Integrated polyaniline-coated CFx cathode materials with enhanced electrochemical capabilities for Li/CFx primary battery

Abstract

A core/shell structure CFx (x = 1)/polyaniline integral composites are synthesized via an in situ chemical oxidative polymerization method at 0 °C.The effects of the amount of aniline monomers (CFx powers: aniline monomers = 4:1, 2:1, 4:3 in a weight ratio marked CFx4:1, CFx2:1, CFx4:3 separately) are studied. The polyaniline is evenly coated on the surface of graphite fluoride and the appropriate thickness of polyaniline layer is about 160~180 nm. Synthetic materials discharge rate can reach up to 8 C, which is much higher than most of the currently available CFx cathodes and the pristine CFx. CFx2:1 and CFx4:3 discharge capacity still keep more than 700 mAh g-1 at 6 C and the power density can reach up to more than 10000 W Kg-1 at 8 C. All these can be attributed to the conductive polyaniline coating, which provides the exterior connectivity between particles for facile electron conduction, resulting in high-rate performance, high discharge capacity, high discharge voltage and high power density.