Composite electrode including current collector
First Claim
1. In a rechargeable lithium battery having a negative electrode, a positive electrode, a metallic current collector adjacent each electrode and a non-aqueous electrolyte, the improvement comprising, that an organic polymer laminate having two opposing faces and rendered electrically conductive by embedded electrically conductive particles, is inserted between at least one of the electrodes and the adjacent metallic current collector, thereby forming a composite electrode including said positive or said negative electrode, comprising said electrically conductive organic polymer laminate having one face in contact with said metallic current collector and another face with said positive or said negative electrode, said electrically conductive organic polymer laminate having a thickness, said thickness and said opposing faces defining a total volume, said electrically conductive organic polymer laminate having a positive temperature coefficient of resistivity, a resistivity switch temperature Trs, between 75 and 120°
- C., said electrically conductive organic polymer laminate being capable of reversible resistivity change of at least 2 orders of magnitude within a 5°
temperature band of said Trs, and wherein said electrically conductive organic polymer is capable of having said reversible resistivity change in a portion of the total volume of said electrically conductive organic polymer laminate.
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Accused Products
Abstract
A composite electrode for a rechargeable lithium battery is described. The composite electrode has a metallic current collector in contact with an electrically conducting organic polymer laminate made of a blended and annealed polymeric mixture containing fine carbon particles, and coated with an electrode-active substance bearing layer. The conducting polymer is capable of reversible resistivity changes of several orders of magnitude in only a portion of the laminate, thereby reducing locally excessive current flow and over-heating in the rechargeable lithium battery.
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Citations
17 Claims
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1. In a rechargeable lithium battery having a negative electrode, a positive electrode, a metallic current collector adjacent each electrode and a non-aqueous electrolyte, the improvement comprising, that an organic polymer laminate having two opposing faces and rendered electrically conductive by embedded electrically conductive particles, is inserted between at least one of the electrodes and the adjacent metallic current collector, thereby forming a composite electrode including said positive or said negative electrode, comprising said electrically conductive organic polymer laminate having one face in contact with said metallic current collector and another face with said positive or said negative electrode, said electrically conductive organic polymer laminate having a thickness, said thickness and said opposing faces defining a total volume, said electrically conductive organic polymer laminate having a positive temperature coefficient of resistivity, a resistivity switch temperature Trs, between 75 and 120°
- C., said electrically conductive organic polymer laminate being capable of reversible resistivity change of at least 2 orders of magnitude within a 5°
temperature band of said Trs, and wherein said electrically conductive organic polymer is capable of having said reversible resistivity change in a portion of the total volume of said electrically conductive organic polymer laminate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- C., said electrically conductive organic polymer laminate being capable of reversible resistivity change of at least 2 orders of magnitude within a 5°
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14. A rechargeable lithium battery comprising:
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i) a first metallic current collector; ii) a composite positive electrode comprising a first organic polymer laminate rendered electrically conductive by embedded electrically conductive particles, said first electrically conductive organic polymer laminate having a first thickness and a first pair of faces, said first thickness and said first pair of faces defining a first total volume, wherein said first electrically conductive organic polymer laminate has a positive temperature coefficient of resistivity, a resistivity switch temperature Trs, between 75 and 120°
C., said first electrically conductive organic polymer laminate being capable of reversible resistivity change of at least 2 orders of magnitude within a 5°
temperature band of said Trs, and wherein said first electrically conductive organic polymer is capable of having said reversible resistivity change in a portion of said first total volume of said first electrically conductive organic polymer laminate, one of said first pair of faces being in contact with said first metallic current collector, and the other of said first pair of faces of said first electrically conductive organic polymer laminate being in contact with a positive electrode further comprising a positive active substance, thereby forming a composite positive electrode including a positive electrode and a metallic current collector;iii) a non-aqueous lithium ion conducting electrolyte having a third pair of faces; and iv) a composite negative electrode comprising a second organic polymer laminate rendered electrically conductive by embedded electrically conductive particles, said second electrically conductive organic polymer laminate having a second thickness and a second pair of faces, said second thickness and said second pair of faces defining a second total volume, wherein said second electrically conductive organic polymer laminate has a positive temperature coefficient of resistivity, a resistivity switch temperature Trs, between 75 and 120°
C., said second electrically conductive organic polymer laminate being capable of reversible resistivity change of at least 2 orders of magnitude within a 5°
temperature band of said Trs, and wherein said second electrically conductive organic polymer is capable of having said reversible resistivity change in a portion of said second total volume of said second electrically conductive organic polymer laminate, one of said second pair of faces of said second electrically conductive organic polymer laminate being in contact with a negative electrode comprising a negative active substance, and the other of said second pair of faces is in contact with a second metallic current collector, thereby forming a composite negative electrode including a negative electrode and a second metallic current collector. - View Dependent Claims (15, 16, 17)
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Specification