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Title:
METHOD AND APPARATUS FOR CHARACTERIZING HIGH-ENERGY ELECTROCHEMICAL CELLS USING POWER FUNCTIONS OBTAINED FROM CALORIMETRY
Document Type and Number:
WIPO Patent Application WO2001050543
Kind Code:
A9
Abstract:
Characterizing electrochemical cell components and a response of an electrochemical cell to a specified operating condition involves preparing a sample of an electrode material in contact with an electrolyte. Self-heating, power-temperature or power-time data is obtained for the sample using a calorimetry technique, such as by use of an accelerating rate calorimetry technique or a differential scanning calorimetry technique. A power function is developed for the sample using the self-heating, power-temperature or power-time data. The power function is representative of thermal power per unit mass of the sample as a function of temperature and amount of reactant remaining from a reaction of the sample electrode material and electrolyte. A first power function is developed that characterizes a reaction between the cathode material and the electrolyte in terms of thermal power per unit mass of a cathode sample material, and a second power function is developed that characterizes a reaction between the anode material and the electrolyte in terms of thermal power per unit mass of the anode sample material. An electrode material sample from which a power function is developed is prepared using less than about 100 grams of the electrode material, such as between about 1 and 10 grams, but may be as little as between about 1 milligram and 1 gram. A computer system and computer-readable medium are provided to electronically design and test cells of arbitrary size and shape using power functions developed for individual electrode/electrolyte combinations.

Inventors:
DAHN JEFFERY R
MACNEIL DEAN D
HATCHARD TIMOTHY D
Application Number:
PCT/US2000/022926
Publication Date:
January 30, 2003
Filing Date:
August 21, 2000
Export Citation:
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Assignee:
3M INNOVATIVE PROPERTIES CO (US)
International Classes:
G01N25/20; G01N25/48; H01M10/42; H01M10/48; (IPC1-7): H01M10/48; H01M10/42; G01N25/48; G01R31/36
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