TY - JOUR

T1 - Effect of in-plane size of MoS2 nanoparticles grown over multilayer graphene on the electrochemical performance of anodes in Li-ion batteries

AU - Bulusheva, L. G.

AU - Koroteev, V. O.

AU - Stolyarova, S. G.

AU - Chuvilin, A. L.

AU - Plyusnin, P. E.

AU - Shubin, Yu V.

AU - Vilkov, O. Y.

AU - Chen, Xiaohong

AU - Song, Huaihe

AU - Okotrub, A. V.

N1 - Funding Information: We thank Dr. B.A. Kolesov for Raman spectra and the bilateral Program “Russian-German Laboratory at BESSY II” for technical assistance of the XPS and NEXAFS measurements. The work was financially supported by the Russian Science Foundation (Grant 16-13-00016 ). Publisher Copyright: © 2018 Elsevier Ltd

PY - 2018/9/1

Y1 - 2018/9/1

N2 - Electrochemical performance of MoS2/graphene materials in Li-ion batteries is strongly dependent on the structure of individual components and their coupling in the hybrid. We present a comparative study of the materials produced by annealing of amorphous MoS3 deposited on the surface of multilayer graphene flakes at 500 °C, 800 °C, and 1000 °C in vacuum. X-ray photoelectron spectroscopy confirmed a transformation of MoS3 to MoS2 at these conditions. High-resolution transmission electron microscopy and Raman scattering showed a growth of in-plane size of MoS2 nanocrystals with a raise of annealing temperature. Electrochemical tests detected a gradual decrease of the specific capacity of the MoS2/graphene materials prepared at 500 and 800 °C and a stable performance for the material synthesized at 1000 °C even at high current densities. Based on the initial discharge-charge profiles, we associate this effect with in-plane size of MoS2 nanocrystals, which should decompose more easily when the size is small, due to the interaction of lithium with edge sulfur atoms.

AB - Electrochemical performance of MoS2/graphene materials in Li-ion batteries is strongly dependent on the structure of individual components and their coupling in the hybrid. We present a comparative study of the materials produced by annealing of amorphous MoS3 deposited on the surface of multilayer graphene flakes at 500 °C, 800 °C, and 1000 °C in vacuum. X-ray photoelectron spectroscopy confirmed a transformation of MoS3 to MoS2 at these conditions. High-resolution transmission electron microscopy and Raman scattering showed a growth of in-plane size of MoS2 nanocrystals with a raise of annealing temperature. Electrochemical tests detected a gradual decrease of the specific capacity of the MoS2/graphene materials prepared at 500 and 800 °C and a stable performance for the material synthesized at 1000 °C even at high current densities. Based on the initial discharge-charge profiles, we associate this effect with in-plane size of MoS2 nanocrystals, which should decompose more easily when the size is small, due to the interaction of lithium with edge sulfur atoms.

KW - Bridge disulfides

KW - DFT calculations

KW - Li-ion batteries

KW - MoS/Graphene hybrids

KW - NEXAFS C K-Edge

KW - STORAGE

KW - MOLYBDENUM-DISULFIDE MOS2

KW - AMMONIUM TETRATHIOMOLYBDATE

KW - MECHANISM

KW - MoS2/Graphene hybrids

KW - DOPED-CARBON

KW - NANOSHEETS

KW - NANOCOMPOSITES

KW - EVOLUTION

KW - CYCLING STABILITY

KW - LITHIUM-SULFUR BATTERIES

UR - http://www.scopus.com/inward/record.url?scp=85049088368&partnerID=8YFLogxK

U2 - 10.1016/j.electacta.2018.06.134

DO - 10.1016/j.electacta.2018.06.134

M3 - Article

AN - SCOPUS:85049088368

VL - 283

SP - 45

EP - 53

JO - Electrochimica Acta

JF - Electrochimica Acta

SN - 0013-4686

ER -