3D Porous Ti<sub>3</sub>C<sub>2</sub> MXene/NiCo-MOF Composites for Enhanced Lithium Storage

oleh: Yijun Liu, Ying He, Elif Vargun, Tomas Plachy, Petr Saha, Qilin Cheng

Format: Article
Diterbitkan: MDPI AG 2020-04-01

Deskripsi

To improve Li storage capacity and the structural stability of Ti<sub>3</sub>C<sub>2</sub> MXene-based electrode materials for lithium-ion batteries (LIBs), a facile strategy is developed to construct three-dimensional (3D) hierarchical porous Ti<sub>3</sub>C<sub>2</sub>/bimetal-organic framework (NiCo-MOF) nanoarchitectures as anodes for high-performance LIBs. 2D Ti<sub>3</sub>C<sub>2</sub> nanosheets are coupled with NiCo-MOF nanoflakes induced by hydrogen bonds to form 3D Ti<sub>3</sub>C<sub>2</sub>/NiCo-MOF composite films through vacuum-assisted filtration technology. The morphology and electrochemical properties of Ti<sub>3</sub>C<sub>2</sub>/NiCo-MOF are influenced by the mass ratio of MOF to Ti<sub>3</sub>C<sub>2</sub>. Owing to the interconnected porous structures with a high specific surface area, rapid charge transfer process, and Li<sup>+</sup> diffusion rate, the Ti<sub>3</sub>C<sub>2</sub>/NiCo-MOF-0.4 electrode delivers a high reversible capacity of 402 mAh g<sup>−1</sup> at 0.1 A g<sup>−1</sup> after 300 cycles; excellent rate performance (256 mAh g<sup>−1</sup> at 1 A g<sup>−1</sup>); and long-term stability with a capacity retention of 85.7% even after 400 cycles at a high current density, much higher than pristine Ti<sub>3</sub>C<sub>2</sub> MXene. The results highlight that Ti<sub>3</sub>C<sub>2</sub>/NiCo-MOF have great potential in the development of high-performance energy storage devices.