The
design of the interfacial architecture between the electrode
and the current collector in lithium-ion batteries (LIB) plays a key
role in achieving ultrafast lithium storage kinetics with respect
to efficient charge transfer and cycle stability. However, in recent
years, despite considerable efforts in the structural and chemical
engineering of active materials (anode and cathode materials), interfacial
architectures between the electrode and the current collector have
received relatively insufficient attention in the case of ultrafast
LIBs. Here, the interface architecture of a micropatterned Al current
collector with a heteroatom-doped graphene interfacial layer is developed
using roll pressing and dip coating processes. The cathode electrode
fabricated with the resultant current collector offers increased contact
area with enhanced interfacial stability between the electrode and
the current collector because of micropatterns with heteroatom-doped
graphene formed on the current collector, leading to outstanding ultrafast
cycling capacity (105.8 mA h g–1) at 20 C. Furthermore,
at extremely high rate and long-term cycling performance, significant
ultrafast cycling stability (specific capacity of 87.1 mA h g–1 with capacity retention of 82.3% at 20 C after 1000
cycles) is noted. These improved ultrafast and ultra-stable performances
are explained in terms of the increased electron collection/provision
site with a high contact area between the electrode and the current
collector for enhanced ultrafast cycling capacity and the effective
corrosion prevention of the current collector with fast charge transfer
for ultrafast cycling stability.
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.