Engineering of Metal–Organic Framework-Derived CoTiO<sub>3</sub> Micro-Prisms for Lithium-Ion Batteries
Metal–organic framework (MOF)-derived transition metal compounds and their composites have attracted great interest for applications in energy conversion and storage. In this work, hexagonal micro-prisms of Ni-doped CoTiO<sub>3</sub> composited with amorphous carbon (Ni<sub>x</s...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-12-01
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| Series: | Molecules |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1420-3049/30/1/34 |
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| Summary: | Metal–organic framework (MOF)-derived transition metal compounds and their composites have attracted great interest for applications in energy conversion and storage. In this work, hexagonal micro-prisms of Ni-doped CoTiO<sub>3</sub> composited with amorphous carbon (Ni<sub>x</sub>CTO/C) were synthesized using Ti-Co-based MOFs as precursors. The experimental results indicate the substitutional doping of Ni<sup>2+</sup> for Co<sup>2+</sup> in CoTiO<sub>3</sub> (CTO), leading to improved conductivity, as further confirmed by density functional theory calculations. Thus, the carbon-free sample of Ni-doped CTO exhibits improved lithium storage properties compared to the pristine one. Furthermore, when coupled with in situ-formed carbon, the dually modified Ni<sub>0.05</sub>CTO/C micro-prisms demonstrated a significantly increased reversible capacity of 584.8 mA h g<sup>−1</sup>, excellent rate capability, and superior cycling stability at a high current density of 500 mA g<sup>−1</sup>. This enhanced electrochemical performance can be attributed to the synergistic effect of Ni doping and carbon coating. |
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| ISSN: | 1420-3049 |