Perfluorinated organics regulating Li2O2 formation and improving stability for Li-oxygen batteries

By Wang, Yuling, Fan Bai, Aiping Wang, Zhonghui Cui, Da Wang, Siqi Shi, and Tao Zhang
Chem Commun (Camb)
March 3, 2021
DOI: 10.1039/d0cc07774g

Lithium-oxygen batteries have a high theoretical capacity, but they are still far from meeting the capacity required for practical applications. In this study, we systematically investigate the synergistic effect of perfluorotributylamine (PFTBA) as an additive in a TEGDME-based electrolyte to optimize the electrochemical performance of Li-O2 batteries. PFTBA promotes cyclic Li2O2 growth, and the discharge capacity is increased to 9548.7 mA h g-1. Moreover, the hydrophobicity of PFTBA can aid in the protection of the lithium anode against corrosion as it remains stable during cycling. The Li-O2 battery exhibited enhanced cycling stability (200 cycles) as a consequence. This study reveals that PFTBA increases the capacity and provides more possibilities for the application of perfluorinated chemicals in Li-O2 batteries.

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