TY - JOUR
T1 - Silicon nanoparticle-sandwiched ultrathin MoS 2 -graphene layers as an anode material for Li-ion batteries
AU - Kawade, Ujjwala V.
AU - Ambalkar, Anuradha A.
AU - Panmand, Rajendra P.
AU - Kalubarme, Ramchandra S.
AU - Kadam, Sunil R.
AU - Naik, Sonali D.
AU - Kulkarni, Milind V.
AU - Kale, Bharat B.
N1 - Publisher Copyright:
© 2019 the Partner Organisations.
PY - 2019/4/1
Y1 - 2019/4/1
N2 - Herein, we report the facile scalable synthesis of silicon (Si)/molybdenum disulfide-graphene (MoS 2 -G) nanocomposites with various Si/MoS 2 ratios as anode materials for lithium-ion batteries (LIB). XRD studies indicated the existence of silicon, MoS 2 and graphene phases. The graphene phase has been merged with the MoS 2 layers. The morphological study clearly shows the presence of layered MoS 2 and graphene. The FETEM microstructural study surprisingly showed flaky silicon particles sandwiched between graphene and MoS 2 layers. Furthermore, the existence of graphene, MoS 2 and silicon was confirmed by Raman spectroscopy and XPS. The surface area and porosity of the powders were characterized using Brunauer-Emmett-Teller analysis. Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic charge-discharge measurements were performed for electrochemical investigations. The Si/MoS 2 nanocomposite delivered a reversible discharge capacity of 1549 mA h g -1 in the voltage window of 0.01-3.0 V, which was higher as compared to that of MoS 2 -G, and displayed better stability than pristine silicon. The MoS 2 -G and Si@MoS 2 -G nanocomposites with Si/MoS 2 in a 1:2 ratio delivered the highest and most stable reversible capacities of 677 and 923 mA h g -1 at 200 mA g -1 , respectively, over 90 cycles. The results demonstrate that the flexible graphene-like layered MoS 2 -G structures act as perfect substrates for Si nanoparticles. These Si nanoparticles, being sandwiched in layers, allow adequate space between MoS 2 -G for easy lithium-ion transport and also limit the volume expansion during lithiation and delithiation. More significantly, by integrating the advantages of nanostructure engineering and hybridization, better lithium diffusion kinetics have been observed because of the shortened diffusion path length, which ultimately improves the reversible capacity and cycling performance. This unique combination, which has not been hitherto attempted, is responsible for the stable reversible capacity.
AB - Herein, we report the facile scalable synthesis of silicon (Si)/molybdenum disulfide-graphene (MoS 2 -G) nanocomposites with various Si/MoS 2 ratios as anode materials for lithium-ion batteries (LIB). XRD studies indicated the existence of silicon, MoS 2 and graphene phases. The graphene phase has been merged with the MoS 2 layers. The morphological study clearly shows the presence of layered MoS 2 and graphene. The FETEM microstructural study surprisingly showed flaky silicon particles sandwiched between graphene and MoS 2 layers. Furthermore, the existence of graphene, MoS 2 and silicon was confirmed by Raman spectroscopy and XPS. The surface area and porosity of the powders were characterized using Brunauer-Emmett-Teller analysis. Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic charge-discharge measurements were performed for electrochemical investigations. The Si/MoS 2 nanocomposite delivered a reversible discharge capacity of 1549 mA h g -1 in the voltage window of 0.01-3.0 V, which was higher as compared to that of MoS 2 -G, and displayed better stability than pristine silicon. The MoS 2 -G and Si@MoS 2 -G nanocomposites with Si/MoS 2 in a 1:2 ratio delivered the highest and most stable reversible capacities of 677 and 923 mA h g -1 at 200 mA g -1 , respectively, over 90 cycles. The results demonstrate that the flexible graphene-like layered MoS 2 -G structures act as perfect substrates for Si nanoparticles. These Si nanoparticles, being sandwiched in layers, allow adequate space between MoS 2 -G for easy lithium-ion transport and also limit the volume expansion during lithiation and delithiation. More significantly, by integrating the advantages of nanostructure engineering and hybridization, better lithium diffusion kinetics have been observed because of the shortened diffusion path length, which ultimately improves the reversible capacity and cycling performance. This unique combination, which has not been hitherto attempted, is responsible for the stable reversible capacity.
UR - http://www.scopus.com/inward/record.url?scp=85063578124&partnerID=8YFLogxK
U2 - 10.1039/c8qm00568k
DO - 10.1039/c8qm00568k
M3 - Article
AN - SCOPUS:85063578124
SN - 2052-1537
VL - 3
SP - 587
EP - 596
JO - Materials Chemistry Frontiers
JF - Materials Chemistry Frontiers
IS - 4
ER -
