Roll-Pressed Silicon Anodes with High Reversible Volumetric Capacity Achieved by Interfacial Stabilization and Mechanical Strengthening of a Silicon/Graphene Hybrid Assembly

Application of Si anodes is hindered by severe capacity fading due to pulverization of Si particles during the large volume changes of Si during charge/discharge and repeated formation of the solid-electrolyte interphase. To address these issues, considerable efforts have been devoted to the develop...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2023-09, Vol.19 (38), p.e2301744-e2301744
Main Authors: Kim, Young Hwan, Choi, Song-Gue, Chung, Kyung Yoon, Lee, Geon-Woo, Choi, Yong Gil, Kim, Kwang-Bum
Format: Article
Language:English
Subjects:
Aminopropyltriethoxysilane
Anodes
Assembly
Bonding strength
Chemical bonds
Composite materials
Electrodes
Graphene
Interface stability
Nanoparticles
Nanotechnology
Silicon
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Summary:Application of Si anodes is hindered by severe capacity fading due to pulverization of Si particles during the large volume changes of Si during charge/discharge and repeated formation of the solid-electrolyte interphase. To address these issues, considerable efforts have been devoted to the development of Si composites with conductive carbons (Si/C composites). However, Si/C composites with high C content inevitably show low volumetric capacity because of low electrode density. For practical applications, the volumetric capacity of a Si/C composite electrode is more important than gravimetric capacity, but volumetric capacity in pressed electrodes is rarely reported. Herein, a novel synthesis strategy is demonstrate for a compact Si nanoparticle/graphene microspherical assembly with interfacial stability and mechanical strength achieved by consecutively formed chemical bonds using 3-aminopropyltriethoxysilane and sucrose. The unpressed electrode (density: 0.71 g cm ) shows a reversible specific capacity of 1470 mAh g with a high initial coulombic efficiency of 83.7% at a current density of 1 C-rate. The corresponding pressed electrode (density: 1.32 g cm ) exhibits high reversible volumetric capacity of 1405 mAh cm and gravimetric capacity of 1520 mAh g with a high initial coulombic efficiency of 80.4% and excellent cycling stability of 83% over 100 cycles at 1 C-rate.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.202301744