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Pursuing graphite-based K-ion O2 batteries: a lesson from Li-ion batteries

Journal Article · · Energy & Environmental Science
DOI:https://doi.org/10.1039/d0ee01361g· OSTI ID:1849786
 [1];  [2];  [2];  [3];  [3];  [2]
  1. The Ohio State Univ., Columbus, OH (United States); OSTI
  2. The Ohio State Univ., Columbus, OH (United States)
  3. Tsinghua Univ., Shenzhen (China)
+ Show Author Affiliations
The replacement of lithium metal by lithium intercalated graphite was crucial for developing safe lithium-ion batteries. Superoxide-based potassium–oxygen batteries represent an exciting metal–oxygen battery with the highest energy efficiencies. However, using potassium metal is a more serious safety threat than lithium. Herein, we explore the possibility of graphite-intercalation anodes for potassium-ion oxygen batteries (PIOBs) with enhanced safety. This work demonstrates for the first time that establishing an artificial potassium salt-rich solid electrolyte interphase (SEI) enables a reversible graphite-intercalation anode (249.6 mA h g-1 after 600 cycles) in a potassium bis(trifluoromethanesulfonyl)imide (KTFSI)-based localized high-concentration electrolyte. Such an electrolyte is stable with the superoxide cathode. The PIOB delivers energy efficiencies above 90% at a depth of discharge (DOD) of 25% for 80 cycles. A three-electrode measurement shows that its overpotential mainly comes from the anode. The lifespan is limited to the gradual degradation of the artificial SEI caused by oxygen crossover. This work represents a step towards achieving holistic anode–electrolyte–cathode compatibility in a PIOB and its realistic evaluation under a controlled DOD.
Research Organization:
The Ohio State Univ., Columbus, OH (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-07ER46427
OSTI ID:
1849786
Alternate ID(s):
OSTI ID: 1661737
Journal Information:
Energy & Environmental Science, Journal Name: Energy & Environmental Science Journal Issue: 10 Vol. 13; ISSN 1754-5692
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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