Amorphization-induced energy loss of amorphous Si anodes for Li-ion batteries

Wang, Mingchao; Ye, Han; Zhai, Chenxi

doi:10.1016/j.scriptamat.2022.114958

Cited by 2 publications

(1 citation statement)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These two peaks appear in all cycles (see the 5th and 50th cycles as examples in Figure 10 ), indicating that these reactions are reversible. It is worth mentioning that battery E, which has a n-doped electrode with the highest polyhydride concentration (25.7%) shows the anodic peak 3 ( Figure 10 ) at a slightly higher voltage, the so-called overpotential [ 30 ], than battery A, which has a non-doped electrode, despite the fact that its conductivity is significantly higher. This indicates that a relatively high anodic overpotential could be induced when the polyhydride concentration is very high.…”

Section: Resultsmentioning

confidence: 99%

Fine-Tuning Intrinsic and Doped Hydrogenated Amorphous Silicon Thin-Film Anodes Deposited by PECVD to Enhance Capacity and Stability in Lithium-Ion Batteries

González,

García,

Morant

et al. 2024

Nanomaterials

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%