The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 21, 2010
Filed:
Aug. 16, 2007
Antoni S. Gozdz, Marlborough, MA (US);
Andrew C. Chu, Cambridge, MA (US);
Yet-ming Chiang, Framingham, MA (US);
Gilbert N. Riley, Jr., Marlborough, MA (US);
Antoni S. Gozdz, Marlborough, MA (US);
Andrew C. Chu, Cambridge, MA (US);
Yet-Ming Chiang, Framingham, MA (US);
Gilbert N. Riley, Jr., Marlborough, MA (US);
A123 Systems, Inc., Watertown, MA (US);
Abstract
A high capacity, high charge rate lithium secondary cell includes a high capacity lithium-containing positive electrode in electronic contact with a positive electrode current collector, said current collector in electrical connection with an external circuit, a high capacity negative electrode in electronic contact with a negative electrode current collector, said current collector in electrical connection with an external circuit, a separator positioned between and in ionic contact with the cathode and the anode, and an electrolyte in ionic contact with the positive and negative electrodes, wherein the total area specific impedance for the cell and the relative area specific impedances for the positive and negative electrodes are such that, during charging at greater than or equal to 4 C, the negative electrode potential is above the potential of metallic lithium. The current capacity per unit area of the positive and negative electrodes each are at least 3 mA-h/cm, the total area specific impedance for the cell is less than about 20 Ω-cm, and the positive electrode has an area specific impedance rand the negative electrode has an area specific impedance r, and wherein the ratio of rto ris at least about 10.