Abstract
AbstractSodium‐ion batteries (SIBs) are widely considered a promising option for large‐scale energy storage, but their energy density is limited by the low specific capacity anode material. Herein, we synthesize a compound, namely Co2Ni(BO3)2 (denoted as CNBO), which is firstly served as an anode material in SIBs. The in‐situ X‐ray diffraction (XRD) and ex‐situ X‐ray photoelectron spectroscopy (XPS) are conducted to elucidate the Na‐ion storage mechanism, which involves a conversion reaction with a theoretical specific capacity of 546 mAh g−1. As anode material for SIBs, CNBO exhibits a high initial reversible specific capacity of 544.2 mAh g−1 and maintains good cycling performance (319.2 mAh g−1 for 80 cycles at 0.2 A g−1) with remarkable rate capabilities (235.3 mAh g−1 at 2 A g−1). Furthermore, a sodium‐ion full cell using CNBO as the anode and Na3V2(PO4)3 as the cathode (CNBO||NVP) can attain a maximum energy density of 146 Wh kg−1 with excellent cycle stability and rate capabilities. This work presents the possibilities for developing metal borate‐based materials for efficient sodium‐ion storage.
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.
