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Título : | Hydrogenated Amorphous Silicon- Based Nanomaterials as alternative electrodes to graphite for lithium-ion batteries |
Autor : | Barrio, Rocío González, Nieves Portugal, Álvaro Morant, Carmen Gandía, Jose Javier |
Palabras clave : | anodes; lithium-ion battery; amorphous silicon; amorphous silicon nanowires; energy storage |
Fecha de publicación : | 14-jun-2024 |
Resumen : | Graphite is the material most used as an electrode in commercial lithium-ion batteries.
On the other hand, it is a material with low energy capacity, and it is considered a raw critical
material given its large volume of use. In the current energy context, we must promote the search
for alternative materials based on elements that are abundant, sustainable and that have better
performance for energy storage. We propose thin materials based on silicon, which has a storage
capacity eleven times higher than graphite. Nevertheless, due to the high-volume expansion during
lithiation, it tends to crack, limiting the life of the batteries. To solve this problem, hydrogenated
amorphous silicon has been researched, in the form of thin film and nanostructures, since, due
to its amorphous structure, porosity and high specific surface, it could better absorb changes in
volume. These thin films were grown by plasma-enhanced chemical vapor deposition, and then the
nanowires were obtained by chemical etching. The compositional variations of films deposited at different
temperatures and the incorporation of dopants markedly influence the stability and longevity
of batteries. With these optimized electrodes, we achieved batteries with an initial capacity of
3800 mAhg1 and 82% capacity retention after 50 cycles |
URI : | http://documenta.ciemat.es/handle/123456789/3045 |
Aparece en las colecciones: | Artículos de Energía
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