Journal
ENERGY STORAGE MATERIALS
Volume 50, Issue -, Pages 564-571Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2022.05.037
Keywords
Lithium-oxygen batteries; Lithium-air batteries; Phase transfer catalyst; Charge overpotential
Funding
- National Natural Science Foundation of China [51902223, 51932005, U2001220]
- National Key Research and Development Program of China [2021YFF0500600]
- Natural Science Foundation of Tianjin [20JCYBJC00850]
- Haihe Labortary of Sustainable Chemical Transformations
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This study reports the use of lithium phthalimide-N-oxyl (LiPINO) as a phase transfer catalyst (PTC) to promote Li2O2 formation and its reversible decomposition, improving the performance and stability of Li-O-2 batteries.
Li-O-2 batteries require catalysts to solve the problem of sluggish oxygen-related reaction kinetics. However, the solid catalysts and redox mediators are intrinsically deficient due to poor solid contacts and shuttle problems, respectively. Here, we report lithium phthalimide-N-oxyl (LiPINO) as a phase transfer catalyst (PTC) for promoting Li2O2 formation and its reversible decomposition through the solution-phase reactions. The interaction between LiPINO and oxygen species in the electrolyte enables the high dissolution and stability of oxygen species, the fast charge transfer at liquid-solid interfaces and superior kinetics, and the suppressed side reactions. The efficient bidirectional catalytic activity and high stability of LiPINO capacitate batteries with a highly improved discharge capacity (11400 mAh g(-1)), a largely lowered charge potential (3.14 V) and an extended cycle life (more than 200 cycles) both in O(2 )and air. Our understanding of the phase-transfer catalysis towards the Li-O-2 electrochemistry and the discovery of the PTC with superior activity and stability provide deep insights into the design of the most reliable catalysts for Li-O-2 batteries.
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