To 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⁻¹ and a reversible capacity of ≈570 mA h g⁻¹ after 300 charge/discharge cycles at 0.5 C, and maintains 450 mA h g⁻¹ even 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.

中文翻译：

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具有高锂离子扩散系数的Ni @ NiSn复合材料的合成，用于快速充电的锂离子电池。

从本质上解决锂离子电池快速充电的问题，开发具有更高锂离子扩散系数的新型电极材料是关键。在这项工作中，通过两步工艺设计合成了一种新型的花状Ni @ SnNi结构，该结构包括通过喷雾热解法制备Ni核，然后通过简单的氧化还原反应形成SnNi壳。所获得的Ni @ SnNi复合材料在0.5 C的300次充电/放电循环后表现出的初始容量为约693 mA hg ^-1和可逆容量为约570 mA hg ^-1，并且即使在高速率下也保持450 mA hg ^-1 3。此外，证明了一个镍@ SnNi复合具有较高的锂离子扩散系数（≈10 ^-8），远高于之前报道的（≈10 ^-10），这主要归因于独特的花状Ni @ SnNi结构。此外，还测试了容量比为1.13（阳极/阴极）的全电池性能（Ni @ SnNi-9h /石墨与LiCoO ₂）。发现即使在2C速率的充电/放电下，在100次循环下的容量保持率仍然接近89％。这意味着Ni @ SnNi-9h是具有高能量密度和功率密度的锂离子电池的有希望的负极添加剂。