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首页> 外文期刊>Advanced energy materials >Hollow CuS Nanoboxes as Li-Free Cathode for High-Rate and Long-Life Lithium Metal Batteries
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Hollow CuS Nanoboxes as Li-Free Cathode for High-Rate and Long-Life Lithium Metal Batteries

机译：空心CuS纳米盒作为无铅阴极，适用于高速率和长寿命的锂金属电池

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摘要

Transition metal sulfides hold promising potentials as Li-free conversion-type cathode materials for high energy density lithium metal batteries. However, the practical deployment of these materials is hampered by their poor rate capability and short cycling life. In this work, the authors take the advantage of hollow structure of CuS nanoboxes to accommodate the volume expansion and facilitate the ion diffusion during discharge-charge processes. As a result, the hollow CuS nanoboxes achieve excellent rate performance (approximate to 371 mAh g(-1) at 20 C) and ultra-long cycle life (>1000 cycles). The structure and valence evolution of the CuS nanobox cathode are identified by scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. Furthermore, the lithium storage mechanism is revealed by galvanostatic intermittent titration technique and operando Raman spectroscopy for the initial charge-discharge process and the following reversible processes. These results suggest that the hollow CuS nanobox material is a promising candidate as a low-cost Li-free cathode material for high-rate and long-life lithium metal batteries.
机译：过渡金属硫化物作为高能量密度锂金属电池的无锂转化型正极材料具有广阔的前景。然而，这些材料的实际应用受到其差的速率能力和短的循环寿命的阻碍。在这项工作中，作者利用了CuS纳米盒的空心结构来适应体积膨胀，并在放电过程中促进了离子扩散。结果，空心CuS纳米盒实现了出色的速率性能（在20 C时约为371 mAh g（-1））和超长循环寿命（> 1000次循环）。通过扫描电子显微镜，透射电子显微镜和X射线光电子能谱确定了CuS纳米盒阴极的结构和化合价。此外，通过恒电流间歇滴定技术和拉曼光谱对初始的充放电过程和随后的可逆过程揭示了锂的存储机理。这些结果表明，空心CuS纳米盒材料有望成为一种低成本，无锂的正极材料，用于高速率和长寿命的锂金属电池。

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