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Open AccessArticle

Enhancing the Electrochemical Performance of SbTe Bimetallic Anodes for High-Performance Sodium-Ion Batteries: Roles of the Binder and Carbon Support Matrix

1
Department of Organic Material Science and Engineering, Pusan National University, 2, Busandaehak-ro 63beon gil, Geumjeong-gu, Busan 46241, Korea
2
Department of Chemical and Biological Engineering, Gachon University, Seongnam-si, Gyeonggido 13120, Korea
3
Photo-electronic Hybrids Research Center, Korea Institute of Science and Technology, 5 Hwarang-ro 14-gil, Seongbuk Gu, Seoul 02729, Korea
*
Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(8), 1134; https://doi.org/10.3390/nano9081134
Received: 20 July 2019 / Revised: 2 August 2019 / Accepted: 6 August 2019 / Published: 7 August 2019
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Abstract

Synergism between the alloy materials and the carbon support matrix, in conjunction with the binder and electrolyte additives, is of utmost importance when developing sodium-ion batteries as viable replacements for lithium-ion batteries. In this study, we demonstrate the importance of the binder and carbon support matrix in enhancing the stabilities, cyclabilities, and capacity retentions of bimetallic anodes in sodium-ion batteries. SbTe electrodes containing 20%, 30%, and 40% carbon were fabricated with polyvinylidene fluoride (PVDF) and polyacrylic acid (PAA) binders, and electrochemically evaluated at a current rate of 100 mA g−1 using electrolytes with 0%, 2%, and 5% added fluoroethylene carbonate (FEC). The electrodes with the PVDF binder in cells with 5% FEC added to the electrolyte showed capacity retentions that increased with increasing carbon percentage, delivering reversible capacities of 34, 69, and 168 mAh g−1 with 20%, 30%, and 40% carbon; these electrodes retained 8.1%, 17.4%, and 44.8% of their respective capacities after 100 cycles. However, electrodes composed of the PAA binder in cells with 5% FEC added to the electrolyte delivered reversible capacities of 408, 373, and 341 mAh g−1 with 20%, 30%, and 40% carbon; 93.5%, 93.4%, and 94.4% of their respective capacities were retained after 100 cycles. The carbon support matrix plays a significant role in improving the stability, cyclability, and capacity retention of the electrode. However, when the tradeoff between capacity and cyclability associated with carbon percentage is considered, the binder plays a significantly more prominent role in achieving high capacities, high cyclabilities, and enhanced retention rates. View Full-Text
Keywords: sodium-ion battery; PAA binder; bimetallic anode; antimony; tellurium sodium-ion battery; PAA binder; bimetallic anode; antimony; tellurium
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Nagulapati, V.M.; Kim, D.S.; Oh, J.; Lee, J.H.; Hur, J.; Kim, I.T.; Lee, S.G. Enhancing the Electrochemical Performance of SbTe Bimetallic Anodes for High-Performance Sodium-Ion Batteries: Roles of the Binder and Carbon Support Matrix. Nanomaterials 2019, 9, 1134.

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