Electrolyte for a rechargeable cell
AssigneeAccentus PLC
InventorsMichael Jonathan Lain, Robin John Neat
Life of this patent
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Abstract
An electrolyte for use in a rechargeable cell whose charging voltage exceeds 3.8 volts includes a redox chemical comprising a substituted aromatic molecule in which α hydrogens are either absent, or are sterically against loss from the ionized form of the molecule. Such as chemical can act as a redox shuttle during overcharge, suppressing damage to the cell and preventing the deposition of metallic lithium during the overcharge of a lithium ion cell, but does not affect normal operation of the cell during either charge or discharge. One such molecule is hexaethyl benzene.
Claims13
An electrolyte for use in a rechargeable lithium or lithium ion cell whose voltage exceeds 3.8 volts during charging, the electrolyte comprising a lithium salt in solution in an organic solvent, the electrolyte also comprising an organic polymer, so it is a polymeric gel electrolyte, wherein the electrolyte includes a redox chemical comprising substituted aromatic molecules in which there are a protons, and the a protons are stabilized by molecular geometry against loss from the ionized form of the molecule.
An electrolyte for use in a rechargeable lithium or lithium ion cell whose voltage exceeds 3.8 volts during charging, the electrolyte comprising a lithium salt in solution in an organic solvent, wherein the electrolyte includes a redox chemical comprising a substituted benzene of the general formula C6R1R2R3R4R5R6 in which:
- a) R1 to R6 are selected from trihalomethyl groups, C2 to C10 alkyl groups, or halogen-substituted C2 to C10 alkyl groups;
- or
- b) R1 to R5 are as specified in (a), and R6 is H or a halogen,
- so that α protons are either absent, or are stabilized by molecular geometry against loss from the ionized form of the molecule.
Dependencies are inferred from the claim text.