TY - JOUR

T1 - Pressure-Assisted Interface Engineering in MoS2/Holey Graphene Hybrids for Improved Performance in Li-ion Batteries

AU - Stolyarova, Svetlana G.

AU - Koroteev, Victor O.

AU - Shubin, Yury V.

AU - Plyusnin, Pavel E.

AU - Makarova, Anna A.

AU - Okotrub, Alexander V.

AU - Bulusheva, Lyubov G.

PY - 2019/10/1

Y1 - 2019/10/1

N2 - The interface between MoS2 and carbon components plays an important role in the performance of the hybrid material in Li-ion batteries. To enhance the interfacial interactions, holey graphene (HG) layers are used as a support for the forming MoS2, and the compression of components is used during the synthesis. Initial compositions, obtained by deposition of MoS3 on the surface of HG stacks, are annealed at 400–600 °C and 100 bar. Using a set of characterization methods, the synthesis products are studied and it is found that the hole boundaries anchor MoS2 via covalent C–Mo coupling, while the applied pressure assists in the development of a thin MoS2 coating. The number of layers and their lateral dimensions are dependent on the synthesis temperature. The tests of Li-ion half-cells detected higher values of specific capacity for MoS2/HG hybrids synthesized under compression. Enhanced interaction between the components prevents the destruction of MoS2 during discharging–charging of electrodes, and the capacity increases due to the accommodation of lithium between the layers of MoS2 and HG. The structural features of MoS2/HG hybrids stipulate growth of specific capacity with long-term cycling to ≈1200 mA h g−1 at a current density of 0.5 A g−1.

AB - The interface between MoS2 and carbon components plays an important role in the performance of the hybrid material in Li-ion batteries. To enhance the interfacial interactions, holey graphene (HG) layers are used as a support for the forming MoS2, and the compression of components is used during the synthesis. Initial compositions, obtained by deposition of MoS3 on the surface of HG stacks, are annealed at 400–600 °C and 100 bar. Using a set of characterization methods, the synthesis products are studied and it is found that the hole boundaries anchor MoS2 via covalent C–Mo coupling, while the applied pressure assists in the development of a thin MoS2 coating. The number of layers and their lateral dimensions are dependent on the synthesis temperature. The tests of Li-ion half-cells detected higher values of specific capacity for MoS2/HG hybrids synthesized under compression. Enhanced interaction between the components prevents the destruction of MoS2 during discharging–charging of electrodes, and the capacity increases due to the accommodation of lithium between the layers of MoS2 and HG. The structural features of MoS2/HG hybrids stipulate growth of specific capacity with long-term cycling to ≈1200 mA h g−1 at a current density of 0.5 A g−1.

KW - holey graphene

KW - hybrids

KW - Li-ion batteries

KW - MoS

KW - near-edge X-ray absorption fine structure

KW - X-ray photoelectron spectroscopy

KW - ANODE MATERIALS

KW - MoS2

KW - MOLYBDENUM-DISULFIDE

KW - ELECTROCHEMICAL PERFORMANCES

KW - GRAPHITE OXIDE

KW - COMPOSITES

KW - POROUS CARBON

KW - MOS2 NANOPARTICLES

KW - TRANSITION-METAL DICHALCOGENIDES

KW - MONOLAYER

KW - LITHIUM

UR - http://www.scopus.com/inward/record.url?scp=85070754026&partnerID=8YFLogxK

U2 - 10.1002/ente.201900659

DO - 10.1002/ente.201900659

M3 - Article

AN - SCOPUS:85070754026

VL - 7

JO - Energy Technology

JF - Energy Technology

SN - 2194-4288

IS - 10

M1 - 1900659

ER -