Carbon nanofibers with hybrid crystalline-amorphous silicon nanoparticles: high-rate capable lithium-ion battery

Chandravanshi, D and Gope, S and Hemaprabha, E and Chattopadhyay, K (2023) Carbon nanofibers with hybrid crystalline-amorphous silicon nanoparticles: high-rate capable lithium-ion battery. In: Journal of Materials Science: Materials in Electronics, 34 (5).

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Abstract

With the rapid commercialization of electric vehicles, fast-charging high-energy batteries are the need of the hour. Developing such high-rate capable batteries need advanced materials beneficial for providing high energy densities and long-lasting cycle life. Silicon, one of the high energy anode materials with a theoretical capacity of 4200 mAh g− 1, is prone to volume expansion and degrades the battery performance. Herein, we utilize the hybrid silicon structure (crystalline and amorphous) prepared by a large-scale cryomilling process and embed them in carbon nanofibers to combat these challenges. We have further investigated the effect of the changes in carbon-fiber characteristics (e.g., diameter and morphology) on silicon structure. From the perspective of high-rate capable battery applications, electrochemical performance has been studied for mid-to-high current density. The ensemble constituting silicon/carbon nanofiber exhibits excellent charge-discharge rate capability over current densities (4-160 A g− 1electrode). A specific capacity of 3050 mAh g− 1 was calculated for the first cycle, corresponding to 73% of the theoretical value, with charge-discharge stability for over 100 cycles.

Item Type:	Journal Article
Publication:	Journal of Materials Science: Materials in Electronics
Publisher:	Springer
Additional Information:	The copyright for this article belongs to Springer.
Keywords:	Amorphous silicon; Anodes; Carbon fibers; Charging (batteries); Lithium-ion batteries, Advanced materials; Amorphous silicon nanoparticles; Carbon nanofibres; Commercialisation; Energy; Fast charging; High rate; Higher energy density; Long lasting; Silicon structures, Carbon nanofibers
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit Division of Interdisciplinary Sciences > Interdisciplinary Centre for Energy Research Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	21 Feb 2023 03:34
Last Modified:	21 Feb 2023 03:34
URI:	https://eprints.iisc.ac.in/id/eprint/80550

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