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Título : | Fine-tuning intrinsic and doped hydrogenated amorphous silicon thin-film anodes deposited by PECVD for enhanced capacity and stability in lithium-ion batteries |
Autor : | González, Nieves Barrio, Rocío García, Tomás Morant, Carmen |
Palabras clave : | anodes; lithium-ion battery; amorphous silicon; energy storage |
Fecha de publicación : | 14-jun-2024 |
Resumen : | Silicon is a promising alternative to graphite as an anode material in lithium-ion batteries,
thanks to its high theoretical lithium storage capacity. Despite these high expectations, silicon anodes
still face significant challenges, such as premature battery failure caused by huge volume changes
during charge–discharge processes. To solve this drawback, using amorphous silicon as a thin film
offers several advantages: its amorphous nature allows for better stress mitigation and it can be
directly grown on current collectors for material savings and improved Li-ion diffusion. Furthermore,
its conductivity is easily increased through doping during its growth. In this work, we focused
on a comprehensive study of the influence of both electrical and structural properties of intrinsic
and doped hydrogenated amorphous silicon (aSi:H) thin-film anodes on the specific capacity and
stability of lithium-ion batteries. This study allows us to establish that hydrogen distribution in the
aSi:H material plays a pivotal role in enhancing battery capacity and longevity, possibly masking the
significance of the conductivity in the case of doped electrodes. Our findings show that we were able
to achieve high initial specific capacities (3070 mAhg-1 at the 10th cycle), which can be retained at
values higher than those of graphite for a significant number of cycles (>120 cycles), depending on
the structural properties of the aSi:H films. To our knowledge, this is the first comprehensive study of
the influence of these properties of thin films with different doping levels and hydrogen distributions
on their optimization and use as anodes in lithium-ion batteries |
URI : | http://documenta.ciemat.es/handle/123456789/3048 |
Aparece en las colecciones: | Artículos de Energía
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