US5370949A
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Materials for use as cathodes in lithium electrochemical cells
Assignee: National Research Council Canada
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Filing: 1993-07-09
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Granted: 1994-12-06
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Expires: 2013-07-09
Abstract
Abstract The invention disclosed relates to a novel compound of molecular formula Li 2 Cr x Mn 2-x O 4 , wherein 0<X<2. This compound may be used as the active cathode material in secondary lithium ion cells. Secondary lithium ion cells including such cathodes are also described.
Inventors
- 👤 Isobel J. Davidson
- 👤 Roderick S. McMillan
- 👤 John J. Murray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:08
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/05; H01M10/056; H01M10/0564; H01M10/0566; H01M10/0569; H01M10/052; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/485; H01M2004/026; H01M2004/028; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
43 words
A single phase compound of molecular formula I Li.sub.2 Cr.sub.x Mn.sub.2-x O.sub.4 I wherein 0<x<2, having an X-ray powder diffraction pattern indexable to a crystallographic unit cell with a normalized unit cell volume of greater than 69.9 and less than 74.3 cubic Angstroms.
Claim 2
Dependent Claim
43 words
A single phase compound of molecular formula I Li.sub.2 Cr.sub.x Mn.sub.2-x O.sub.4 I wherein 0<x<2, having an X-ray powder diffraction pattern indexable to a crystallographic unit cell with a normalized unit cell volume of greater than 69.9 and less than 74.3 cubic Angstroms.
Claim 3
Dependent Claim
8 words
A compound according to claim 1, wherein 0.1≦x≦1.9.
Claim 4
Dependent Claim
8 words
A compound according to claim 1, wherein 0.1≦x≦1.5.
Claim 5
Dependent Claim
22 words
A compound according to claim 1, wherein 1.5≦x≦1.9, further characterized by an X-ray powder diffraction pattern indexable to a hexagonal unit cell.
Claim 6
Dependent Claim
22 words
A compound according to claim 1, wherein 0.1≦x≦1.25, further characterized by an X-ray powder diffraction pattern indexable to a tetragonal unit cell.
Claim 7
Dependent Claim
25 words
A cathode for use in a secondary lithium ion electrochemical cell, comprising as active material a compound of formula I as defined in claim 1.
Claim 8
Dependent Claim
13 words
A cathode according to claim 6, wherein the compound of Formula I, 0.1≦x≦1.9.
Claim 9
Dependent Claim
34 words
A secondary lithium ion electrochemical cell comprising, a lithium intercalation anode, a suitable non-aqueous electrolyte including a lithium salt, a cathode as defined in claim 6, and a separator between the anode and cathode.
Claim 10
Dependent Claim
42 words
An electrochemical cell according to claim 8, wherein the anode comprises a material selected from the group consisting of transition metal oxides, transition metal sulfides and carbonaceous materials, and wherein the electrolyte is in liquid form and includes a suitable organic solvent.
Claim 11
Dependent Claim
56 words
An electrochemical cell according to claim 9, wherein the lithium salt is selected from the group consisting of LiAsF 6 , LiPF 6 , LiBF 4 , LiClO 4 , LiBr, LiAlCl 4 , LiCF 3 SO 3 , KLiC(CF 3 SO 2 ) 3 , LiN(CF 3 SO 2 ) 2 , and mixtures thereof.
Claim 12
Dependent Claim
49 words
An electrochemical cell according to claim 10 wherein the organic solvent is selected from the group consisting of propylene carbonate, ethylene carbonate, 2-methyl tetrahydrofuran, tetrahydrofuran, dimethoxyethane, diethoxyethane, dimethyl carbonate, diethyl carbonate, methyl acetate, methylformate, γ-butyrolactone, 1,3-dioxolane, sulfolane, acetonitrile, butyronitrile, trimethylphosphate, dimethylformamide and other like organic solvents and mixtures thereof.
Claim 13
Dependent Claim
14 words
An electrochemical cell according to claim 11, wherein the anode comprises a carbonaceous material.
Claim 14
Dependent Claim
13 words
An electrochemical cell according to claim 12, wherein the anode comprises petroleum coke.
Claim 15
Dependent Claim
30 words
An electrochemical cell according to claim 13, wherein the electrolyte comprises 1 M LiN(CF 3 SO 2 ) 2 in a 50/50 mixture by volume of propylene carbonate and dimethoxyethane.
Claim 16
Dependent Claim
12 words
An electrochemical cell according to claim 14, wherein formula I, 0.1 ≦x≦1.9.
Claim 17
Dependent Claim
68 words
AS single phase compound of molecular formula I Li.sub.2 Cr.sub.x Mn.sub.2-x O.sub.4 I wherein 0<x<2, and wherein 1.5≦x≦1.9, further characterized by an X-ray powder diffraction pattern indexable to a hexagonal unit cell having dimensions a= 2.899 to 2.909Å and c=14.412Å to 14.442Å, and wherein 0.1<x<1.25, further characterized by an X-ray powder diffraction pattern indexable to a tetragonal unit cell having dimensions a=5.662Å to 5.76Å and c=9.274Å to 8.60Å.
Claim 18
Dependent Claim
68 words
AS single phase compound of molecular formula I Li.sub.2 Cr.sub.x Mn.sub.2-x O.sub.4 I wherein 0<x<2, and wherein 1.5≦x≦1.9, further characterized by an X-ray powder diffraction pattern indexable to a hexagonal unit cell having dimensions a= 2.899 to 2.909Å and c=14.412Å to 14.442Å, and wherein 0.1<x<1.25, further characterized by an X-ray powder diffraction pattern indexable to a tetragonal unit cell having dimensions a=5.662Å to 5.76Å and c=9.274Å to 8.60Å.
References Cited (Backward Citations)
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