Insight into Nickel?Cobalt Oxysulfide Nanowires as Advanced Anode for Sodium?Ion Capacitors
نویسندگان
چکیده
Transition metal oxides have a great potential in sodium-ion capacitors (SICs) due to their pronouncedly higher capacity and low cost. However, poor conductivity fragile structure hinder development. Herein, core-shell-like nickel-cobalt oxysulfide (NCOS) nanowires are synthesized demonstrated as an advanced SICs anode. The bimetallic with multiple cation valence can promote the sodium ion adsorption redox reaction, massive defects enable accommodation of volume change sodiation/desodiation process, meanwhile provides abundant channels for fast transfer ions, thereby synergistically making NCOS electrode exhibit high reversible storage (1468.5 mAh g?1 at 0.1 A g?1) excellent cyclability (90.5% retention after 1000 cycles). in-situ X-ray diffraction analysis unravels insertion conversion mechanism NCOS, enhanced capability is further verified by kinetic theoretical calculations. Finally, consisting anode boron-nitrogen co-doped carbon nanotubes cathode deliver energy density 205.7 Wh kg?1, power 22.5 kW outstanding cycling lifespan. These results indicate efficient strategy designing high-performance based on dianion compounds.
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ژورنال
عنوان ژورنال: Advanced Energy Materials
سال: 2021
ISSN: ['1614-6832', '1614-6840']
DOI: https://doi.org/10.1002/aenm.202100408