Details

Autor(en) / Beteiligte

• Stolyarova, Svetlana G.
• Koroteev, Victor O.
• Shubin, Yury V.
• Plyusnin, Pavel E.
• Makarova, Anna A.
• Okotrub, Alexander V.
• Bulusheva, Lyubov G.

Titel

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

Ist Teil von

• Energy technology (Weinheim, Germany), 2019-10, Vol.7 (10), p.n/a

Ort / Verlag

Weinheim: Wiley Subscription Services, Inc

Erscheinungsjahr

2019

Link zum Volltext

Quelle

Wiley Online Library - AutoHoldings Journals

Beschreibungen/Notizen

• 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. A strong interfacial interaction between holey graphene and MoS2 is achieved using the hot pressing method. The nanoscale holes anchor and stabilize MoS2 which contribute to the continuous growth of the specific capacity of the hybrid anode material during hundreds of repeating charge–discharge cycles of the Li‐ion battery.