Nanoscale Heterogeneity of Multilayered Si Anodes with Embedded Nanoparticle Scaffolds for Li‐Ion Batteries

A new approach on the synthesis of Si anodes for Li‐ion batteries is reported, combining advantages of both nanoparticulated and continuous Si films. A multilayered configuration prototype is proposed, comprising amorphous Si arranged in nanostructured, mechanically heterogeneous films, interspersed...

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Autores principales: Haro, Marta, Singh, Vidyadhar, Steinhauer, Stephan, Toulkeridou, Evropi, Grammatikopoulos, Panagiotis, Sowwan, Mukhles
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5644243/
https://www.ncbi.nlm.nih.gov/pubmed/29051859
http://dx.doi.org/10.1002/advs.201700180
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author Haro, Marta
Singh, Vidyadhar
Steinhauer, Stephan
Toulkeridou, Evropi
Grammatikopoulos, Panagiotis
Sowwan, Mukhles
author_facet Haro, Marta
Singh, Vidyadhar
Steinhauer, Stephan
Toulkeridou, Evropi
Grammatikopoulos, Panagiotis
Sowwan, Mukhles
author_sort Haro, Marta
collection PubMed
description A new approach on the synthesis of Si anodes for Li‐ion batteries is reported, combining advantages of both nanoparticulated and continuous Si films. A multilayered configuration prototype is proposed, comprising amorphous Si arranged in nanostructured, mechanically heterogeneous films, interspersed with Ta nanoparticle scaffolds. Particular structural features such as increased surface roughness, nanogranularity, and porosity are dictated by the nanoparticle scaffolds, boosting the lithiation process due to fast Li diffusion and low electrode polarization. Consequently, a remarkable charge/discharge speed is reached with the proposed anode, in the order of minutes (1200 mAh g(−1) at 10 C). Moreover, nanomechanical heterogeneity self‐limits the capacity at intermediate charge/discharge rates; as a consequence, exceptional cycleability is observed at 0.5 C, with 100% retention over 200 cycles with 700 mAh g(−1). Higher capacity can be obtained when the first cycles are performed at 0.2 C, due to the formation of microislands, which facilitate the swelling of the active Si. This study indicates a method to tune the mechanical, morphological, and electrochemical properties of Si electrodes via engineering nanoparticle scaffolds, paving the way for a novel design of nanostructured Si electrodes for high‐performance energy storage devices.
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spelling pubmed-56442432017-10-19 Nanoscale Heterogeneity of Multilayered Si Anodes with Embedded Nanoparticle Scaffolds for Li‐Ion Batteries Haro, Marta Singh, Vidyadhar Steinhauer, Stephan Toulkeridou, Evropi Grammatikopoulos, Panagiotis Sowwan, Mukhles Adv Sci (Weinh) Full Papers A new approach on the synthesis of Si anodes for Li‐ion batteries is reported, combining advantages of both nanoparticulated and continuous Si films. A multilayered configuration prototype is proposed, comprising amorphous Si arranged in nanostructured, mechanically heterogeneous films, interspersed with Ta nanoparticle scaffolds. Particular structural features such as increased surface roughness, nanogranularity, and porosity are dictated by the nanoparticle scaffolds, boosting the lithiation process due to fast Li diffusion and low electrode polarization. Consequently, a remarkable charge/discharge speed is reached with the proposed anode, in the order of minutes (1200 mAh g(−1) at 10 C). Moreover, nanomechanical heterogeneity self‐limits the capacity at intermediate charge/discharge rates; as a consequence, exceptional cycleability is observed at 0.5 C, with 100% retention over 200 cycles with 700 mAh g(−1). Higher capacity can be obtained when the first cycles are performed at 0.2 C, due to the formation of microislands, which facilitate the swelling of the active Si. This study indicates a method to tune the mechanical, morphological, and electrochemical properties of Si electrodes via engineering nanoparticle scaffolds, paving the way for a novel design of nanostructured Si electrodes for high‐performance energy storage devices. John Wiley and Sons Inc. 2017-08-08 /pmc/articles/PMC5644243/ /pubmed/29051859 http://dx.doi.org/10.1002/advs.201700180 Text en © 2017 The Authors. Published by WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim This is an open access article under the terms of the Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Full Papers
Haro, Marta
Singh, Vidyadhar
Steinhauer, Stephan
Toulkeridou, Evropi
Grammatikopoulos, Panagiotis
Sowwan, Mukhles
Nanoscale Heterogeneity of Multilayered Si Anodes with Embedded Nanoparticle Scaffolds for Li‐Ion Batteries
title Nanoscale Heterogeneity of Multilayered Si Anodes with Embedded Nanoparticle Scaffolds for Li‐Ion Batteries
title_full Nanoscale Heterogeneity of Multilayered Si Anodes with Embedded Nanoparticle Scaffolds for Li‐Ion Batteries
title_fullStr Nanoscale Heterogeneity of Multilayered Si Anodes with Embedded Nanoparticle Scaffolds for Li‐Ion Batteries
title_full_unstemmed Nanoscale Heterogeneity of Multilayered Si Anodes with Embedded Nanoparticle Scaffolds for Li‐Ion Batteries
title_short Nanoscale Heterogeneity of Multilayered Si Anodes with Embedded Nanoparticle Scaffolds for Li‐Ion Batteries
title_sort nanoscale heterogeneity of multilayered si anodes with embedded nanoparticle scaffolds for li‐ion batteries
topic Full Papers
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5644243/
https://www.ncbi.nlm.nih.gov/pubmed/29051859
http://dx.doi.org/10.1002/advs.201700180
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