Please use this identifier to cite or link to this item: doi:10.22028/D291-30602
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Title: Choosing the right carbon additive is of vital importance for high-performance Sb-based Na-ion batteries
Author(s): Pfeifer, Kristina
Arnold, Stefanie
Budak, Öznil
Luo, Xianlin
Presser, Volker
Ehrenberg, Helmut
Dsoke, Sonia
Language: English
Title: Journal of materials chemistry A
Volume: 8
Issue: 12
Startpage: 6092
Endpage: 6104
Publisher/Platform: RSC
Year of Publication: 2020
Publikation type: Journal Article
Abstract: Electrodes based on alloying reactions for sodium-ion batteries (NIB) offer high specific capacity but require bespoken electrode material design to enable high performance stability. This work addresses that issue by systematically exploring the impact of carbon properties on antimony/carbon composite electrodes for NIBs. Since the Sb surface is covered by an insulating oxide layer, carbon additives are crucial for the percolation and electrochemical activity of Sb based anodes. Instead of using complex hybridization strategies, the ability of mechanical mixing to yield stable high-performance Sb/C sodium-ion battery (NIB) electrodes is shown. This is only possible by considering the physical, chemical, and structural features of the carbon phase. A comparison of carbon nanohorns, onion-like carbon, carbon black, and graphite as conductive additives is given in this work. The best performance is not triggered by the highest or lowest surface area, and not by highest or lowest heteroatom content, but by the best ability to homogenously distribute within the Sb matrix. The latter provides an optimum interaction between carbon and Sb and is best enabled by onion-like carbon. A remarkable rate performance is attained, electrode cracking caused by volume expansion is successfully prevented, and the homogeneity of the solid/electrolyte interphase is significantly improved as a result of it. With this composite electrode, a reversible capacity of 490 mA h g−1 at 0.1 A g−1 and even 300 mA g−1 at 8 A g−1 is obtained. Additionally, high stability with a capacity retention of 73% over 100 cycles is achieved at charge/discharge rates of 0.2 A g−1.
DOI of the first publication: 10.1039/D0TA00254B
URL of the first publication:
Link to this record: hdl:20.500.11880/28932
ISSN: 2050-7488
Date of registration: 1-Apr-2020
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Materialwissenschaft und Werkstofftechnik
Professorship: NT - Prof. Dr. Volker Presser
Collections:UniBib – Die Universitätsbibliographie

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