Wang Yunhui, Feng Xinran, Xiong Yin, Stoupin Stanislav, Huang Rong, Zhao Min, Xu Mingsheng, Zhang Peng, Zhao Jinbao, Abruña Héctor D
College of Chemistry and Chemical Engineering, College of Energy, State Key Lab of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, State-Province Joint Engineering Laboratory of Power Source Technology for New Energy Vehicle, Engineering Research Center of Electrochemical Technology (Ministry of Education), Xiamen University, Xiamen, Fujian 361005, China.
Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853, United States.
ACS Appl Mater Interfaces. 2020 Apr 15;12(15):17396-17405. doi: 10.1021/acsami.9b21982. Epub 2020 Apr 6.
CuS is considered as one of the potential anode paradigms for advanced rechargeable batteries because of its high theoretical capacity (∼335 mAh·g), high and flat charge/discharge voltage plateaus (∼1.7 V vs Li/Li), stable cycling performance, and its elemental abundance. However, many studies have shown that CuS exhibits a dramatic capacity fade in carbonate-based electrolytes, which has precluded its commercialization when paired with high voltage cathodes in state-of-the-art lithium ion batteries. Here, we report on a fundamental mechanistic study of the electrochemical processes of CuS in both ether- and carbonate-based electrolytes employing synchrotron X-ray methods. Based on our findings, we developed a CuS/C composite material that suppresses its failure mechanism in carbonate-based electrolytes and further demonstrated its feasibility in lithium ion full cells for the first time. Our experiment provides the basis for the utilization of CuS in industrial-scale applications for large-scale electrical energy storage.
硫化铜因其高理论容量（约335 mAh·g）、高且平坦的充放电电压平台（相对于Li/Li约为1.7 V）、稳定的循环性能及其元素丰度，被认为是先进可充电电池潜在的负极材料之一。然而，许多研究表明，硫化铜在碳酸盐基电解质中表现出显著的容量衰减，这使得其在与最先进的锂离子电池中的高压正极配对时无法实现商业化。在此，我们报道了一项利用同步加速器X射线方法对硫化铜在醚基和碳酸盐基电解质中的电化学过程进行的基础机理研究。基于我们的发现，我们开发了一种硫化铜/碳复合材料，该材料抑制了其在碳酸盐基电解质中的失效机制，并首次在锂离子全电池中证明了其可行性。我们的实验为硫化铜在大规模电能存储的工业规模应用中的利用提供了依据。
