Ultrastable and ultrafast 3D charge-discharge network of robust chemically coupled 1 T-MoS2/Ti3C2 MXene heterostructure for aqueous Zn-ion batteries

作者：Long, Fei^*; Zhang, Qixiang; Shi, Junjie; Wen, Li; Wu, Yonghui; Ren, Ziqi; Liu, Zunyu; Hou, Yixin; Mao, Ke; Niu, Ke; Liu, Nishuang; Zhang, Zhi; Li, Luying; Su, Jun; Gao, Yihua^*

来源：Chemical Engineering Journal, 2023, 455: 140539.

DOI：10.1016/j.cej.2022.140539

• Zn-ion batteries
• Flexibility
• Heterostructure
• MoS2
• MXene

Aqueous zinc-ion batteries (AZIBs) are a green, low-cost and high-safety energy storage technology. Although MoS2 is a promising electrode material, low conductivity and poor stability still limit their application in AZIBs. Constructing conductive heterostructures is an effective strategy to overcome these problems. Herein, metallic 1 T-MoS2 nanosheets are innovatively combined with conductive Ti3C2 MXene, resulting in enlarged 1 T-MoS2 interlayers (from 9.5 to 9.9 angstrom) and enhanced hydrophilicity. This novel 1 T-MoS2/Ti3C2 MXene heterostructure exhibits exceptional high-rate capability (284.3 mAh/g at 0.10 A/g with 105.2 mAh/g at 10.00 A/g) and long-term cycling stability (93.2 % capacity retention after 3000 cycles). High capacity comes from the expanded ion storage space caused by the extended layer spacing of the metallic 1 T-MoS2. Outstanding rate capability thanks to ultrafast electrons and ions transport from Ti3C2 MXene. Prominent long-term cycling stability is attributed to the efficient synergistic effect of 1 T-MoS2 and Ti3C2 MXene in the 3D interconnected networks. As a proof of concept, the wearable quasi-solid-state Zn-ion battery employing the 1 T-MoS2/Ti3C2 MXene cathode exhibits stable electrochemical performance under different bending conditions. This work explores a new route to design high-performance layered cathode materials for AZIBs.

• 单位
  桂林理工大学; 华中科技大学