Reversible Mg insertion into chevrel phase Mo6S8 cathode: Preparation, electrochemistry and X-ray photoelectron spectroscopy study

Journal Article · Tue May 15 04:00:00 EDT 2018 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2018.01.031· OSTI ID:22803971

Muthuraj, Divyamahalakshmi; Mitra, Sagar ^[1]

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1. Department of Energy Science and Engineering, IIT Bombay, Powai, Mumbai 400076 (India)

Highlights: • Surface modification of Mo6S8 to enhance the reactivity against Mg. • Mechanism study using XPS and EIS. • Excellent Mg-ion battery performance. - Abstract: Electrical energy storage is absolute for complete usage of all renewable energy sources. Herein, we have studied the electrochemical performance of Chevrel phase Mo{sub 6}S{sub 8} as cathode material towards rechargeable Mg battery. Solution chemistry route is adopted for the synthesis of Mo{sub 6}S{sub 8.} The morphology, phase purity is analyzed by Scanning Electron Microscopy, Transmission Electron Microscopy, and X-Ray Diffraction techniques. The cyclic Voltammetry and Galvanostatic charge-discharge studies confirmed the reversibility of Mg-ion insertion. Herein, Mo{sub 6}S{sub 8} cubes show excellent capacity retention of 70 mAh g{sup −1} for 200 cycles at C/5 rate. The role of CNT in improving rate performance was also demonstrated. The reasonable reversible capacity, rate performance, and cycling stability reveal the feasibility of Mo{sub 6}S{sub 8} material for future rechargeable Mg battery. In order to study the kinetics of Chevrel phase compound upon cycling, EIS study was carried out. The redox process upon insertion/extraction is investigated by X-ray Photoelectron spectroscopy which shows no change in oxidation state of a transition metal.

• OSTI ID: 22803971
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Vol. 101; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
36 MATERIALS SCIENCE
BATTERY CHARGING
CAPACITY
CATHODES
ELECTRIC BATTERIES
ELECTROCHEMISTRY
ENERGY STORAGE
MAGNESIUM IONS
MOLYBDENUM SULFIDES
MORPHOLOGY
PERFORMANCE
REACTIVITY
REDOX PROCESS
SCANNING ELECTRON MICROSCOPY
SYNTHESIS
TRANSMISSION ELECTRON MICROSCOPY
VOLTAMETRY
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY