Non-aqueous electrolytes for lithium ion batteries
First Claim
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1. An electrolyte comprising:
- a lithium salt;
a polar aprotic solvent;
an additive at a concentration of 0.0005 M to 0.05 M, andabout 0.001 to about 8 wt % of an electrode stabilizing additive that is Li[PF2(C2O4)2], Li[B(C2O4)2], Li[BF2(C2O4)], or a mixture of any two or more thereof;
wherein;
the additive is an anion receptor that assists in the dissolution of LiF on the surface of electrodes; and
the lithium salt is other than Li[PF2(C2O4)2], Li[B(C2O4)2], or Li[BF2(C2O4)].
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Abstract
The present invention is generally related to electrolytes containing anion receptor additives to enhance the power capability of lithium-ion batteries. The anion receptor of the present invention is a Lewis acid that can help to dissolve LiF in the passivation films of lithium-ion batteries. Accordingly, one aspect the invention provides electrolytes comprising a lithium salt; a polar aprotic solvent; and an anion receptor additive; and wherein the electrolyte solution is substantially non-aqueous. Further there are provided electrochemical devices employing the electrolyte and methods of making the electrolyte.
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Citations
24 Claims
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1. An electrolyte comprising:
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a lithium salt; a polar aprotic solvent; an additive at a concentration of 0.0005 M to 0.05 M, and about 0.001 to about 8 wt % of an electrode stabilizing additive that is Li[PF2(C2O4)2], Li[B(C2O4)2], Li[BF2(C2O4)], or a mixture of any two or more thereof; wherein; the additive is an anion receptor that assists in the dissolution of LiF on the surface of electrodes; and the lithium salt is other than Li[PF2(C2O4)2], Li[B(C2O4)2], or Li[BF2(C2O4)]. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification