Separator for a high energy rechargeable lithium battery
AssigneeCelgard, LLC
InventorZhengming Zhang
Life of this patent
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Abstract
The instant invention is directed to a separator for a high energy rechargeable lithium battery and the corresponding battery. The separator includes a ceramic composite layer and a polymeric microporous layer. The ceramic layers includes a mixture of inorganic particles and a matrix material. The ceramic layer is adapted, at least, to block dendrite growth and to prevent electronic shorting. The polymeric layer is adapted, at least, to block ionic flow between the anode and the cathode in the event of thermal runaway.
Claims12
A separator for a high energy rechargeable lithium battery comprises:
- at least one ceramic composite layer, said layer including a mixture of inorganic particles in a matrix material;
- said layer being adapted to at least block dendrite growth and to prevent electronic shorting;
- and
- at least one polyolefinic microporous layer, said layer being adapted to block ionic flow between an anode and a cathode.
A separator for a high energy rechargeable lithium battery comprises:
- at least one ceramic composite layer or coating, said layer including a mixture of 20-95% by weight of inorganic particles selected from the group consisting of SiO2, Al2O3, CaCO3, TiO2, SiS2, SiPO4 and the like, and mixtures thereof, and 5-80% by weight of a matrix material selected from the group consisting of polyethylene oxide, polyvinylidene fluoride, polytetrafluoroethylene, copolymers of the foregoing, and mixtures thereof;
- and
- at least one polyolefinic microporous layer having a porosity in the range of 20-80%, an average pore size in the range of 0.02 to 2 microns, and a Gurley Number in the range of 15 to 150 sec.
A separator for an energy storage system comprises:
- at least one ceramic composite layer or coating, said layer including a mixture of 20-95% by weight of inorganic particles selected from the group consisting of SiO2, Al2O3, CaCO3, TiO2, SiS2, SiPO4 and the like, and mixtures thereof, and 5-80% by weight of a matrix material selected from the group consisting of polyethylene oxide, polyvinylidene fluoride, polytetrafluoroethylene, copolymers of the foregoing, and mixtures thereof, said layer being adapted to at least block dendrite growth and to prevent electronic shorting;
- and
- at least one polyolefinic microporous layer having a porosity in the range of 20-80%, an average pore size in the range of 0.02 to 2 microns, and a Gurley Number in the range of 15 to 150 sec, said layer being adapted to block ionic flow between an anode and a cathode.
Dependencies are inferred from the claim text.