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Controllable N‐Doped CuCo 2 O 4 @C Film as a Self‐Supported Anode for Ultrastable Sodium‐Ion Batteries
Author(s) -
Wang Xiaojun,
Cao Kangzhe,
Wang Yijing,
Jiao Lifang
Publication year - 2017
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201700873
Subject(s) - anode , materials science , nanodot , bimetallic strip , composite number , oxide , doping , chemical engineering , nanoparticle , fabrication , energy storage , carbon nanofiber , electrode , nanotechnology , carbon fibers , metal , composite material , carbon nanotube , chemistry , metallurgy , optoelectronics , medicine , power (physics) , alternative medicine , physics , engineering , pathology , quantum mechanics
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 CuCo 2 O 4 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 CuCo 2 O 4 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 CuCo 2 O 4 , which decomposes to Cu and Co, happens in the first discharge process, and then a reversible reaction between metallic Cu/Co and CuO/Co 3 O 4 occurrs during the following cycles. This result is conducive to a mechanistic study of highly promising bimetallic‐oxide anodes for rechargeable SIBs.