_{(5z+ny) 2}, where M is a metal, 0 < y < 3, 1 < z < 4, and n = 2 or 3.

9. A cell according to claim 8 wherein said active positive electrode material is a ternary lithiated vanadium metal oxide prepared by a process according to claim 1.

10. A non-aqueous secondary battery cell comprising an active negative electrode material, an active positive electrode material, and an non-aqueous electrolyte c h a r a c t e r i z e d i n t h a t said active negative electrode material is an amorphous vanadium metal oxide selected from the group consisting of: a) ternary lithiated vanadium metal oxides of the formula Li_xM_yV_Ξ0_{(x+5z+ny) 2}, where M is a metal, 0 < x < 3, 0 < y < 3, 1 < z < 4, and n = 2 or 3; and b) binary non-lithiated vanadium metal oxides of the formula M_yV_zO_{(5z+ny) /2}, where M is a metal, 0 < y < 3, 1 < z < 4 , and n = 2 or 3.

11. A cell according to claim 10 wherein said active negative electrode material is a ternary lithiated vanadium metal oxide prepared by a process according to claim 1.

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The present application has been amended to more particularly recite in claims 8 and 10 the characterizing aspects of the battery cell electrode materials which distinguish the cited art. Claims 8 through 12 have been cancelled m order to obviate any possible conflict with the cited references.

The foregoing amendments are identical to those made in the U.S. priority application in order to render allowable claims corresponding to those in the present application.

In view of the foregoing, Applicant submits that the instant application meets the standards of formality and clarity, as well as the criteria set out in PCT Article 33(1) . The Examiner's consideration and favorable Report to that effect are earnestly solicited.

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