Method for predicting discharge capacity and operating voltage o

Details Method for predicting discharge capacity and operating voltage o Method for predicting discharge capacity and operating voltage o

1996-12-19

2000-03-07

Nuzzolillo, Maria

Chemistry: electrical current producing apparatus, product, and

With measuring, testing, or indicating means

429 10, H01M 1048

Patent

active

060337982

ABSTRACT:
A method of determining the charge and/or discharge capacities of non-aqueous batteries with an operating voltage of about 4 volts, is provided including determining an inverse molar susceptibility value at each of a plurality of different temperatures for a plurality of lithium manganese spinel oxide cathode materials having different respective Mn valencies; plotting the inverse molar susceptibility values against temperatures for each of the plurality of lithium manganese spinel oxide cathode materials; determining values of at least one of two paramagnetic parameters, Weiss temperature and effective magnetic moment, by obtaining the temperature dependence of the above inverse molar susceptibility from a plot derived from the Curie-Weiss law, the Weiss temperature corresponding to a temperature value extrapolated to a zero point of the inverse molar susceptibility and the effective magnetic moment being obtainable from the gradient value of the plot; producing plural rechargeable lithium batteries in which lithium manganese spinel oxides with well-defined Mn valencies are used as cathode materials, and finding at least one of the charge or discharge capacities around 4V for each of the batteries; providing at least one correlation curve between the above-found charge and/or discharge capacities and the above-found at least one paramagnetic parameter value; and obtaining charge and/or discharge capacities for a rechargeable lithium battery containing a lithium manganese spinel oxide whose charge and/or discharge capacities are being sought from the at lest one determined paramagnetic parameter value using the at least one correlation curve. A method of determining the charge and/or discharge capacities of non-aqueous batteries with an operating voltage of about 4 volts, is also provided which includes determining a spontaneous magnetization value for each of a plurality of lithium manganese spinel oxide cathode materials having a different respective Mn valency by determining a magnetization value of each of a plurality of magnetic fields at a constant temperature to obtain and thereafter use a correlation curve.

REFERENCES:
B.D. Cullity, "Introduction to Magnetic Materials", Addison-Wesley Publishing, pp. 117-135. (no month available), 1972.
C. Masquelier et al., J. of Solid State Chemistry, vol. 123, pp. 255-266 (1996); "Chemical and Magnetic Characterization of Spinel Materials in the LiMn.sub.2 O.sub.4 -Li.sub.2 Mn.sub.4 O.sub.9 -Li.sub.4 Mn.sub.5 O.sub.12 System" (no month available).

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