Anode performance of hydrothermally grown carbon nanostructures and their molybdenum chalcogenides for Li-ion batteries
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Research Letter
Anode performance of hydrothermally grown carbon nanostructures and their molybdenum chalcogenides for Li-ion batteries Hamza Simsir, Department of Metallurgical and Materials Engineering, Karabuk University, 78050 Karabuk, Turkey; Institute of Inorganic Chemistry, University of Cologne Greinstrasse 6, D-50939 Cologne, Germany Nurettin Eltugral, Department of Metallurgical and Materials Engineering, Karabuk University, 78050 Karabuk, Turkey Robert Frohnhoven, Tim Ludwig, and Yakup Gönüllü, Institute of Inorganic Chemistry, University of Cologne Greinstrasse 6, D-50939 Cologne, Germany Selhan Karagoz, Department of Chemistry, Karabuk University, 78050 Karabuk, Turkey Sanjay Mathur, Institute of Inorganic Chemistry, University of Cologne Greinstrasse 6, D-50939 Cologne, Germany Address all correspondence to Nurettin Eltugral at [email protected] (Received 2 March 2018; accepted 29 March 2018)
Abstract Three different hydrothermally grown carbonaceous materials and their molybdenum chalcogenides derived from glucose (HTC, HTC–MoO2, HTC–MoS2) were investigated to evaluate their potential as Li-ion battery anodes. All tested materials exhibited good cycling performance at a current density of 100 mA/g and showed high coulombic efficiency, >98%, after the 50th cycle. Reversible charge capacities of HTC, HTC–MoO2, and HTC–MoS2 were 296, 266, and 484 mAh/g, respectively, after 50 successive cycles. This study demonstrated that the HTC–MoS2 showed the highest reversible charge capacity which promises to be a good candidate for an environmentally friendly anode material for Li-ion batteries.
Introduction Li-ion batteries have high-energy and -power density in comparison with standard batteries since they can be charged and discharged many times.[1,2] However, when the number of charge–discharge cycles increases, battery capacity performance decreases over time. It is known that this reduction in performance is caused by the deterioration of the electrode structure due to the ion transfer between the electrodes and the reduction of the electrolyte solution leading to the formation of the decomposition product that deposits on the electrode surface. This layer is called solid electrolyte interphase (SEI).[3,4] The cornerstone of making high-performance Li-ion batteries is to produce electrode materials with enhanced charge–discharge capacity that is retained after a high number of cycles. Thus, there has been a growing interest to improve the performance of Li-ion batteries.[5–8] In recent years, nanocomposites of carbonaceous materials coated by either MoO2 or MoS2 have been the scope of the intensive investigations since they have enhanced cycling performance as Li-ion battery anodes due to their high conductivity, large contact area, and good chemical stability.[9] Although MoO2 and MoS2 have higher electrochemical activity and high capacity (838 mAh/g for MoO2 and 670 mAh/g for MoS2) than that of graphite electrode (372 mAh/g), their poor cycling stability still remains a problem when they ar
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