We investigate the effects of thermally sensitive binder (TSB) on the temperature increase of lithium-ion battery (LIB) coin cell subjected to severe mechanical abuse. The TSB is poly(vinylidenefluoride-co-hexafluoropropylene) (PVDF-HFP), similar to conventional poly(vinylidenefluoride) (PVDF) binder but with a significant hexafluoropropylene (HFP) content. The testing data show that by using TSB, the peak temperature increase of nail-penetrated LIB coin cell can be reduced by 20% to 40%, attributed to the softening of TSB that begins from similar to 80 degrees C. The cycling performance of the LIB cells is also characterized. This research sheds light on the development of thermal-runaway mitigation techniques.