US5482796A
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US
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Electrochemical cell comprising gamma MnO2 cathode having filamentary protrusions
Assignee: Gillette Co LLC
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Filing: 1994-05-03
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Granted: 1996-01-09
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Expires: 2014-05-03
Abstract
Abstract The invention relates to the manufacture of manganese dioxide by a chemical process. The resulting manganese dioxide product takes the form of particles characterized by filament-like protrusions jutting out from its surface. The manganese dioxide particles having such surface features can be manufactured by reacting manganese sulfate with sodium peroxodisulfate in an aqueous solution. The process can be controlled to yield high density manganese dioxide. The manganese dioxide formed in the process can be deposited directly onto the surface of electrolytic manganese dioxide (EMD). The manganese dioxide product is particularly suitable for use as a cathode active material in electrochemical cells.
Inventors
- 👤 Enoch I. Wang
- 👤 Lifun Lin
- 👤 William L. Bowden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:41
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; C01P2004/00; C01P2004/01; C01P2004/03; C01P2004/10; C01P2006/00; C01P2006/10; C01P2006/40; C01P2006/60; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
66 words
An electrochemical cell having MnO 2 cathode active material in said cell, wherein the MnO 2 material comprises particles the surfaces of which comprise gamma MnO 2 having filamentary protrusions radiating outwardly from the particles, said filamentary protrusions being visible at a magnification of between about 200 and 2000 times actual size and not visible at a magnification of less than about 200 times actual size.
Claim 2
Dependent Claim
66 words
An electrochemical cell having MnO 2 cathode active material in said cell, wherein the MnO 2 material comprises particles the surfaces of which comprise gamma MnO 2 having filamentary protrusions radiating outwardly from the particles, said filamentary protrusions being visible at a magnification of between about 200 and 2000 times actual size and not visible at a magnification of less than about 200 times actual size.
Claim 3
Dependent Claim
24 words
The electrochemical cell of claim 1, wherein said electrochemical cell has an anode comprising material selected from the group consisting of lithium and zinc.
Claim 4
Dependent Claim
19 words
The electrochemical cell of claim 1 wherein said MnO 2 material comprises at least 95% gamma MnO 2 .
Claim 5
Dependent Claim
35 words
The electrochemical cell of claim 1 wherein the filamentary protrusions are substantially uniformly distributed over the surface of said particles and the filamentary protrusions have a length to width ratio between about 2:1 and 20:1.
Claim 6
Dependent Claim
62 words
An electrode for an electrochemical cell comprising MnO 2 particles comprising at least 95% gamma MnO 2 having filamentary protrusions of MnO 2 radiating outwardly from the surface of said particles, said filamentary protrusions being visible at a magnification of between about 200 and 2000 times actual size and not visible at a magnification of less than about 200 times actual size.
Claim 7
Dependent Claim
62 words
An electrode for an electrochemical cell comprising MnO 2 particles comprising at least 95% gamma MnO 2 having filamentary protrusions of MnO 2 radiating outwardly from the surface of said particles, said filamentary protrusions being visible at a magnification of between about 200 and 2000 times actual size and not visible at a magnification of less than about 200 times actual size.
Claim 8
Dependent Claim
19 words
The electrochemical cell of claim 2 wherein the anode comprises lithium and said cell further comprises a non-aqueous electrolyte.
Claim 9
Dependent Claim
65 words
An electrochemical cell having MnO 2 cathode active material in said cell, wherein the MnO 2 material comprises at least 95% gamma MnO 2 particles the surfaces of which have filamentary protrusions radiating outwardly therefrom, said filamentary protrusions being visible at a magnification between about 200 and 2000 times actual size and not visible at a magnification of less than about 200 times actual size.
Claim 10
Dependent Claim
65 words
An electrochemical cell having MnO 2 cathode active material in said cell, wherein the MnO 2 material comprises at least 95% gamma MnO 2 particles the surfaces of which have filamentary protrusions radiating outwardly therefrom, said filamentary protrusions being visible at a magnification between about 200 and 2000 times actual size and not visible at a magnification of less than about 200 times actual size.
Claim 11
Dependent Claim
85 words
An electrochemical cell having anode active material, a cathode active material and electrolyte in said cell, said cathode active material comprising a hybrid MnO 2 material comprising gamma MnO 2 on the surface of particles of electrolytic manganese dioxide (EMD), said hybrid MnO 2 material having filamentary protrusions of MnO 2 radiating outwardly therefrom, said filamentary protrusions being visible at a magnification of between about 200 and 2000 times actual size and not visible at a magnification of less than about 200 times actual size.
Claim 12
Dependent Claim
85 words
An electrochemical cell having anode active material, a cathode active material and electrolyte in said cell, said cathode active material comprising a hybrid MnO 2 material comprising gamma MnO 2 on the surface of particles of electrolytic manganese dioxide (EMD), said hybrid MnO 2 material having filamentary protrusions of MnO 2 radiating outwardly therefrom, said filamentary protrusions being visible at a magnification of between about 200 and 2000 times actual size and not visible at a magnification of less than about 200 times actual size.
Claim 13
Dependent Claim
17 words
The electrochemical cell of claim 8 wherein said electrochemical cell has an anode active material comprising lithium.
Claim 14
Dependent Claim
17 words
The electrochemical cell of claim 8 wherein said electrochemical cell has an anode active material comprising zinc.
Claim 15
Dependent Claim
14 words
The electrochemical cell of claim 8 wherein said electrochemical cell is an alkaline cell.
Claim 16
Dependent Claim
83 words
An electrochemical cell having anode active material, a cathode active material and electrolyte in said cell, said cathode active material comprising a hybrid MnO 2 material comprising gamma MnO 2 on the surface of particles comprising carbonaceous material, said hybrid MnO 2 material having filamentary protrusions of MnO 2 radiating outwardly therefrom, said filamentary protrusions being visible at a magnification of between about 200 and 2000 times actual size and not visible at a magnification of less than about 200 times actual size.
Claim 17
Dependent Claim
83 words
An electrochemical cell having anode active material, a cathode active material and electrolyte in said cell, said cathode active material comprising a hybrid MnO 2 material comprising gamma MnO 2 on the surface of particles comprising carbonaceous material, said hybrid MnO 2 material having filamentary protrusions of MnO 2 radiating outwardly therefrom, said filamentary protrusions being visible at a magnification of between about 200 and 2000 times actual size and not visible at a magnification of less than about 200 times actual size.
Claim 18
Dependent Claim
13 words
The electrochemical cell of claim 12 wherein the anode active material comprises lithium.
Claim 19
Dependent Claim
13 words
The electrochemical cell of claim 12 wherein the anode active material comprises zinc.
Claim 20
Dependent Claim
14 words
The electrochemical cell of claim 12 wherein said electrochemical cell is an alkaline cell.
References Cited (Backward Citations)
US4277360A
Cited
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