The nanostructure of the Si–Al eutectic and its use in lithium batteries

Abstract

Abstract

Alloy Negative Electrodes for Li-Ion Batteries

“…20 Many groups have therefore proposed nanosized Si (n-Si) as an answer to capacity fade, and this approach has been the subject of a number of reviews. 18,168−170 Many implementations have been exemplified, where the n-Si is present as an independent component of the electrode and directly in contact with the binder/electrolyte, including Si nanoparticles, 171−182 Si nanowires, 117,183−190 nanotubes, 191−193 Si thin flakes, 194,195 Si nanopillars, 107,196,197 Si nanospheres, 198,199 nanostructured spheres, 200 and even combinations of nanoparticles and nanowires. 201 In other approaches, the n-Si is coated, encapsulated, or nanodispersed, typically in some form of carbon, thereby avoiding direct contact with the electrolyte.…”

Aluminum doping improves the energetics of lithium, sodium, and magnesium storage in silicon: A first-principles study

“…For example, Al-C nanoclustered anodes [18] and Al-doped Li 4 Ti 5 O 12 anodes [19] have been shown to exhibit significantly better cyclability and capacity compared to pure host materials. Similarly, experiments on Al-doped Si [20,21] and eutectic Al-Si (~88:12 wt%) [22] have also been reported, and have shown enhanced cyclability and capacity over pure Si and Al anodes, respectively. achievable by growing Si nanowires on a catalyst [23].…”

Microstructure Controlled Porous Silicon Particles as a High Capacity Lithium Storage Material via Dual Step Pore Engineering

“…[5b,7b,15] However, these methods are complicated, low yielding, environmentally harmful, and potentially low‐efficiency processes, hampering the utilization of porous Si materials in commercial LIBs . Recently, the dealloying of Si–metal alloys has been considered as a promising practical approach toward the mass production of porous Si microparticles . Pores can be generated by selectively leaching the metallic phase of Si‐containing alloys under nontoxic acidic conditions .…”

“…Recently, the dealloying of Si–metal alloys has been considered as a promising practical approach toward the mass production of porous Si microparticles . Pores can be generated by selectively leaching the metallic phase of Si‐containing alloys under nontoxic acidic conditions . Compared to several merits during the manufacturing process, the dealloyed Si products exhibit inferior Li storage properties.…”