Abstract
AbstractNaCrO2 is a promising O3‐type cathode material in sodium‐ion batteries. However, it suffers from rapid capacity fading due to the unstable structure upon cycling. This work shows that in situ carbon coating during the synthesis process has multiple synergistic effects and can effectively stabilize the material structure and improve the cyclability. It is found that sodium vacancy and carbon coating in NaCrO2 synchronously occur, which improve its sodium‐ion transport kinetics, structural stability during cycling and the air stability. More importantly, the strategy is universal in that various sources of carbon display similar effect. As a result, the asphalt‐derived carbon coated material has a high initial capacity of 129 mAh g−1 at 0.1 C rate with an initial Coulombic efficiency up to 98.2 %. In addition, it shows an excellent rate capability and cycling performance with 81.1 % retention after 1000 cycles at 5 C in half cell. Moreover, a full cell has constructed by coupling with hard carbon anode, which shows a high discharge capacity of 121.9 mAh g−1 with a high Coulomb efficiency of 94.7 %, excellent rate capability and good cycling stability. This work demonstrates a general modification method on NaCrO2 that has the potential for practical applications.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
