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Carbon Nanofibers Interlayer: A Highly Effective Strategy to Stabilize Silicon Anodes for Lithium-ion Batteries

Abstract

Silicon (Si) shows the highest theoretical capacity anode material for lithium-ion batteries, and many efforts have been made on addressing the poor cycling stability issue associated with its huge volume changes during Li-Si alloy/de-alloy processes, mostly through nanostructured material design. Herein, we reported a simple cell configuration approach to improve the lithium storage performance of commercial nano-Si by insertion carbon nanofiber films (CNFs) as an interlayer between the Si electrodes and separators. By this advanced cell configuration, the commercial Si nanoparticle (Si NPs) electrodes show significantly improved reversible capacity (2700 mAhg-1 after 40 cycles at 50 mAg-1) and ultralong cycle life (1250 mAhg-1 after 430 cycles at 1500 mAg-1). Even cycled at 4 Ag-1, it still displays a very high capacity of 870 mAhg-1. The excellent electrochemical performance of Si NPs is attributed to the novel cell configuration: macropores between carbon nanofibers provide good access of the electrolyte to the Si NPs electrodes; 3D interconnected networks of CNFs interlayer not only decrease internal charge transfer resistance and enhance electron transport rate but also offer electron pathways along with CNFs interlayer for cracked and disconnected Si NPs after cycles.

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Publication details

The article was received on 04 May 2018, accepted on 06 Jun 2018 and first published on 06 Jun 2018


Article type: Paper
DOI: 10.1039/C8NR03623C
Citation: Nanoscale, 2018, Accepted Manuscript
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    Carbon Nanofibers Interlayer: A Highly Effective Strategy to Stabilize Silicon Anodes for Lithium-ion Batteries

    Y. Yu, W. Li, M. Li, X. Zhong, L. Gu and A. J. shi, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR03623C

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