Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

P2‐K0.75[Ni1/3Mn2/3]O2 Cathode Material for High Power and Long Life Potassium‐Ion Batteries

P2‐K0.75[Ni1/3Mn2/3]O2 Cathode Material for High Power and Long Life Potassium‐Ion Batteries 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advanced Energy Materials Wiley

P2‐K0.75[Ni1/3Mn2/3]O2 Cathode Material for High Power and Long Life Potassium‐Ion Batteries

Loading next page...
 
/lp/wiley/p2-k0-75-ni1-3mn2-3-o2-cathode-material-for-high-power-and-long-life-aOJ1gDPm1Q
Publisher
Wiley
Copyright
© 2020 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim
ISSN
1614-6832
eISSN
1614-6840
DOI
10.1002/aenm.201903605
Publisher site
See Article on Publisher Site

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.

Journal

Advanced Energy MaterialsWiley

Published: Feb 1, 2020

Keywords: ; ; ; ;

References