Zhang Yuxiang, Li Jiantao, Li Xintong, Shan Lina, Zhao Wenjia, Wang Jing, Gao Qiang, Cai Zhao, Zhou Chenggang, Han Bo, Amine Khalil, Sun Ruimin
Faculty of Materials Science and Chemistry, China University of Geosciences (Wuhan), Wuhan, Hubei 430074, China.
Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States.
Nano Lett. 2024 Mar 20;24(11):3331-3338. doi: 10.1021/acs.nanolett.3c04208. Epub 2024 Mar 8.
1T-MoS has become an ideal anode for sodium-ion batteries (SIBs). However, the metastable feature of 1T-MoS makes it difficult to directly synthesize under normal conditions. In addition, it easily transforms into 2H phase via restacking, resulting in inferior electrochemical performance. Herein, the electron configuration of Mo 4d orbitals is modulated and the stable 1T-MoS is constructed by nickel (Ni) introduction (1T-Ni-MoS). The original electron configuration of Mo 4d orbitals is changed via the electron injection by Ni, which triggers the phase transition from 2H to 1T phase, thus improving the electrical conductivity and accelerating the redox kinetics of the material. Consequently, 1T-Ni-MoS exhibits superior rate capability (266.8 mAh g at 10 A g) and excellent cycle life (358.7 mAh g at 1 A g after 350 cycles). In addition, the assembled NaV(PO)/C||1T-Ni-MoS full cells deliver excellent electrochemical properties and show great prospects in energy storage devices.
1T型二硫化钼已成为钠离子电池（SIBs）的理想阳极。然而，1T型二硫化钼的亚稳态特性使其在正常条件下难以直接合成。此外，它很容易通过重新堆叠转变为2H相，导致电化学性能较差。在此，通过引入镍（Ni）来调节钼4d轨道的电子构型，并构建稳定的1T型镍掺杂二硫化钼（1T-Ni-MoS）。通过镍的电子注入改变了钼4d轨道的原始电子构型，从而引发从2H相向1T相的相变，进而提高了材料的电导率并加速了氧化还原动力学。因此，1T-Ni-MoS表现出优异的倍率性能（在10 A g下为266.8 mAh g）和出色的循环寿命（在1 A g下循环350次后为358.7 mAh g）。此外，组装的NaV(PO)/C||1T-Ni-MoS全电池具有优异的电化学性能，并在储能装置中显示出巨大的前景。
