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AssigneeNanotek Instruments, Inc.
InventorsHui He, Bor Z Jang, Yanbo Wang, Aruna Zhamu, Wei Xiong
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A rechargeable lithium-sulfur cell comprising a cathode, an anode, a separator electronically separating the two electrodes, a first electrolyte in contact with the cathode, and a second electrolyte in contact with the anode, wherein the first electrolyte contains a first concentration, C1, of a first lithium salt dissolved in a first solvent when the first electrolyte is brought in contact with the cathode, and the second electrolyte contains a second concentration, C2, of a second lithium salt dissolved in a second solvent when the second electrolyte is brought in contact with the anode, wherein C1 is less than C2. The cell exhibits an exceptionally high specific energy and a long cycle life.
A rechargeable lithium-sulfur cell comprising a cathode having a sulfur-containing cathode active material, an anode having an anode active material, a separator electronically separating said anode and said cathode, a first electrolyte in contact with said cathode active material, and a second electrolyte in contact with said anode active material, wherein said first electrolyte contains a first concentration, C1, of a first lithium salt dissolved in a first liquid solvent, and said second electrolyte contains a second concentration, C2, of a second lithium salt dissolved in a second liquid solvent wherein said second concentration C2 is greater than said first concentration C1 by a factor of 2 or more, and said second concentration, C2, is no less than 4 molar (mole/L), wherein an amount of said second electrolyte is greater than an amount of said first electrolyte, wherein said first electrolyte is not in contact with said anode and said second electrolyte is not in contact with said cathode, wherein said first electrolyte is not mixed with said second electrolyte, and wherein said first electrolyte and said second electrolyte are selected from a polymer gel electrolyte, ionic liquid electrolyte, non-aqueous liquid electrolyte, or a combination thereof, and wherein said first lithium salt and said second lithium salt are selected from lithium perchlorate (LiClO4), lithium hexafluorophosphate (LiPF6), lithium borofluoride (LiBF4), lithium hexafluoroarsenide (LiAsF6), lithium trifluoro-metasulfonate (LiCF3SO3), bis-trifluoromethyl sulfonylimide lithium (LiN(CF3SO2)2, lithium bis(oxalato)borate (LiBOB), lithium oxalyldifluoroborate (LiBF2C2O4), lithium nitrate (LiNO3), Li-fluoroalkyl-phosphates (LiPF3(CF2CF3)3), lithium bisperfluoroethysulfonylimide (LiBETI), an ionic liquid salt, and combinations thereof.
A rechargeable lithium-sulfur cell comprising a cathode having a sulfur-containing cathode active material, an anode having an anode active material, a separator electronically separating said anode and said cathode, a first electrolyte in contact with said cathode active material, and a second electrolyte in contact with said anode active material, wherein said first electrolyte contains a first concentration, C1, of a first lithium salt dissolved in a first liquid solvent, and said second electrolyte contains a second concentration, C2, of a second lithium salt dissolved in a second liquid solvent and said first concentration and said second concentration are measured before said second electrolyte is brought in contact with said first electrolyte, wherein C1 is less than C2, wherein said cathode comprises a porous composite active material consisting of:
Dependencies are inferred from the claim text.