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首页> 外文期刊>RSC Advances >A novel compact cathode using sponge-like RANEY? nickel as the sulfur immobilizer for lithium–sulfur batteries
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A novel compact cathode using sponge-like RANEY? nickel as the sulfur immobilizer for lithium–sulfur batteries

机译：使用海绵状RANEY的新型紧凑型阴极？镍作为锂硫电池的固硫剂

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摘要

A novel sulfur immobilizer named RANEY? nickel is introduced for lithium–sulfur batteries for the first time. The sulfur/RANEY? nickel (S/RN) composite is prepared via an accessible solvent method. The key feature of RANEY? nickel is that it contains poriferous channels, which act as barriers against the loss of active materials due to physical and chemical adsorption during discharge/charge cycling. The chemical adsorption of RANEY? nickel for sulfur, verified using X-ray photoelectron spectroscopy (XPS), leads to the generation of Ni–S chemical bonds. In addition, RANEY? nickel, possessing excellent conductivity, can improve the reaction kinetics of an electrode with a high rate capability. As a result, the S/RN cathode presents an initial discharge capacity of 1469 mA h g?1, achieving a minimal capacity fade of 0.12% per cycle after 500 cycles at the rate of 0.5C with an excellent coulombic efficiency of around 99%. Furthermore, the S/RN cathode is promising for use in compact batteries due to its high volumetric specific capacity.
机译：一种名为RANEY的新型硫磺固定剂。镍首次用于锂硫电池。硫磺/ RANEY？镍（S / RN）复合物通过可及的溶剂法 制备。 RANEY的主要功能是什么？镍是含有多孔通道的通道，该通道可阻止放电/充电循环过程中由于物理和化学吸附而导致活性物质损失。 RANEY的化学吸附？ X射线光电子能谱（XPS）验证了镍中的硫，导致生成Ni–S化学键。另外，RANEY？具有优异电导率的镍可以改善具有高倍率能力的电极的反应动力学。结果，S / RN阴极的初始放电容量为1469 mA hg ？1 ，在500次循环后，每个循环的最小容量衰减为0.12％。速率为0.5C，库仑效率高达99％左右。此外，由于其高的体积比容量，S / RN阴极有望用于紧凑型电池。

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