期刊
ADVANCED ENERGY MATERIALS
卷 10, 期 7, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201903605
关键词
battery; cathode; first-principle calculation; layered structure; potassium
类别
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science, and Technology of Korea [NRF-2017R1A2A2A05069634, NRF-2015M3D1A1069713, NRF-2019H1D8A2106002]
Rationally designed P2-K-0.75[Ni1/3Mn2/3]O-2 is introduced as a novel cathode material for potassium-ion batteries (KIBs). P2-K-0.75[Ni1/3Mn2/3]O-2 cathode material designed through electrochemical ion-exchange from P2-Na-2/3[Ni1/3Mn2/3]O-2 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-K-0.75[Ni1/3Mn2/3]O-2 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 K-0.75[Ni1/3Mn2/3]O-2 structure with a low activation barrier energy of approximate to 210 meV. These findings indicate that P2-K-0.75[Ni1/3Mn2/3]O-2 is a promising candidate cathode material for high-rate and long-life KIBs.
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