Investigation of the Effects of Copper Nanoparticles on Magnesium–Sulfur Battery Performance: How Practical Is Metallic Copper Addition?
Investigation of the Effects of Copper Nanoparticles on Magnesium–Sulfur Battery Performance: How Practical Is Metallic Copper Addition?
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DOI：
10.1021/acsaem.9b01236
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发表时间：
2019-06
影响因子：
6.4
通讯作者：
P. He;Hunter O. Ford;L. Merrill;J. Schaefer
中科院分区：
文献类型：
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作者：
P. He;Hunter O. Ford;L. Merrill;J. Schaefer
由于镁硫磺(MG/S)电池的二次氧化困难和多硫化物穿梭，导致电池容量衰减较快。其他研究报告称，在阴极上使用铜集电体或CuS可以提高循环能力。本文研究了在纳米碳纤维(Cu@CNF)上生长的铜纳米颗粒作为镁/S电池正极添加剂的研究，以测试在可控铜负载下金属铜对容量和倍率性能的影响。添加铜的镁/S电池可在1C下循环100次，容量为452mAh/g。X射线光电子能谱证实，Cu2S是在阴极形成过程中形成的，对高的初始容量有贡献，但随后又转化为金属铜。在延长循环时，铜添加剂促进形成更小、更分散的放电产物颗粒，从而增强可逆性。最后发现，要实现铜添加剂的实质性和持续性效益，阴极上的S和铜的负载量必须很低。
Rechargeable magnesium sulfur (Mg/S) batteries suffer from fast capacity fading due to difficulty of reoxidation of MgS and the polysulfide shuttle. Other works have reported that use of Cu current collectors or CuS at the cathode improves cycleability. Here we investigate Cu nanoparticles grown on carbon nanofibers (Cu@CNF) as an additive for the Mg/S battery cathode to test the effects of Cu metal on capacity and rate performance at controlled Cu loading. The Mg/S battery with Cu additives can run at 1 C with a capacity of 452 mAh/g after 100 cycles. It was confirmed via X-ray photoelectron spectroscopy that Cu2S forms during cathode formation and contributes to the high initial capacity, but then converts back to metallic Cu. Upon extending cycling, the Cu additives promote the formation of smaller, more dispersed discharge product particles, thereby enhancing reversibility. Finally, it is found that the loading of S and Cu at the cathode must be low to achieve substantial and sustained benefits of the Cu additives.