Liquid Electrolyte For An Electrochemical Cell With A Silicon-Based Anode
AssigneeApple Inc.
InventorsAlan A. Ritchie, Karl M. Brown, Andrew Basile, Bernd Jurgen Neudecker
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Abstract
Liquid electrolytes for electrochemical cells with silicon-based anodes are composed of an aprotic solvent, an ionic liquid, a lithium salt, and 8 mol % to 30 mol % hydrofluoroether. A molar ratio of the hydrofluoroether to the lithium salt is 0.22:1 to 0.83:1. The liquid electrolytes achieve at least a 50% improvement in cycle life over conventional electrolytes, extend capacity retention and delay increases in internal resistance.
Claims20
A liquid electrolyte for an electrochemical cell, having a composition as follows:
- an aprotic solvent;
- an ionic liquid;
- a lithium salt;
- and
- 8 mol % to 30 mol % hydrofluoroether, wherein a molar ratio of the hydrofluoroether to the lithium salt is 0.22:1 to 0.83:1.
A liquid electrolyte for an electrochemical cell, having a composition as follows:
- DMC;
- PYR13FSI;
- a lithium salt;
- and
- 8 mol % to 30 mol % BTFE,
- wherein a molar ratio of BTFE to lithium salt is 0.22:1 to 0.83:1, a molar ratio of BTFE to DMC is 0.1:1 to 1:1, and a molar ratio of BTFE to a total of DMC and PYR13FSI is 0.15:1 to 0.5:1.
Dependencies are inferred from the claim text.