Electrospun 3D structured carbon current collector for Li/S batteries
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Date
2020-08
Authors
Yerkinbekova, Yerkezhan
Kalybekkyzy, Sandugash
Mentbayeva, Almagul
Baikalov, Nurzhan
Kahraman, Memet Vezir
Bakenov, Zhumabay
Journal Title
Journal ISSN
Volume Title
Publisher
The 8th International Conference on Nanomaterials and Advanced Energy Storage Systems; Nazarbayev University; National Laboratory Astana; Institute of Batteries
Abstract
Light weight carbon nanofibers (CNF) fabricated by a simple electrospinning method and used as a 3D structured current collector for a sulfur cathode. Along with a light weight, this 3D current collector allowed us to accommodate a higher amount of sulfur composite, which led to a remarkable increase of the electrode capacity from 200 to 500 mAh g-1 of the electrode including the mass of the current collector. Varying the electrospinning solution concentration enabled obtaining carbonized nanofibers of uniform structure and controllable diameter from several hundred nanometers to several micrometers. The electrochemical performance of the cathode deposited on carbonized PAN nanofibers at 800 ◦C was investigated. An initial specific capacity of 1620 mAh g−1 was achieved with a carbonized PAN nanofiber (cPAN) current collector. It exhibited stable cycling over 100 cycles maintaining a reversible capacity of 1104 mAh g−1 at the 100th cycle, while the same composite on the Al foil delivered only 872 mAh g−1. At the same time, 3D structured CNFs with a highly developed surface have a very low areal density of 0.85 mg cm−2 (thickness of ~25 μm), which is lower for almost ten times than the commercial Al current collector with the same thickness (7.33 mg cm−2 ).
Description
Keywords
carbon nanofibers, CNF, Research Subject Categories::TECHNOLOGY, carbonized PAN nanofiber, cPAN
Citation
Yerkinbekova, Y., Kalybekkyzy, S., Mentbayeva, A., Baikalov, N., Kahraman, M.V. & Bakenov, Z. (2020). Electrospun 3D structured carbon current collector for Li/S batteries [Abstract]. The 8th International Conference on Nanomaterials and Advanced Energy Storage Systems; Nazarbayev University; National Laboratory Astana; Institute of Batteries.