Tailored silicon nanostructures in hydrogel-derived conductive binders: Role of size, structure, and surface chemistry in enhancing Li-ion battery performance

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F25%3A43932700" target="_blank" >RIV/60461373:22310/25:43932700 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22340/25:43932700

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0378775325024565?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0378775325024565?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jpowsour.2025.238620" target="_blank" >10.1016/j.jpowsour.2025.238620</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Tailored silicon nanostructures in hydrogel-derived conductive binders: Role of size, structure, and surface chemistry in enhancing Li-ion battery performance

Popis výsledku v původním jazyce

Silicon (Si) is a promising anode material for Li-ion batteries (LIBs), but its practical application is limited by volume expansion during lithiation/delithiation, leading to poor cycling stability. While Si nanostructuring mitigates this issue, it remains only a partial solution.This study systematically investigates the effects of Si particle size (6, 20, 55, or 100 nm), surface chemistry (type and degree of oxidation), and solid-state properties (amorphous vs. crystalline) on the electrochemical performance of Si-based anodes using a three-dimensional (3D) crosslinked polypyrrole (PPy) binder. In situ PPy polymerization around Si nanoparticles forms a 3D interconnected conductive network within the PPy/Si anodes, effectively accommodating volume changes and maintaining electrical contact during the galvanostatic cycling. The particle size dependence shows that larger Si nanoparticles provide higher initial charge capacity (2975 mAh/g), whereas smaller ones improve cycling stability (85 % capacity retention after 100 cycles). Amorphous Si exhibits significantly lower specific capacity but superior capacity retention (∼100 % after 100 cycles) compared to crystalline Si. Cyclic voltammetry and electrochemical impedance spectroscopy demonstrate that integrating 6 or 20 nm Si nanocrystals into a 3D crosslinked PPy enhances anode performance. These findings highlight the importance of optimizing Si properties in designing conductive hydrogel-derived anodes for high-performance LIBs. © 2025 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license ( http://creativecommons.org/licenses/by/4.0/).

Název v anglickém jazyce

Tailored silicon nanostructures in hydrogel-derived conductive binders: Role of size, structure, and surface chemistry in enhancing Li-ion battery performance

Popis výsledku anglicky

Silicon (Si) is a promising anode material for Li-ion batteries (LIBs), but its practical application is limited by volume expansion during lithiation/delithiation, leading to poor cycling stability. While Si nanostructuring mitigates this issue, it remains only a partial solution.This study systematically investigates the effects of Si particle size (6, 20, 55, or 100 nm), surface chemistry (type and degree of oxidation), and solid-state properties (amorphous vs. crystalline) on the electrochemical performance of Si-based anodes using a three-dimensional (3D) crosslinked polypyrrole (PPy) binder. In situ PPy polymerization around Si nanoparticles forms a 3D interconnected conductive network within the PPy/Si anodes, effectively accommodating volume changes and maintaining electrical contact during the galvanostatic cycling. The particle size dependence shows that larger Si nanoparticles provide higher initial charge capacity (2975 mAh/g), whereas smaller ones improve cycling stability (85 % capacity retention after 100 cycles). Amorphous Si exhibits significantly lower specific capacity but superior capacity retention (∼100 % after 100 cycles) compared to crystalline Si. Cyclic voltammetry and electrochemical impedance spectroscopy demonstrate that integrating 6 or 20 nm Si nanocrystals into a 3D crosslinked PPy enhances anode performance. These findings highlight the importance of optimizing Si properties in designing conductive hydrogel-derived anodes for high-performance LIBs. © 2025 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license ( http://creativecommons.org/licenses/by/4.0/).

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20506 - Coating and films

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

JOURNAL OF POWER SOURCES

ISSN

0378-7753

e-ISSN

1873-2755

Svazek periodika

661

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

14

Strana od-do

238620

Kód UT WoS článku

001607315600001

EID výsledku v databázi Scopus

2-s2.0-105020695896