US2003162099A1PendingUtilityA1
Non-aqueous electrochemical cell
Priority: Feb 28, 2002Filed: Feb 28, 2002Published: Aug 28, 2003
Est. expiryFeb 28, 2022(expired)· nominal 20-yr term from priority
H01M 6/166H01M 10/0569H01M 10/052H01M 10/0568H01M 2300/0037H01M 6/164Y02P70/50Y10T29/49108Y02E60/10
47
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Claims
Abstract
A lithium electrochemical cell includes an electrolyte having a mixture of solvents including propylene carbonate (PC) and dimethoxyethane (DME), and a salt mixture. The salt mixture includes lithium trifluoromethanesulfonate (LiTFS), and lithium trifluoromethanesulfonimide (LiTFSI), and the cell contains less than 1500 ppm by weight of sodium. The mixture of solvents can further include ethylene carbonate (EC).
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A lithium electrochemical cell, comprising:
an electrolyte comprising:
a mixture of solvents comprising:
propylene carbonate;
dimethoxyethane; and
a salt mixture comprising:
lithium trifluoromethanesulfonate; and
lithium trifluoromethanesulfonimide,
wherein the cell contains less than 1500 ppm by weight of sodium.
2 . The cell of claim 1 , wherein the cell contains less than 1200 ppm by weight of sodium.
3 . The cell of claim 1 , wherein the cell contains less than 1000 ppm by weight of sodium.
4 . The cell of claim 1 , wherein the cell contains less than 800 ppm by weight of sodium.
5 . The cell of claim 1 , wherein the cell contains less than 600 ppm by weight of sodium.
6 . The cell of claim 1 , wherein the mixture of solvents comprises:
40-80% by weight of dimethoxyethane; and 20-60% by weight of propylene carbonate; and the salt mixture has a concentration between 0.4 M and 1.2 M in the mixture of solvents.
7 . The cell of claim 6 , wherein the mixture of solvents comprises:
50-75% by weight of dimethoxyethane; and 25-50% by weight of propylene carbonate.
8 . A lithium electrochemical cell, comprising:
an electrolyte comprising:
a mixture of solvents comprising:
ethylene carbonate;
propylene carbonate; and
dimethoxyethane; and
a salt mixture comprising:
lithium trifluoromethanesulfonate; and
lithium trifluoromethanesulfonimide,
wherein the cell contains less than 1500 ppm by weight of sodium.
9 . The cell of claim 8 , wherein the cell contains less than 1200 ppm by weight of sodium.
10 . The cell of claim 8 , wherein the cell contains less than 1000 ppm by weight of sodium.
11 . The cell of claim 8 , wherein the cell contains less than 800 ppm by weight of sodium.
12 . The cell of claim 8 , wherein the cell contains less than 600 ppm by weight of sodium.
13 . The cell of claim 8 , wherein the mixture of solvents comprises:
less than 30% by weight of ethylene carbonate; 40-85% by weight of dimethoxyethane; and the salt mixture has a concentration between 0.4 M and 1.2 M in the mixture of solvents.
14 . The cell of claim 13 , wherein the mixture of solvents comprises:
10-20% by weight of ethylene carbonate; 50-70% by weight of dimethoxyethane.
15 . The cell of claim 14 , comprising less than 500 ppm by weight of sodium.
16 . The cell of claim 13 , wherein the mixture of solvents comprises: 5-15% by weight of ethylene carbonate; 70-80% by weight of dimethoxyethane; and 10-20% by weight of propylene carbonate.
17 . The cell of claim 16 , comprising less than 500 ppm by weight of sodium.Join the waitlist — get patent alerts
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