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Realizing High‐Performance Li–Polysulfide Full Cells by using a Lithium Bis(trifluoromethanesulfonyl)imide Salt Electrolyte for Stable Cyclability
ChemSusChem ( IF 8.4 ) Pub Date : 2018-08-23 , DOI: 10.1002/cssc.201801432
Syed Abdul Ahad 1, 2 , Ragupathy Pitchai 2, 3 , Anteneh Marelign Beyene 2 , Sang Hoon Joo 1 , Do Kyung Kim 2 , Hyun-Wook Lee 1
Affiliation  

Since concentrated electrolytes have attracted great attention for the stabilization of lithium‐metal anodes for lithium‐ion batteries, the demonstration of a full cell with an electrolyte concentration study has become a research topic of interest. Herein, we have demonstrated a proof of concept, a lithium–polysulfide full cell battery using various lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) electrolyte concentrations with glass‐fiber‐based composite and hard carbon as the cathode and anode, respectively. The initial capacity of the lithium‐polysulfide full cell is found to be 970 mA h g−1 at 0.1 C. The capacity is stabilized at 870 mA h g−1 after 100 cycles with a capacity retention of 88.6 %. An excellent capacity retention of ≈80 % is achieved after long 800 cycles at 0.5 C by using full cell technology. Further, our post‐mortem analysis sheds light on the difference in SEI layer formation on hard carbon anodes with changing electrolyte concentration, thereby indicating reasons for the obtainment of a high cyclic performance with 1 m LiTFSI salt electrolyte. The successful demonstration of the long cyclic performance of Li–polysulfide full cells is indeed a step towards producing high performance Li–polysulfide full cell batteries with long cycling using conventional LiTFSI salt electrolyte and commercial anode materials.

中文翻译:

通过使用双(三氟甲磺酰基)亚胺锂盐电解质实现高性能的锂多硫化全电池,以实现稳定的循环性

由于浓缩电解质在稳定锂离子电池的锂金属阳极方面引起了极大的关注,因此对具有电解质浓度的全电池进行演示的研究已成为人们关注的研究课题。在这里,我们证明了一种概念证明,即使用各种浓度的双(三氟甲磺酰基)酰亚胺(LiTFSI)电解质,玻璃纤维基复合材料和硬碳作为正极和负极的锂-多硫化全电池。发现多硫化锂充满电池的初始容量在0.1 C时为970 mA h g -1。该容量稳定在870 mA h g -1100次循环后,容量保持率为88.6%。通过使用全电池技术,在0.5 C下长时间800个循环后,可实现约80%的出色容量保持率。此外,我们的事后分析揭示了随着电解质浓度的变化,硬碳阳极上SEI层形成的差异,从而表明了使用1 m LiTFSI盐电解质获得高循环性能的原因 。成功证明锂-多硫化物全电池的长循环性能确实是朝着使用传统的LiTFSI盐电解质和市售阳极材料长时间循环生产高性能锂-多硫化物全电池迈出的一步。
更新日期:2018-08-23
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