Lithium ion battery and capacitor hybridization in material and electrode level
AssigneeGM Global Technology Operations LLC
InventorsHaijing Liu, Zhiqiang Yu, Dewen Kong, Meiyuan Wu
Life of this patent
Estimating the term…
Abstract
At least one of the anode and cathode of a lithium-ion processing electrochemical cell are prepared with a layer of mixed partides of both active lithium battery electrode materials and lithium ion adsorbing capacitor materials, or with co-extensive, contiguous layers of battery electrode particles in one layer and capacitor particles in the adjoining layer. The proportions of active battery electrode particles and active capacitor particles in one or both of the electrodes are predetermined to provide specified energy density (Wh/kg) and power density (W/kg) properties of the cell for its intended application.
Claims20
An electrochemical cell comprising an anode, a cathode, and an electrolyte solution containing a lithium electrolyte salt dissolved in a non-aqueous liquid solvent in which the electrolyte salt produces lithium cations and associated anions;
- the electrochemical cell being further characterized in that;
- the anode and cathode of the electrochemical cell each contain a layer of resin-bonded particles of an electrode material bonded to at least one side of a current collector foil, the resin-bonded electrode material particles being capable of intercalating lithium from the electrolyte solution and de-intercalating lithium into the electrolyte solution so that such electrode material particles in the anode and cathode can function as a lithium-ion battery cell;
- and
- at least one of the anode and cathode of the electrochemical cell also containing particles of an electrode material that are capable of adsorbing lithium cations from the electrolyte solution and desorbing lithium cations into the electrolyte solution to function as a capacitor, such electrode material capacitor particles being mixed with the battery electrode material particles in the same electrode resin-bonded layer or being formed in a separate porous layer, coextensive and lying against a layer of battery electrode particles, the combination of the amounts and proportions of battery particles and capacitor particles present in the anode and the cathode each providing equal electrochemical capacities in ampere-hours at each electrode, the amounts and proportions of battery particles and capacitor particles in the anode and/or cathode further being predetermined to provide a specified hybridized energy density (Wh/kg) and power density (W/kg) for the electrochemical cell.
A method of forming at least one of an anode and cathode for an electrochemical cell comprising an anode, a cathode, and an electrolyte solution containing a lithium electrolyte salt dissolved in a non-aqueous liquid solvent in which the electrolyte salt produces lithium cations and associated anions;
- the method comprising:
- applying particles of active anode material as a porous layer of anode material to at least one side of an anode current collector foil for the electrochemical cell, the particles of active anode material being composed for intercalating and de-intercalating lithium ions from the lithium ion containing electrolyte solution so that that such electrode material particles can function as a lithium-ion battery cell;
- applying particles of active cathode material as a porous layer of cathode material to at least one side of a cathode current collector foil, the particles of active cathode material being composed for intercalating and de-intercalating lithium ions from the lithium ion containing electrolyte solution;
- and
- also applying particles of an active electrode material, which are composed to adsorp lithium ions from the electrolyte solution and desorp lithium ions into the electrolyte solution in the nature of a capacitor, to at least one of the anode current collector foil and cathode current collector foil, the combination of the amounts and proportions of battery particles and capacitor particles in the anode and the cathode each providing equal electrochemical capacities in ampere-hours, the amounts and proportions of battery particles and capacitor particles in the anode and/or cathode further being predetermined to provide a specified hybridized energy density (Wh/kg) and power density (W/kg) for the electrochemical cell.
Dependencies are inferred from the claim text.