Separator for a high energy rechargeable lithium battery
DC CAFC
First Claim
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1. 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.
6 Assignments
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6 Petitions
Reexamination
Accused Products
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.
227 Citations
12 Claims
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1. A separator for a high energy rechargeable lithium battery comprises:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 11)
an anode containing lithium metal or lithium-alloy or a mixtures of lithium metal and/or lithium alloy and another material;
a cathode;
a separator according to claims 1-10 disposed between said anode and said cathode; and
an electrolyte in ionic communication with said anode and said cathode via said separator.
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7. A separator for a high energy rechargeable lithium battery comprises:
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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. - View Dependent Claims (8, 9, 10)
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12. A separator for an energy storage system comprises:
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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.
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Specification
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Litigation Data
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Current AssigneeCelgard LLC (Asahi Kasei Corporation)
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Original AssigneeCelgard LLC (Asahi Kasei Corporation)
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InventorsZhang, Zhengming
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Primary Examiner(s)Ryan, Patrick
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Assistant Examiner(s)Martin, Angela J
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Application NumberUS09/546,266Time in Patent Office855 DaysField of Search429/247, 429/248, 429/249, 429/251, 429/252, 429/231.95US Class Current429/251CPC Class CodesH01M 10/052 Li-accumulatorsH01M 50/414 Synthetic resins, e.g. ther...H01M 50/417 PolyolefinsH01M 50/42 Acrylic resinsH01M 50/426 Fluorocarbon polymersH01M 50/443 Particulate materialH01M 50/446 Composite material consisti...H01M 50/451 comprising layers of only o...H01M 50/457 comprising three or more la...H01M 50/491 PorosityY02E 60/10 Energy storage using batteries
