Currently,
there is an urgent demand for Ni-rich cathode materials with excellent
electrochemical properties under harsh conditions; however, obtaining
such materials is very challenging. Here, we propose an innovative
modification strategy that combines gradient phosphate polyanion doping
and dual-conductive layer (Li3PO4-PANI) coating.
The phosphate polyanion gradient doping can be described as acting
in a “support role” to optimize the crystal structure.
Moreover, the dual-conductive (Li3PO4-PANI)
layers can be described as acting in a “palisade role”
to inhibit side reactions and enhance the ionic/electronic conductivity
of the NCM cathode. For the NCM cathode, this strategy synergistically
achieves three main objectives: enhancement of structure stability,
improvement of the ionic/electronic conductivity of the interface,
and reduction of residual lithium salts. The modified NCM cathode
delivers superior cycling stability, with 81.4% capacity retention
after 100 cycles (4.5 V/55 °C), whereas the original NCM shows
only a quite low capacity retention (57.7%). Moreover, this strategy
also significantly improves the rate performance of the NCM cathode.
These results indicate that this innovative modification strategy
can be utilized to enhance the electrochemical performance of the
NCM cathode at 4.5 V and 55 °C.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.