Zeolitic Imidazolate Framework 67-Derived Ce-Doped CoP@N-Doped Carbon Hollow Polyhedron as High-Performance Anodes for Lithium-Ion Batteries

• Published in: Crystals (Basel) 2022-04, Vol.12 (4), p.533
• Main Authors: Zhai, Yanjun, Zhou, Shuli, Guo, Linlin, Xin, Xiaole, Zeng, Suyuan, Qu, Konggang, Wang, Nana, Zhang, Xianxi
• Format: Article
• Language: English
• Subjects: anode; Anodes; Carbon; Ce-doped CoP; Cerium; Charge transfer; Composite materials; Electrodes; Energy storage; hollow polyhedron; Ion diffusion; Lithium-ion batteries; Low temperature; Metal-organic frameworks; Morphology; N-doped carbon; Nanoparticles; Nanostructured materials; Nitrogen; Phosphating (coating); Phosphides; Polyhedra; Rare earth elements; Rechargeable batteries; Scanning electron microscopy; Spectrum analysis; Transition metals; Transmission electron microscopy; Zeolites
• ISSN: 2073-4352; 2073-4352
• DOI: 10.3390/cryst12040533

Zeolitic Imidazolate Framework 67 (ZIF-67) and its derivates have attracted extensive interest for lithium-ion batteries (LIBs). Here, Cerium-doped cobalt phosphide@nitrogen-doped carbon (Ce-doped CoP@NC) with hollow polyhedron structure materials were successfully synthesized via ionic-exchange with Co and Ce ions using the ZIF-67 as a template followed with a facile low-temperature phosphorization treatment. Benefitting from the well-designed hollow polyhedron, steady carbon network, and Ce-doping structural merits, the as-synthesized Ce-doped CoP@NC electrode demonstrated superior performance as the anode in LIBs: a superior cyclability (400 mA h g−1 after 500 cycles) and outstanding rate-capability (590 mA h g−1, reverted to 100 mA g−1). These features not only produced more lithium-active sites for LIBs anode and a shorter Li-ion diffusion pathway to expedite the charge transfer, but also the better tolerance against volume variation of CoP during the repeated lithiation/delithiation process and greater electronic conductivity properties. These results provide a methodology for the design of well-organized ZIFs and rare earth element-doped transition metal phosphate with a hollow polyhedron structure.