用于Li-S电池中硫化铜（CuS）添加剂的结构和化学演化的Operando多模式同步加速器研究。,Scientific Reports

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用于Li-S电池中硫化铜（CuS）添加剂的结构和化学演化的Operando多模式同步加速器研究。
Scientific Reports ( IF 3.8 ) Pub Date : 2017-Oct-11 , DOI: 10.1038/s41598-017-12738-0
Ke Sun , Chonghang Zhao , Cheng-Hung Lin , Eli Stavitski , Garth J. Williams , Jianming Bai , Eric Dooryhee , Klaus Attenkofer , Juergen Thieme , Yu-chen Karen Chen-Wiegart , Hong Gan

导电金属硫化物是有望用于未来锂硫（Li-S）电池的多功能添加剂。这些可以增加硫阴极的电导率，以改善电池的功率容量，并有助于整体电池放电容量。这种多功能电极设计显示了最初的希望；但是，系统级别的复杂交互会伴随一些有害的副作用。以化学转化为反应机理的金属硫化物添加剂，例如CuS和FeS ₂，可以增加Li-S系统的理论容量。但是，这些添加剂可能引起不希望的寄生反应，例如添加剂在电解质中的溶解。研究这种复杂的反应是一个挑战，因为它需要实验方法，这些方法可以跟踪电化学过程中系统的化学和结构演变。为了解决这些系统中的基本机理，我们采用了一种操作性多峰x射线表征方法来研究利用粉末衍射和荧光成像的金属硫化物的结构和化学演化，从而解决了前者的问题，而吸收光谱则解决了后者在锂化过程中的吸收光谱问题。 CuS作为多功能阴极添加剂的Li-S电池的去锂化。

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Operando Multi-modal Synchrotron Investigation for Structural and Chemical Evolution of Cupric Sulfide (CuS) Additive in Li-S battery.

Conductive metal sulfides are promising multi-functional additives for future lithium-sulfur (Li-S) batteries. These can increase the sulfur cathode's electrical conductivity to improve the battery's power capability, as well as contribute to the overall cell-discharge capacity. This multi-functional electrode design showed initial promise; however, complicated interactions at the system level are accompanied by some detrimental side effects. The metal sulfide additives with a chemical conversion as the reaction mechanism, e.g., CuS and FeS₂, can increase the theoretical capacity of the Li-S system. However, these additives may cause undesired parasitic reactions, such as the dissolution of the additive in the electrolyte. Studying such complex reactions presents a challenge because it requires experimental methods that can track the chemical and structural evolution of the system during an electrochemical process. To address the fundamental mechanisms in these systems, we employed an operando multimodal x-ray characterization approach to study the structural and chemical evolution of the metal sulfide-utilizing powder diffraction and fluorescence imaging to resolve the former and absorption spectroscopy the latter-during lithiation and de-lithiation of a Li-S battery with CuS as the multi-functional cathode additive. The resulting elucidation of the structural and chemical evolution of the system leads to a new description of the reaction mechanism.

更新日期：2017-10-11

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