Patent EP0009934A1 successfully refreshed from Google Patents.
EP0009934A1
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EP
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Manganese dioxide, method for its manufacture and electrochemical cell having cathode containing said manganese dioxide
Assignee: Union Carbide Corp
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Filing: 1979-09-28
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Granted: —
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Expires: 1999-09-28
Abstract
Abstract There is disclosed a new form of manganese dioxide having an x-ray diffraction pattern resembling none of the x-ray patterns of the known forms of manganese dioxide, together with a method for its manufacture by acid treatment of LiMn 2 O 4 . The manganese dioxide of the invention is useful in the manufacture of cathodes for electrochemical cells and there is also disclosed an electrochemical cell in which at least a portion of the cathode comprises the new form of manganese dioxide.
Inventors
- 👤 James Charles Hunter
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 21:31
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/50; H01M4/502; C; C01; C01G; C01G45/00; C01G45/02; C01G45/024; C01P; C01P2002/00; C01P2002/70; C01P2002/72; C01P2006/00; C01P2006/80; H01M6/00; H01M6/04; H01M6/06; H01M6/14; H01M6/16; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
9 words
A manganese dloxide composition having the x-ray diffraction pattern:
Claim 2
Dependent Claim
9 words
A manganese dloxide composition having the x-ray diffraction pattern:
Claim 3
Dependent Claim
20 words
A manganese dioxide as claimed in claim 1 wherein the relative intensities of the x-ray diffraction peaks are as follows:
Claim 4
Dependent Claim
22 words
A manganese dioxide as claimed in claim 1 or 2 wherein the relative intensities of the x-ray diffraction peaks are as follows:
Claim 5
Independent Claim
14 words
A method of manufacturing a manganese dioxide comprising acid-treating LiMn 2 O 4 .
Claim 6
Independent Claim
14 words
A method of manufacturing a manganese dioxide comprising acid-treating LiMn 2 O 4 .
Claim 7
Dependent Claim
56 words
A method as claimed in claim 4 wherein the acid treatment comprises the steps of: (a) suspending LiMn 2 O 4 in water; (b) adding aqueous acid while stirring; (c) monitoring the pH of the solution phase; and (d) continuing the acid addition until the pH of the solution phase stabilizes at below about pH 2.5.
Claim 8
Dependent Claim
30 words
A method as claimed in claim 5 comprising the additional steps of: (e) washing until the wash water is about neutral; (f) filtering; and (g) drying the MnO 2 product.
Claim 9
Dependent Claim
30 words
A method as claimed in claim 5 or 6 wherein the acid addition step (d) is continued until the pH of the solution phase stabilizes at below about pH 2.0.
Claim 10
Independent Claim
29 words
A method as claimed in any one of claims 4 to 7, wherein the acid is selected from the group consisting of sulfuric acid, hydrochloric acid, and nitric acid.
Claim 11
Independent Claim
21 words
A method as claimed in any one of claims 4 to 8, wherein the manganese dioxide has the x-ray diffraction pattern:
Claim 12
Dependent Claim
22 words
An electrochemical cell comprising an anode, a cathode, and an electrolyte, at least a portion of said cathode comprising λ-MnO 2 .
Claim 13
Dependent Claim
22 words
An electrochemical cell comprising an anode, a cathode, and an electrolyte, at least a portion of said cathode comprising λ-MnO 2 .
Claim 14
Dependent Claim
28 words
An electrochemical cell as claimed in claim 10 wherein said electrolyte is selected from the group consisting of an aqueous electrolyte, a non-aqueous electrolyte, and a solid electrolyte.
Claim 15
Dependent Claim
24 words
An electrochemical cell as claimed in claim 11 wherein said non-aqueous electrolyte is 1 molar LiBF 4 in 1:1 (volume ratio) propylene carbonate- di-methoxyethane.
Claim 16
Dependent Claim
20 words
An electrochemical cell as claimed in any one of claims 10 to 12, wherein said anode is a Li anode.
References Cited (Backward Citations)
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