Lithium-ion batteries with intrinsic pulse overcharge protection
First Claim
1. An electrochemical device comprising:
- a cathode comprising at least one primary positive material and at least one secondary positive material;
an anode; and
a non-aqueous electrolyte comprising a redox shuttle additive;
whereinthe redox potential of the redox shuttle additive is greater than the redox potential of the primary positive material;
the redox potential of the redox shuttle additive is lower than the redox potential of the secondary positive material; and
the redox shuttle additive is stable at least up to the redox potential of the secondary positive material.
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Accused Products
Abstract
The present invention relates in general to the field of lithium rechargeable batteries, and more particularly relates to the positive electrode design of lithium-ion batteries with improved high-rate pulse overcharge protection. Thus the present invention provides electrochemical devices containing a cathode comprising at least one primary positive material and at least one secondary positive material; an anode; and a non-aqueous electrolyte comprising a redox shuttle additive; wherein the redox potential of the redox shuttle additive is greater than the redox potential of the primary positive material; the redox potential of the redox shuttle additive is lower than the redox potential of the secondary positive material; and the redox shuttle additive is stable at least up to the redox potential of the secondary positive material.
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Citations
24 Claims
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1. An electrochemical device comprising:
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a cathode comprising at least one primary positive material and at least one secondary positive material; an anode; and a non-aqueous electrolyte comprising a redox shuttle additive; wherein the redox potential of the redox shuttle additive is greater than the redox potential of the primary positive material; the redox potential of the redox shuttle additive is lower than the redox potential of the secondary positive material; and the redox shuttle additive is stable at least up to the redox potential of the secondary positive material. - 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)
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24. A electrochemical device comprising:
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a cathode comprising at least one primary positive material and at least one secondary positive material; an anode; and a non-aqueous electrolyte comprising; Li2B10X10, Li2B12X12, or a mixture thereof;
wherein each X is independently selected from the group consisting of H, F, Cl, Br, I, OCH3, and OH;a polar aprotic solvent; and a redox shuttle additive; wherein, the primary positive material is LiFePO4; the secondary positive material is spinel, LiMn2O4, LiCoO2, LiCo1−
α
′
Alα
′
O2, or Li1+x′
Niα
Mnβ
Coγ
Met′
δ
O2-z′
Y′
z′
, wherein Met′
is Mg, Zn, Al, Ga, B, Zr, or Ti;
A is Li, Ag, Cu, Na, Mn, Fe, Co, Ni, Cu, and Zn;
Y′
is F or S;
0≦
α
′
≦
0.2, 0≦
x′
≦
0.4, 0≦
α
≦
1, 0≦
β
≦
1, 0≦
γ
≦
1, 0≦
δ
≦
0.4, and 0≦
z′
≦
0.4; andthe redox shuttle is 2,5-di-(tert-butyl)-1,4-dimethoxybenzene.
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Specification