Invention Grant
- Patent Title: Lithium secondary cell with high charge and discharge rate capability
- Patent Title (中): 具有高充放电能力的锂二次电池
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Application No.: US11839947Application Date: 2007-08-16
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Publication No.: US07799461B2Publication Date: 2010-09-21
- Inventor: Antoni S. Gozdz , Andrew C. Chu , Yet-Ming Chiang , Gilbert N. Riley, Jr.
- Applicant: Antoni S. Gozdz , Andrew C. Chu , Yet-Ming Chiang , Gilbert N. Riley, Jr.
- Applicant Address: US MA Watertown
- Assignee: A123 Systems, Inc.
- Current Assignee: A123 Systems, Inc.
- Current Assignee Address: US MA Watertown
- Agency: Wilmer Cutler Pickering Hale and Dorr LLP
- Main IPC: H01M10/44
- IPC: H01M10/44

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/cm2, the total area specific impedance for the cell is less than about 20 Ω-cm2, and the positive electrode has an area specific impedance r1 and the negative electrode has an area specific impedance r2, and wherein the ratio of r1 to r2 is at least about 10.
Public/Granted literature
- US20080169790A1 LITHIUM SECONDARY CELL WITH HIGH CHARGE AND DISCHARGE RATE CAPABILITY Public/Granted day:2008-07-17
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