摘要：AbstractTo solve the problems of fast‐charging of lithium‐ion batteries in essence, development of new electrode materials with higher lithium‐ion diffusion coefficients is the key. In this work, a novel flower‐like Ni@SnNi structure is synthesized via a two‐step process design, which consists of the fabrication of Ni cores by spray pyrolysis followed by the formation of SnNi shells via a simple oxidation–reduction reaction. The obtained Ni@SnNi composite exhibits an initial capacity of ≈693 mA h g−1and a reversible capacity of ≈570 mA h g−1after 300 charge/discharge cycles at 0.5 C, and maintains 450 mA h g−1even at a high rate of 3 C. Further, it is proved that a Ni@SnNi composite possesses high lithium‐ion diffusion coefficient (≈10−8), which is much higher than those (≈10−10) reported previously, which can be mainly attributed to the unique flower‐like Ni@SnNi structure. In addition, the full cell performance (Ni@SnNi‐9h/graphite vs LiCoO2) with a capacity ratio of 1.13 (anode/cathode) is also tested. It is found that even at 2 C rate charging/discharging, the capacity retention at 100 cycles is still close to 89%. It means that Ni@SnNi‐9h is a promising anode additive for lithium‐ion batteries with high energy density and power density.In this work, a novel flower‐like Ni@SnNi structure is synthesized via a two‐step process design. The obtained Ni@SnNi composite exhibits an initial capacity of ≈693 mA h g−1and a reversible capacity of ≈570 mA h g−1after 300 charge/discharge cycles at 0.5 C, and maintains 450 mA h g−1even at a high rate of 3 C.
关键词：fast‐chargingion diffusion coefficientlithium ion batteriesNi@NiSn compositeSn–Ni
