Abstract
Lithium ion batteries (LIBs) have been developed for extensive industrial applications in recent years. An important application of LIBs is in the electrification of automobiles. LIBs must possess superior electrochemical properties such as high life cycle, high energy and high power density. The electrodes could be improved using a two-layered cathode produced by a simultaneous slot-die coating and formulation design. There are two targets; the first one is improvement the performance through the variation conductive additives. The two-layered cathode with an upper layer having more carbon black and a lower layer having more graphite particles was found to give the best current discharge capacity and longer life cycle. In the other research target, the upper and lower layers in the film contained different compositions of binder with the upper one containing less binder than the lower one. During the rapid high temperature drying of the wet film, the uneven binder migration would be reduced to a more uniform binder network structure inside the dried composite cathode. The electrochemical performance of the lithium-ion battery, assembled with the two-layered Cathode drying under 150℃ was found similar the single-layered Cathode drying under 80℃. The lithium ion batteries made with two-layered cathode produced by a simultaneous slot-die coating and formulation design offered a new approach to give a better overall battery performance.