This work reports on further development of the concept “two cathodes in one” for lithium‐ion batteries. The cathodes are composed of LiFePO₄ (high power) and sulfur (high gravimetric capacity), allowing high discharging rates as well as high gravimetric capacities, which are especially attractive for numerous existing applications. In this study, different strategies have been tested to reduce polysulfide shuttling in batteries with these cathodes, greatly improving their performance. Batteries which were assembled with electrolyte mixtures of tetramethylsulfone and 1,1,2,2‐tetrafluoroethyl‐2,2,3,3‐tetrafluoropropyl ether (TMS/TTE) show significantly better performance than with the typical electrolyte composition used for Li−S batteries. Moreover, various carbons with different pore size distributions in the C/S composite were mixed with LiFePO₄ in an electrode reaching high discharge capacities (72 % of the theorical composite capacity) and stable Coulombic efficiency of 99 %. As a result, an improved active material utilization is observed, confirming its possible application as a commercial battery cathode.

中文翻译：

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通过减少多硫化物穿梭的策略实现高性能的锂离子电池，其中硫和“ LiFePO4”合二为一

这项工作报告了锂离子电池“两个阴极合而为一”的概念的进一步发展。阴极由LiFePO ₄组成（高功率）和硫（高重量容量），可实现高放电速率和高重量容量，这对于许多现有应用特别有吸引力。在这项研究中，已经测试了不同的策略来减少带有这些阴极的电池中的多硫化物穿梭，从而大大提高了它们的性能。与四甲基砜和1,1,2,2-四氟乙基-2-2,2,3,3-四氟丙基醚（TMS / TTE）的电解质混合物组装而成的电池表现出比典型的Li-S电解质组合物更好的性能电池。此外，将C / S复合材料中孔径分布不同的各种碳与LiFePO ₄混合达到高放电容量（理论复合容量的72％）和99％的稳定库仑效率的电极。结果，观察到活性物质利用率提高，证实了其可能用作商业电池阴极。