Journal
JOURNAL OF SCIENCE-ADVANCED MATERIALS AND DEVICES
Volume 4, Issue 2, Pages 223-229Publisher
VIETNAM NATL UNIV
DOI: 10.1016/j.jsamd.2019.04.009
Keywords
Rice husk; Cathode material; Carbonization process; Activated carbon; Lithium-sulfur batteries
Funding
- Ministry of Science and Technology, Vietnam [NDT.19.TW/16]
- Ministry of Science and Technology, Taiwan [15/FIRST/1.a/HUST, MOST 105-E002-012-MY12]
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In this work, we developed highly porous activated carbon (AC) materials with micro/meso porosity through carbonizing rice husk and treating them with K2CO3. Elemental sulfur was then loaded to the micropores through a solution infiltration method to form rice husk-derived activated carbon (RHAC)@S composite materials. The as-prepared RHAC@S composites with 0.25 mg cm(-1) and 0.38 mg cm(-1) of sulfur loading were tested as cathodes for lithium-sulfur (Li-S) batteries. The 0.25 mg cm(-1) sulfur loaded sample showed an initial discharge capacity of 1080 mA h/g at a 0.1 C rate. After 50 cycles of charge/discharge tests at the current density of 0.2 C, the reversible capacity is maintained at 312 mA h/g. The RHAC material delivered a capacity of more than 300 mA h/g at a current density of 1.7 C. These results demonstrate that the RHAC porous materials are very promising as cathode materials for the development of high-performance Li-S batteries. (C) 2019 The Authors. Publishing services by Elsevier B. V. on behalf of Vietnam National University, Hanoi.
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