Duc Anh Dinh
Istituto Italiano di Tecnologia
Duc Anh Dinh received his B.S from the Department of Material Science at University of Science,Vietnam,in 2011. After that,he moved to Pusan National University, South Korea to pursue his graduate program in Material science&engineering. He completed his M.S in the field of graphene and optoelectronic materials in 2014. Up to date,Anh is working as Ph.D fellow under supervision of Dr. Francesco Bonaccorso in production of graphene and 2D crystal-based functional electrodes for Li-ion batteries at Istituto Italiano di Tecnologia, Italy. His interests included the synthesis, properties and applications of TCO materials;fabrication of graphene and graphene related materials for energy applications.
Today, lithium-ion batteries (LIBs)1 are dominating the ever-increasing market for portable electronic devices. Commercial LIBs are based on graphite anode and LiCoO2 cathode, exhibiting specific capacity of 372 mAh g-1 and... [ view full abstract ]
Today, lithium-ion batteries (LIBs)1 are dominating the ever-increasing market for portable electronic devices. Commercial LIBs are based on graphite anode and LiCoO2 cathode, exhibiting specific capacity of 372 mAh g-1 and energy densities of 120−150 Wh kg-1,1 thus being unable to meet the requirement of high energy applications. In order to increase the energy/power density of current LIBs, tremendous efforts have been made in the quest of alternative anode materials. Amongst them, molybdenum disulfide (MoS2), having a theoretical specific capacity of 670 mAh g-1 and a large spacing layer (0.62 nm)2 compared to graphite (0.34 nm),3 has attracted great attention as a promising LIB anode material. However, MoS2 as stand-alone anode is limited by its low electrical conductivity and pulverization upon lithiation/delithiation.3 Here, we propose the use of MoS2 flakes/carbon (MoS2/C) composites as active materials for LIB anode. The MoS2 flakes are obtained by liquid phase exfoliation of bulk MoS2 in 2-propanol, with average lateral size of ~90 nm and inter-layer spacing (0.64 nm), see Fig. 1a,b, favorable for Li+ diffusion. The thermal decomposition of polyacrylic acid is exploited for the MoS2/C composites realization. The MoS2/C with three different C ratios (10%, 16% and 30%) are deposited onto copper substrate as anode and tested in half-cell configuration. The MoS2/C composite anode with carbon content of 16% exhibits the reversible specific capacity of 521 mAh g-1 at 100 mA g-1 after 100 cycles, with a coulombic efficiency of 99.7%, see Fig. 2. Moreover, this electrode exhibits a low value of charge transfer resistance (26 Ω) with respect to the one of pristine MoS2 electrode (170 Ω) after 100 cycles, see Fig. 3. Thus, the carbon network has a double function: (i) buffers volume expansion, (ii) enhances the electrical conductivity of the active material during lithiation/de-lithiation. Our study demonstrates the optimization of the electrochemical properties of MoS2/C electrode for LIB by exploiting a facile process, which is promising for an environmentally friendly, low-cost and large-scale production process.
1. Hassoun,J.; et al. Nano Lett. 2014, 14,4901
2. Du,G.; et al. Chem Commun. 2010, 46,1106
3. Stephenson,T; et al. Energ Environ Sci 2014, 7,209
