Safe positive temperature coefficient composite cathode for lithium ion battery

► The Tc of PTC material is about 90 °C, much lower than the previously reported. ► They can endow the electrode with a current limiting effect at around 90 °C. ► It will not impose any negative effect on its electrochemical property. ► PTC composite also can be used with LiCoO2 or LiCo1/3Mn1/3Ni1/3O2, etc.