A Study of Ni-Doping Effects in Na2Mn3-XNixO7 Layered Cathode for Sodium-Ion Battery

Abstract

Advanced cathode materials play a key role in enhancing the performance of Sodium-ion batteries (SIBs) [1]. Owing to their special layered structure, good electrochemical activity and appealing rate capabilities with stable cycling performance the layered transition metal oxides have been extensively studied. Among them Na2Mn3O7 is one of the promising cathode materials due to the low cost and high capacity [2]. However, the Jahn-Teller effect caused by Mn3+ leads to rapid capacity fading [3]. In this regard, partially substitution of transition metal elements into Mn-rich layered oxides were successfully reported as an effective method to inhibit the Jahn–Teller effect and improve cyclability [4].This research investigates developing Ni-substituted P1-type Na2Mn3-xNixO7 material where they are synthesized via sol-gel method. The effects of Ni-substitution amount on the structure / morphology and electrochemical properties of the cathode material are systematically studied. Acknowledgment This work was supported by the Nazarbayev University Faculty-development competitive research grant (080420FD1914) “Rational design of new anionic-redox based active material for rechargeable sodium-ion batteries” and by the Ministry of Education and Science of the Republic of Kazakhstan Grant (AP08856179), “Boosting the electrochemical performance of the cathode material for beyond lithium-ion batteries”. The author (AK) thank the social policy grant awarded to him by Nazarbayev University.