Method for increasing recycling life of non-aqueous cells
First Claim
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1. A method for improving the cycling life of a rechargeable cell containing an active anode metal subject to dendritic plating on charging, a porous cathode, an electrolyte solvent and a dissolved salt which is stable at charging voltages and capable of forming soluble oxidizing moieties, at higher voltages;
- which moieties are capable of scavenging and solvating insoluble electrically disconnected anode metal and anode metal in insoluble compounds within said cell and said salt being further capable of being recycled thereby;
said method comprising charging said cell at a voltage above said charging voltage and sufficiently high whereby said salt forms said soluble oxidizing moieties at said cathode which scavenge and solvate insoluble electrically disconnected anode metal and anode metal in insoluble compounds with said salt being recycled thereby.
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Abstract
A method for increasing the recycling life of an electrochemical cell containing a lithium (or other active metal subject to dendritic plating) anode and a clovoborate salt or other salt, which forms soluble oxidizing agents at elevated charging voltages, comprising the step of charging the cell at a potential above normal charging voltage whereby said soluble oxidizing agents are formed.
28 Citations
16 Claims
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1. A method for improving the cycling life of a rechargeable cell containing an active anode metal subject to dendritic plating on charging, a porous cathode, an electrolyte solvent and a dissolved salt which is stable at charging voltages and capable of forming soluble oxidizing moieties, at higher voltages;
- which moieties are capable of scavenging and solvating insoluble electrically disconnected anode metal and anode metal in insoluble compounds within said cell and said salt being further capable of being recycled thereby;
said method comprising charging said cell at a voltage above said charging voltage and sufficiently high whereby said salt forms said soluble oxidizing moieties at said cathode which scavenge and solvate insoluble electrically disconnected anode metal and anode metal in insoluble compounds with said salt being recycled thereby. - View Dependent Claims (2, 3, 6, 7, 8, 9, 10)
- which moieties are capable of scavenging and solvating insoluble electrically disconnected anode metal and anode metal in insoluble compounds within said cell and said salt being further capable of being recycled thereby;
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4. A method for improving the cycling life of a rechargeable cell containing an active anode metal subject to dendritic plating on charging, a porous cathode, an electrolyte solvent and a dissolved salt which is stable at charging voltages;
- said method comprising charging said cell at a voltage sufficiently high whereby said salt forms soluble oxidizing moieties at said cathode which scavenge and solvate insoluble electrically disconnected anode metal and anode metal in insoluble compounds with said salt being recycled thereby, wherein said salt is a clovoborate salt which has an anion with the formula (Bm Xn)-k wherein m, n and k are integers with m ranging from 6-20, n ranging from 16-18 and k ranging from 1-4, B is boron and X is selected from the group consisting of H, F, Cl, Br, I, OH and combinations thereof, and wherein said electrolyte solvent consists essentially of SO2.
- View Dependent Claims (5)
- 11. A method for improving the cycling life of a rechargeable non-aqueous inorganic cell comprising a lithium anode, a porous cathode, an inorganic sulfur dioxide electrolyte solvent and a clovoborate salt comprising the step of charging said cell at a voltage above 3.5 volts for at least part of the time for said charging.
Specification