Monodisperse CoSn and NiSn nanoparticles were prepared in solution and supported on commercial carbon black. The obtained nanocomposites were applied as anodes for Li- and K-ion batteries. CoSn@C delivered stable average capacities of 850, 650, and 500 mAh g-1 at 0.2, 1.0, and 2.0 A g-1, respectively, well above those of commercial graphite anodes. The capacity of NiSn@C retained up to 575 mAh g-1 at a current of 1.0 A g-1 over 200 continuous cycles. Up to 74.5 and 69.7% pseudocapacitance contributions for Li-ion batteries were measured for CoSn@C and NiSn@C, respectively, at 1.0 mV s-1. CoSn@C was further tested in full-cell lithium-ion batteries with a LiFePO4 cathode to yield a stable capacity of 350 mAh g-1 at a rate of 0.2 A g-1. As electrode in K-ion batteries, CoSn@C composites presented a stable capacity of around 200 mAh g-1 at 0.2 A g-1 over 400 continuous cycles, and NiSn@C delivered a lower capacity of around 100 mAh g-1 over 300 cycles.

中文翻译：

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负载在商业碳上的单分散CoSn和NiSn纳米颗粒作为锂离子和钾离子电池的阳极。

在溶液中制备单分散CoSn和NiSn纳米颗粒，并负载在商品炭黑上。将获得的纳米复合材料用作锂离子和钾离子电池的阳极。CoSn @ C在0.2、1.0和2.0 A g-1时分别提供了850、650和500 mAh g-1的稳定平均容量，远高于商用石墨阳极的平均容量。NiSn @ C的容量在200个连续循环中以1.0 A g-1的电流保持了575 mAh g-1的容量。在1.0 mV s-1时，分别测量了CoSn @ C和NiSn @ C对锂离子电池的伪电容贡献分别为74.5和69.7％。在带有LiFePO4阴极的全电池锂离子电池中，对CoSn @ C进行了进一步测试，以0.2 A g-1的速率产生了350 mAh g-1的稳定容量。作为K离子电池的电极，CoSn @ C复合材料在0时的稳定容量约为200 mAh g-1。