Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 19, Pages 6239-6243Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201900076
Keywords
anodes; Co9S8-carbon; Co9S8; grain boundaries; pseudocapacitance; sodium-ion batteries
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Funding
- Research Grants Council of the Hong Kong Special Administrative Region, China [PolyU152208/18E, 152064/15E]
- Innovation and Technology Fund of Hong Kong, China [GHX/001/16GD]
- Hong Kong Polytechnic University [5-ZJL8]
- National Natural Science Foundation of China [11704291]
- Departmental Allocation of Discretionary Fund, Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong
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The sodium-ion battery is a promising battery technology owing to its low price and high abundance of sodium. However, the sluggish kinetics of sodium ion makes it hard to achieve high-rate performance, therefore impairing the power density. In this work, a fiber-in-tube Co9S8-carbon(C)/Co9S8 is designed with fast sodiation kinetics. The experimental and simulation analysis show that the dominating capacitance mechanism for the high Na-ion storage performance is due to abundant grain boundaries, three exposed layer interfaces, and carbon wiring in the design. As a result, the fiber-in-tube hybrid anode shows a high specific capacity of 616mAhg(-1) after 150 cycles at 0.5Ag(-1). At 1Ag(-1), a capacity of ca. 451mAhg(-1) can be achieved after 500 cycles. More importantly, a high energy density of 779Whkg(-1) and power density of 7793Wkg(-1) can be obtained simultaneously.
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