US2003113622A1PendingUtilityA1
Electrolyte additive for non-aqueous electrochemical cells
Priority: Dec 14, 2001Filed: Dec 14, 2001Published: Jun 19, 2003
Est. expiryDec 14, 2021(expired)· nominal 20-yr term from priority
H01M 4/661H01M 50/145H01M 50/119Y02P70/50H01M 6/166H01M 4/502Y10T29/49108Y02E60/10
46
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Claims
Abstract
An electrochemical secondary cell is disclosed. The cell includes a cathode, an anode, a current collector including aluminum, and an electrolyte containing a perchlorate salt and a second salt. The electrolyte is essentially free of LiPF 6 .
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . An electrochemical cell comprising a cathode, an anode, a current collector including aluminum, an electrolyte containing a perchlorate salt and a second salt, wherein the electrochemical cell is a secondary cell, and wherein the electrolyte is essentially free of LiPF 6 .
2 . The cell of claim 1 , wherein the electrolyte contains at least 5000 ppm by weight of a perchlorate salt.
3 . The cell of claim 2 , wherein the electrolyte contains at least 10,000 ppm by weight of a perchlorate salt.
4 . An electrochemical cell comprising a cathode containing MnO 2 , an anode containing lithium, and an electrolyte containing a perchlorate salt, wherein the cell includes an aluminum surface in electrical contact with a second metal surface, wherein the second metal surface is different than the aluminum surface.
5 . The cell of claim 4 , wherein the second metal surface is a steel surface.
6 . The cell of claim 4 , wherein the second metal surface is a stainless steel surface.
7 . The cell of claim 4 , wherein the second metal surface is an aluminum or aluminum alloy surface.
8 . The cell of claim 4 , wherein the second metal surface is a nickel surface.
9 . The cell of claim 4 , wherein the cell includes a cathode current collector comprising aluminum.
10 . The cell of claim 4 , wherein the electrolyte contains about 500 to about 2500 ppm by weight of the perchlorate salt.
11 . The cell of claim 4 , wherein the perchlorate salt is LiClO 4 .
12 . The cell of claim 4 , wherein the perchlorate salt is Ca(ClO 4 ) 2 .
13 . The cell of claim 4 , wherein the perchlorate salt is Ba(ClO 4 ) 2 .
14 . The cell of claim 4 , wherein the perchlorate salt is Al(ClO 4 ) 3 .
15 . The cell of claim 4 , wherein the electrolyte is essentially free of LiPF 6 .
16 . The cell of claim 4 , wherein the aluminum surface is a portion of an object having at least one dimension greater than 0.5 mm.
17 . The cell of claim 4 , wherein the aluminum surface is a portion of an object having at least one dimension greater than 1 mm.
18 . The cell of claim 4 , wherein the aluminum surface is a portion of an object having at least one dimension greater than 2 mm.
19 . An electrochemical cell comprising a cathode containing an aluminum current collector, an anode, and an electrolyte containing a lithium salt and a perchlorate salt, wherein the cell is a primary electrochemical cell.
20 . The cell of claim 19 , wherein the cathode contains MnO 2 .
21 . The cell of claim 19 , wherein the anode contains lithium.
22 . The cell of claim 19 , wherein the electrolyte contains at least 500 ppm by weight of the perchlorate salt.
23 . The cell of claim 19 , wherein the electrolyte contains at least 1000 ppm by weight of the perchlorate salt.
24 . The cell of claim 19 , wherein the electrolyte contains at least 1500 ppm by weight of the perchlorate salt.
25 . The cell of claim 19 , wherein the electrolyte contains at least 2500 ppm by weight of the perchlorate salt.
26 . The cell of claim 19 , wherein the electrolyte contains less than 20,000 ppm by weight of the perchlorate salt.
27 . The cell of claim 19 , wherein the perchlorate salt is LiClO 4 .
28 . The cell of claim 19 , wherein the perchlorate salt is Ca(ClO 4 ) 2 .
29 . The cell of claim 19 , wherein the perchlorate salt is Ba(ClO 4 ) 2 .
30 . The cell of claim 19 , wherein the perchlorate salt is Al(ClO 4 ) 3 .
31 . The cell of claim 19 , wherein the cell includes a case comprising aluminum.
32 . The cell of claim 31 , wherein the case consists essentially of aluminum.
33 . The cell of claim 19 , wherein the electrolyte further comprises LiPF 6 .
34 . The cell of claim 33 , wherein the electrolyte contains at least 5000 ppm by weight LiPF 6 .
35 . The cell of claim 34 , wherein the electrolyte contains at least 10,000 ppm by weight LiPF 6 .
36 . The cell of claim 19 , wherein the electrolyte is essentially free of LiPF 6 .
37 . An electrochemical cell comprising a cathode containing MnO 2 , an anode containing lithium, an aluminum surface, and an electrolyte containing about 500 ppm to about 2000 ppm by weight of a perchlorate salt.
38 . The cell of claim 37 , wherein the perchlorate salt is LiClO 4 .
39 . The cell of claim 37 , wherein the perchlorate salt is Ca(ClO 4 ) 2 .
40 . The cell of claim 37 , wherein the perchlorate salt is Ba(ClO 4 ) 2 .
41 . The cell of claim 37 , wherein the perchlorate salt is Al(ClO 4 ) 3 .
42 . An electrochemical cell comprising a cathode containing MnO 2 , an anode containing lithium, and an electrolyte containing a perchlorate salt, wherein the cell is a primary electrochemical cell, and wherein the cell includes two pieces of aluminum in electrical contact with each other.
43 . A method of inhibiting aluminum corrosion in an electrochemical cell, the method comprising:
(a) adding a perchlorate salt to an electrolyte; and (b) placing the electrolyte, an anode containing Li, and a cathode containing MnO 2 and an aluminum current collector into a cell case to form the cell, wherein the cell is a primary electrochemical cell.
44 . The method of claim 43 , wherein the perchlorate salt is LiClO 4 .
45 . The method of claim 43 , wherein the perchlorate salt is Ca(ClO 4 ) 2 .
46 . The method of claim 43 , wherein the perchlorate salt is Ba(ClO 4 ) 2 .
47 . The method of claim 43 , wherein the perchlorate salt is Al(ClO 4 ) 3 .Join the waitlist — get patent alerts
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