IntroductionThe limited and uneven distribution of lithium resources over the world leads to Li-ion batteries (LIBs) uneconomical as a large-scale off-peak power. Sodium-ion batteries (SIBs), which take advantage of similar chemical properties as LIBs but more abundance and lower cost of sodium, indicates a promising alternative for LIBs.1Recently, considerable efforts start to shift to develop SIBs and their electrode materials. For cathode, most of these researches focused on conventional sodium-intercalation compounds, which suffer from poor rate performance and short cycle life. It is still highly desirable to develop high-performance cathodes for the SIBs.Aromatic carbonyl-based organic cathodes have attracted great attention for LIBs, which may exhibit promising performance for SIBs. Here we developed an aromatic carbonyl-based organic cathode for SIBs.ExperimentalThe aromatic carbonyl-based cathode (70%) was mixed with 20 wt% carbon black (Super-P) and 10 wt% PVDF to prepare the electrodes. The electrochemical tests were performed in 2032 coin cells. The cells have a sodium pellet as the counter electrode and a glass-fiber separator, and the solution (1 M) of NaPF6in ethylene carbonate (EC)/ diethyl carbonate (DEC) (1:1 in volume) as the electrolyte. Galvanostatic cycling was conducted on an Arbin BT2000 system at room temperature.Results and DiscussionAs shown in figure 1, a potential plateau at 2.3 V can be observed in the first discharge curve, which corresponds to sodium insertion to the structure. In the second cycle, the cathode can deliver a capacity of ~145 mAh/g at a current density of 10 mA/g. When cycling at 200 mAh/g after 5 cycles at 20 mA/g, the material exhibits a stable cycling performance (figure 2). Figure 1.   Discharge/charge curves of the aromatic carbonyl-based cathode cycled at 10 mA/g.     Figure 2.  Cycling performance of the aromatic carbonyl-based cathode.ConclusionsAn aromatic carbonyl-based organic material has been developed as a 2.3 V cathode for SIBs. It delivers a reversible capacity of ~140 mAh/g and a stable cycle life, indicating a promising cathode for SIBs.References1, Slater, M. D.; Kim, D.; Lee, E.; Johnson, C. S. Adv. Funct. Mater. 2013  , 23, 947.

High-performance aromatic carbonyl-based organic cathode for sodium-ion batteries

248th National Meeting (2014)

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