Journal
NATIONAL SCIENCE REVIEW
Volume 8, Issue 10, Pages -Publisher
OXFORD UNIV PRESS
DOI: 10.1093/nsr/nwaa287
Keywords
electrochemistry; rechargeable battery; beyond Li-ion battery; long-term cycle life; high capacity cathode
Categories
Funding
- National Basic Research Program of China [2016YFB0100203]
- National Natural Science Foundation of China [21633003, U1801251]
- DOE Office of Science [DE-AC0206CH11357]
Ask authors/readers for more resources
This study successfully achieved the reversible conversion of KO2/K2O2 in a sealed cell environment, enhancing capacity-boosting strategies through controlled depth of discharge and electrolyte modification, which improved battery cycling stability and energy efficiency.
As a promising low-cost energy storage device, the development of a rechargeable potassium-ion battery (KIB) is severely hindered by the limited capacity of cathode candidates. Regarded as an attractive capacity-boosting strategy, triggering the O-related anionic redox activity has not been achieved within a sealed KIB system. Herein, in contrast to the typical gaseous open K-O-2 battery (O-2/KO2 redox), we originally realize the reversible superoxide/peroxide (KO2/K2O2) interconversion on a KO2-based cathode. Controlled within a sealed cell environment, the irreversible O-2 evolution and electrolyte decomposition (induced by superoxide anion (O-2(-)) formation) are effectively restrained. Rationally controlling the reversible depth-of-charge at 300 mAh/g (based on the mass of KO2), no obvious cell degradation can be observed during 900 cycles. Moreover, benefitting from electrolyte modification, the KO2-based cathode is coupled with a limited amount of K-metal anode (merely 2.5 times excess), harvesting a K-metal full-cell with high energy efficiency (similar to 90%) and long-term cycling stability (over 300 cycles).
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available