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Title: A long-life lithium-oxygen battery via a molecular quenching/mediating mechanism

Journal Article · · Science Advances
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1];  [1];  [1];  [3]; ORCiD logo [3]; ORCiD logo [3];  [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [1]
  1. University of Technology, Sydney (Australia)
  2. University of Technology, Sydney (Australia); University of New South Wales, Sydney, NSW (Australia)
  3. Nanjing University (China)
  4. Chinese Academy of Sciences (CAS), Dalian (China)
  5. Argonne National Lab. (ANL), Lemont, IL (United States)

The advancement of lithium-oxygen (Li-O2) batteries has been hindered by challenges including low discharge capacity, poor energy efficiency, severe parasitic reactions, etc. We report an Li-O2 battery operated via a new quenching/mediating mechanism that relies on the direct chemical reactions between a versatile molecule and superoxide radical/Li2O2. The battery exhibits a 46-fold increase in discharge capacity, a low charge overpotential of 0.7 V, and an ultralong cycle life >1400 cycles. Featuring redox-active 2,2,6,6-tetramethyl-1-piperidinyloxy moieties bridged by a quenching-active perylene diimide backbone, the tailor-designed molecule acts as a redox mediator to catalyze discharge/charge reactions and serves as a reusable superoxide quencher to chemically react with superoxide species generated during battery operation. The all-in-one molecule can simultaneously tackle issues of parasitic reactions associated with superoxide radicals, singlet oxygen, high overpotentials, and lithium corrosion. The molecular design of multifunctional additives combining various capabilities opens a new avenue for developing high-performance Li-O2 batteries.

Research Organization:
Argonne National Laboratory (ANL), Lemont, IL (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office; Australian Research Council; National Key R&D Program of China; National Natural Science Foundation of China; Newton Advanced Fellowships
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1882653
Journal Information:
Science Advances, Journal Name: Science Advances Journal Issue: 3 Vol. 8; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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