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 the thermal decomposition end temperature is T2° C., one or more signals are present for any of the mass number of 81, 100, 132, and 200 in a thermal decomposition mass analysis between thermal decomposition temperatures of T1 and T2. When a signal area of the mass spectrum in the range of T1-100° C. or higher but lower than T1° C. is X, and a signal area of the mass spectrum in the range of T1 or higher but the same or lower than T2° C. is Y, the X and Y satisfy a relation of X≦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 the thermal decomposition end temperature is T2° C., one or more signals are present for any of the mass number of 81, 100, 132, and 200 in a thermal decomposition mass analysis between thermal decomposition temperatures of T1 and T2; and when a signal area of the mass spectrum in the range of T1-100° C. or higher but lower than T1° C. is X, and a signal area of the mass spectrum in the range of T1 or higher but the same or lower than T2° C. is Y, the X and Y satisfy a relation of X≦Y, wherein 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 signal area of mass spectrum indicates, in the mass spectrum of the binder, signal area of the mass number with maximum signal area between T1 and T2 among one or more signals selected from the mass number of 81, 100, 132, and 200.