TY - JOUR
T1 - Sustainable Silica-Carbon Nanofiber Hybrid Composite Anodes for Lithium-Ion Batteries
AU - Beaucamp, Anne
AU - Calvo, Amaia Moreno
AU - Bowman, Deaglán
AU - Techouyeres, Clotilde
AU - Nulty, David Mc
AU - Lizundia, Erlantz
AU - Collins, Maurice N.
N1 - Publisher Copyright:
© 2024 The Author(s). Macromolecular Materials and Engineering published by Wiley-VCH GmbH.
PY - 2024/12
Y1 - 2024/12
N2 - Alternative anode materials with increased theoretical specific capacities are under scrutinity as a replacement to graphite in lithium-ion batteries (LiBs). Silicon oxides offer increased capacities compared to graphite and do not suffer the same level of material expansion as pure Si. Consequently, they are an intermediate commercial anode material, on the pathway toward pure Si anodes. In this study, stable Silica/carbon (SiO2/C) nanofibers are successfully developed from tetraethyl orthosilicate (TEOS) using poly(vinylpyrrolidone) (PVP). The fibers show excellent stability after calcination, with silica evenly dispersed within the fibers exhibiting a surface area of 327 m2 g−1. This study demonstrates that the electrochemical performance of SiO2/C composite anodes is significantly influenced by the silica content. SiO2/C composites with ≈68 at% SiO2 achieve reversible capacities of 315.6 and 300.9 mAh g−1, after the 2nd, and 800th cycles, respectively, at a specific current of 100 mA g−1, with a remarkable capacity retention of 95.3%. In a second stage, lignin is added as a potential nanostructuring agent. The addition of lignin to the sample reduces the amount of silica without significantly impacting its performance and stability. Tailoring the composition of SiO2/C composite anodes enables stable capacity retention over the course of hundreds of cycles.
AB - Alternative anode materials with increased theoretical specific capacities are under scrutinity as a replacement to graphite in lithium-ion batteries (LiBs). Silicon oxides offer increased capacities compared to graphite and do not suffer the same level of material expansion as pure Si. Consequently, they are an intermediate commercial anode material, on the pathway toward pure Si anodes. In this study, stable Silica/carbon (SiO2/C) nanofibers are successfully developed from tetraethyl orthosilicate (TEOS) using poly(vinylpyrrolidone) (PVP). The fibers show excellent stability after calcination, with silica evenly dispersed within the fibers exhibiting a surface area of 327 m2 g−1. This study demonstrates that the electrochemical performance of SiO2/C composite anodes is significantly influenced by the silica content. SiO2/C composites with ≈68 at% SiO2 achieve reversible capacities of 315.6 and 300.9 mAh g−1, after the 2nd, and 800th cycles, respectively, at a specific current of 100 mA g−1, with a remarkable capacity retention of 95.3%. In a second stage, lignin is added as a potential nanostructuring agent. The addition of lignin to the sample reduces the amount of silica without significantly impacting its performance and stability. Tailoring the composition of SiO2/C composite anodes enables stable capacity retention over the course of hundreds of cycles.
KW - Li-ion batteries
KW - Si/C hybrid nanofibres
KW - anode
KW - capacity retention
KW - lignin
KW - templating
UR - http://www.scopus.com/inward/record.url?scp=85199695220&partnerID=8YFLogxK
U2 - 10.1002/mame.202400202
DO - 10.1002/mame.202400202
M3 - Article
AN - SCOPUS:85199695220
SN - 1438-7492
VL - 309
JO - Macromolecular Materials and Engineering
JF - Macromolecular Materials and Engineering
IS - 12
M1 - 2400202
ER -
