ELECTRODE FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, NONAQUEOUS ELECTROLYTE SECONDARY BATTERY, AND BATTERY PACK

摘要

An electrode for a nonaqueous electrolyte secondary battery of an embodiment has an active material layer containing an active material and a binder containing fluorine, and a current collector bound to the active material layer. When a thermal decomposition start temperature of the binder is T1° C. and a thermal decomposition end temperature of the binder is T2° C., one or more peaks are present in an ion chromatogram of any mass number selected at least from 81, 100, 132, and 200 in a thermal decomposition gas chromatography mass analysis at the thermal decomposition temperature of (T1+T2)/2° C. When a peak area at T1° C. is X, and a peak area at T2° C. is Y, the X and Y satisfy a relation of 2X≧Y.

主权项

1. An electrode for a nonaqueous electrolyte secondary battery comprising:
an active material layer containing an active material, and a binder containing fluorine; and a current collector bound to the active material layer, wherein, when a thermal decomposition start temperature of the binder is T1° C. and a thermal decomposition end temperature of the binder is T2° C.; one or more peaks are present in an ion chromatogram of any mass number selected at least from 81, 100, 132, and 200 in a thermal decomposition gas chromatography mass analysis at the thermal decomposition temperature of (T1+T2)/2° C.; where a peak area at T1° C. is X, and a peak area at T2° C. is Y, the X and Y satisfy a relation of 2X≧Y; the thermal decomposition start temperature of the binder indicates, in a main weight loss process, a temperature at which 5% of the weight loss portion in the weight loss process is reduced when the binder is analyzed by thermogravimetric analysis; the thermal decomposition end temperature of the binder indicates, in a main weight loss process, a temperature at which 95% of the weight loss portion in the weight loss process is reduced when the binder is analyzed by thermogravimetric analysis; and the peak area indicates peak area of the mass number giving the maximum area in an ion chromatography extracted at the mass number of 81, 100, 132, and 200 according to thermal decomposition gas chromatography mass analysis at the thermal decomposition temperature (T1+T2)/2° C. of the binder.