科研之友
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摘要
Due to the existing of multivalent states, V-based materials are considered ideal candidates for high-capacity lithium ions batteries (LIBs) anode materials. In this paper, we reported a novel anode material, CeVO3, which can be used for both LIBs and sodium ions batteries (SIBs). As anode material for LIBs, CeVO3 exhibits an excellent electrochemical performance that the average reversible discharge capacity of 300 mAh/g can be obtained at 0.1 C rate. As an anode material for SIBs, although the reversible capacity is lower than that for LIBs, the cycle stability and rate performance is obviously improved. At 0.1 C rate, as an anode material for SIBs, the mean capacity fade of CeVO3 is about 0.3% per cycle and with the increase of the current rates, the cycle stability further improved. In addition, using the nudged elastic band method, we calculated the diffusion path and diffusion energy barriers of lithium ions and sodium ions in CeVO3 crystalline where three ions diffusion pathways for SIBs (path 1, path 2 and path 3) can be obtained while for LIBs only one ions diffusion pathway (path 3) be obtained. And we also analyzed their impacts on reversible capacity and cycle stability of CeVO3 as an anode material for both LIBs and SIBs where, due to the single Li ions diffusion path, the reversible capacity of CeVO3 for LIBs decreases faster than that for SIBs with the increase of the current rates.
