5 years ago

Controllable N-Doped CuCo2O4@C Film as a Self-Supported Anode for Ultrastable Sodium-Ion Batteries

Controllable N-Doped CuCo2O4@C Film as a Self-Supported Anode for Ultrastable Sodium-Ion Batteries
Lifang Jiao, Kangzhe Cao, Yijing Wang, Xiaojun Wang
Rational synthesis of flexible electrodes is crucial to rapid growth of functional materials for energy-storage systems. Herein, a controllable fabrication is reported for the self-supported structure of CuCo2O4 nanodots (≈3 nm) delicately inserted into N-doped carbon nanofibers (named as 3-CCO@C); this composite is first used as binder-free anode for sodium-ion batteries (SIBs). Benefiting from the synergetic effect of ultrasmall CuCo2O4 nanoparticles and a tailored N-doped carbon matrix, the 3-CCO@C composite exhibits high cycling stability (capacity of 314 mA h g−1 at 1000 mA g−1 after 1000 cycles) and high rate capability (296 mA h g−1, even at 5000 mA g−1). Significantly, the Na storage mechanism is systematically explored, demonstrating that the irreversible reaction of CuCo2O4, which decomposes to Cu and Co, happens in the first discharge process, and then a reversible reaction between metallic Cu/Co and CuO/Co3O4 occurrs during the following cycles. This result is conducive to a mechanistic study of highly promising bimetallic-oxide anodes for rechargeable SIBs. Controllable synthesis of CuCo2O4@C film with CuCo2O4 nanodots (≈3 nm) homogeneously embedded in an N-doped carbon matrix is achieved by an electrospinning technique, and further evaluated as a self-supported anode for Na-ion batteries. The nanocomposite exhibits excellent electrochemical properties with high reversible capacity, high-rate capability, and long cyclic stability.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/smll.201700873

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