講演情報
[7p-N406-2]Few-Layered Mo2Ti2C3Tx-MXene/MoS2 Heterostructures as an Efficient
Anode for Lithium-Ion Batteries
〇Sengottaiyan Chinnasamy1, Masanori Hara1, Masamichi Yoshimura1 (1.Toyota Tech. Inst.)
キーワード：
MXene、MoS2、Li-ion batteries
MXenes have been attracting attention as next-generation materials due to the combination of metal and carbon showing high structural stability.[1,2] In particular, bimetallic with carbide MXenes exhibit excellent chemical stability and structural retention in electrochemical devices, including batteries that require high-rate operation.[1] However, obtaining MXenes with few layers and large size remains a practical challenge (Figure 1a), and there are limitations to their application in terms of synthesis scalability and morphology control. On the other hand, MoS2 is a promising anode material (Figure 1b) with a high capacity but disparate structural and chemical stability during cycling. Combining MoS2 with MXene (Figure 1c) has improved the structural stability at the interface, and the electron and ion transport pathways help to improve the high-capacity anode material. The MoS2/MXene electrode shows a high discharge capacity of about 1100 mAh g-1, which is significantly better than that of MXene (380 mAh g-1) and MoS2 (675 mAh g-1). MXene has high electrical conductivity, and its intimate contact with the MoS2 layer might have improved the efficiency of electron transfer, while the interface formed by the heterostructure may reduce the diffusion barrier of lithium ions. In this study, we are observing the detailed studies based on long-term cycling tests and post-mortem investigation to elucidate the better reaction mechanism.