Journal
ELECTROCHIMICA ACTA
Volume 383, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2021.138339
Keywords
Tungsten disulfide (WS2); Anode; Cut-offpotential; Sodium-ion battery; Potassium-ion battery
Categories
Funding
- SERB, DST, Govt. of India under the Overseas Visiting Doctoral Fellowship (OVDF) scheme [SB/S9/Z-03/2017-VIII]
- National Science Foundation [CBET1804300]
- Office of Naval Research [N0 0 0141812397]
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The impact of the operating potential window of WS2 electrodes during charge-discharge in Na and K-ion batteries was investigated, revealing that restricting the upper cut-off potential to 2.0 V resulted in better electrochemical performance. Additionally, kinetic analysis showed that K-ion storage in WS2 electrodes is diffusion dominated, while Na-ion storage is pseudo-capacitive in nature.
Transition metal dichalcogenides (TMDs)-based layered anode materials are gaining attention because of their large interlayer spacing to host Na- and K-ions. However, the capacity retention and coulombic efficiency are major obstacles for such rechargeable K-ion battery anodes. Beside, understanding operating potential window employed during charge-discharge processes plays important role on the electrochemical performance. In this work, the impact of operating potential window of WS2 electrodes during charge-discharge is investigated in Na and K-ion battery. WS2 nano-plates are synthesized using one step solid-state reaction under autogenic pressure at elevated temperature (RAPET) method. The upper cut-off potential is restricted to 2.0, 2.5, and 3.0 V to understand the stability of the electrode. The restriction of upper cut-off potential at 2.0 V, results into the capacity retention of 73% (180 mAh g(-1)) and 75% (250 mAh g(-1)) in Potassium-ion and Sodium-ion batteries at the end of 50 cycles. Further, kinetic analysis reveals that the K-ion storage in WS2 electrode is diffusion dominated due to intercalation of K-ion into host lattice, and Na-ion storage is pseudo-capacitive in nature. Published by Elsevier Ltd.
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