The 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. Recently, 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.
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