1 research outputs found
Influence of Binders, Carbons, and Solvents on the Stability of Phosphorus Anodes for Li-ion Batteries
Phosphorus
(P) is an abundant element that exhibits one of the
highest gravimetric and volumetric capacities for Li storage, making
it a potentially attractive anode material for high capacity Li-ion
batteries. However, while phosphorus carbon composite anodes have
been previously explored, the influence of the inactive materials
on electrode cycle performance is still poorly understood. Here, we
report and explain the significant impacts of polymer binder chemistry,
carbon conductive additives, and an under-layer between the Al current
collector and ball milled P electrodes on cell stability. We focused
our study on the commonly used polyvinylidene fluoride (PVDF) and
polyÂ(acrylic acid) (PAA) binders as well as exfoliated graphite (ExG)
and carbon nanotube (CNT) additives. The mechanical properties of
the binders were found to change drastically because of interactions
with both the slurry and electrolyte solvents, significantly effecting
the electrochemical cycle stability of the electrodes. Binder adhesion
was also found to be critical in achieving stable electrochemical
cycling. The best anodes demonstrated ∼1400 mAh/g-P gravimetric
capacity after 200 cycles at C/2 rates in Li half cells