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- Title
P2‐K<sub>0.75</sub>[Ni<sub>1/3</sub>Mn<sub>2/3</sub>]O<sub>2</sub> Cathode Material for High Power and Long Life Potassium‐Ion Batteries.
- Authors
Jo, Jae Hyeon; Choi, Ji Ung; Park, Yun Ji; Jung, Young Hwa; Ahn, Docheon; Jeon, Tae‐Yeol; Kim, Hyungsub; Kim, Jongsoon; Myung, Seung‐Taek
- Abstract
Rationally designed P2‐K0.75[Ni1/3Mn2/3]O2 is introduced as a novel cathode material for potassium‐ion batteries (KIBs). P2‐K0.75[Ni1/3Mn2/3]O2 cathode material designed through electrochemical ion‐exchange from P2‐Na2/3[Ni1/3Mn2/3]O2 exhibits satisfactory electrode performances; 110 mAh g−1 (20 mA g−1) retaining 86% of capacity for 300 cycles and unexpectedly high reversible capacity of about 91 mAh g−1 (1400 mA g−1) with excellent capacity retention of 83% over 500 cycles. According to theoretical and experimental investigations, the overall potassium storage mechanism of P2‐K0.75[Ni1/3Mn2/3]O2 is revealed to be a single‐phase reaction with small lattice change upon charge and discharge, presenting the Ni4+/2+ redox couple reaction. Such high power capability is possible through the facile K+ migration in the K0.75[Ni1/3Mn2/3]O2 structure with a low activation barrier energy of ≈210 meV. These findings indicate that P2‐K0.75[Ni1/3Mn2/3]O2 is a promising candidate cathode material for high‐rate and long‐life KIBs.
- Subjects
ELECTRODE performance; ELECTRIC batteries; OXIDATION-reduction reaction; ION exchange (Chemistry); ACTIVATION energy; CATHODES; MATERIALS; ALKALINE batteries
- Publication
Advanced Energy Materials, 2020, Vol 10, Issue 7, p1
- ISSN
1614-6832
- Publication type
Article
- DOI
10.1002/aenm.201903605