期刊
JOURNAL OF POWER SOURCES
卷 507, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2021.230306
关键词
alpha-MoO3-x nanobelts; Lithium dendrites; Oxygen-deficient MoO3; Lithium anode; Lithium-sulfur battery
资金
- Ministry of Science and Technology (MOST) of Taiwan, R.O.C. [MOST107-2221-E-001-007-MY3, MOST109-2124-M-001-004, MOST106-2113-M-009-012-MY3, MOST107-2221-E-009-043-MY2, MOST108-3017-F-009-004]
- Center for Emergent Functional Matter Science of National Chiao Tung University from the Featured Areas Research Center Program by the Ministry of Education (MOE) in Taiwan, R.O.C.
In this study, MoO3 nanobelts were used to passivate Li metal anodes, effectively suppressing the formation of Li dendrites and improving stability. The MoO3-coated Li anode exhibited minimal surface degradation and low overpotential in symmetrical cells, showing promising potential for long cycle life and high coulombic efficiency in Li-metal batteries.
In this study, MoO3 nanobelts (MNBs) are passivated on lithium (Li) metal anodes to suppress Li dendrite formation and, thereby improve the stability in Li-metal batteries. MoO3 powder is ground into MNBs using a commercially viable mechanical grinding technique. The MNBs are then coated on Li metal using a simple spray-coating technique. The MNBs on top of the pristine Li mitigates the formation of Li dendrites by generating a uniform Li+ ion flux and providing shorter diffusion pathways. This facile passivation strategy prevents the growth of undesirable dendrites on pristine Li surfaces. A live transparent Li-Li symmetrical cell having MoO3-coated Li anode (MNB-Li) does not form any Li dendrites and undergoes minimal surface degradation relative to that of the corresponding pristine Li cell. The Li-Li symmetrical cells featuring the MoO3-coated surface operate with a low overpotential of approximately 18 mV for an extremely long period of time (ca. 2500 h) at a current density of 1 mA cm(-2). A Li-sulfur battery featuring the MNB-Li at 0.5 C significantly improves stability, with an initial capacity of 1127 mAh g(-1), a capacity of 820 mAh g(-1) for up to 200 cycles, and an excellent coulombic efficiency of 98.12 %.
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