1 research outputs found
Systematic Investigation of the Alucone-Coating Enhancement on Silicon Anodes
Polyvinylidene
fluoride (PVDF) is the most popular binder in commercial lithium-ion
batteries but is incompatible with a silicon (Si) anode because it
fails to maintain the mechanical integrity of the Si electrode upon
cycling. Herein, an alucone coating synthesized by molecular layer
deposition has been applied on the laminated electrode fabricated
with PVDF to systematically study the sole impact of the surface modification
on the electrochemical and mechanical properties of the Si electrode,
without the interference of other functional polymer binders. The
enhanced mechanical properties of the coated electrodes, confirmed
by mechanical characterization, can help accommodate the repeated
volume fluctuations, preserve the electrode structure during electrochemical
reactions, and thereby, leading to a remarkable improvement of the
electrochemical performance. Owing to the alucone coating, the Si
electrodes achieve highly reversible cycling performance with a specific
capacity of 1490 mA h g<sup>–1</sup> (0.90 mA h cm<sup>–2</sup>) as compared to 550 mA h g<sup>–1</sup> (0.19 mA h cm<sup>–2</sup>) observed in the uncoated Si electrode. This research
elucidates the important role of surface modification in stabilizing
the cycling performance and enabling a high level of material utilization
at high mass loading. It also provides insights for the future development
of Si anodes