1T‐2H Mixed‐Phase MoS₂ Stabilized with a Hyperbranched Polyethylene Ionomer for Mg²⁺/Li⁺ Co‐Intercalation Toward High‐Capacity Dual‐Salt Batteries

Abstract

Dual‐salt magnesium/lithium‐ion batteries (MLIBs) benefit from fast lithium ion diffusion on the cathode side while providing safety due to the dendrite‐free Mg2+ stripping/plating mechanism on the anode side. Bulk MoS2 (B‐MoS2), as a cathode for magnesium‐ion batteries (MIBs), suffers from low conductivity and relatively van der Waals gaps and, consequently, resists against divalent Mg2+ insertion due to the high Coulombic interactions. In MLIBs, it exhibits a Daniell‐cell type mechanism with the sole accommodation of Li+. In this paper, the synthesis of a 1T/2H mixed‐phase MoS2(MP‐MoS2) modified with a hyperbranched polyethylene ionomer, I@MP‐MoS2, for high‐capacity MLIBs with a distinct Mg2+/Li+ co‐intercalation mechanism is reported. Benefiting from the enhanced conductivity (due to 53% metallic 1T phase), expanded van der Waals gaps (79% expansion compared to B‐MoS2, 1.11 vs 0.62 nm), and enhanced interactions with THF‐based electrolytes following the modification, I@MP‐MoS2 shows a dramatically increased Mg2+ storage compared to its parent analogue (144 mAh g−1 vs ≈2 mAh g−1 at 20 mA g−1). In MLIBs, I@MP‐MoS2 is demonstrated to exhibit remarkable specific capacities up to ≈270 mAh g−1 at 20 mA g−1 through a Mg2+/Li+ co‐intercalation mechanism with 87% of capacity retention over 200 cycles at 100 mA g−1.

Two Birds with One Stone: A Dual-Functional Washing Fluid for Shoreline Oil Spill Response

“…XPS analysis was conducted to investigate the chemical states of Mo and S in the products (Figure c,d). The high-resolution XPS spectra of Mo 3d display two 1T phase peaks at 231.5 and 228.3 eV and two 2H phase peaks at 232.7 and 229.6 eV. , Two peaks at 162.4 and 161.2 eV in S 2p spectra are the characteristics of spin–orbit S 2p 1/2 and S 2p 3/2 of 1T MoS 2 , respectively, and two peaks at 161.8 and 163.2 eV are corresponding to 2H MoS 2 . These results can prove 1 T /2H mixed-phase MoS 2 .…”

Novel Electrospun Sn-Based Composite Cathodes Exhibiting Extended Cycle Life for Hybrid Magnesium–Lithium Batteries

“…The cycling stability of MLIBs is an important indication of the effectiveness of cathode material modification, which is also an important criterion for practical application in production. The cycling performance of MLIBs was compared with that reported in ref ,,– . The relevant comparison results are listed in Table .…”