期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 8, 页码 9332-9340出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b22087
关键词
potassium-ion battery; cathode material; K0.83V2O5; layered vanadium oxide; energy storage
资金
- National Natural Science Foundation of China [U1663224, 51902014]
- Top-notch Talents program of Beihang University
- Thousand Youth Talents Plan of China
- 111 Project [B14009]
- Tsinghua University-Zhangjiagang Joint Institute for Hydrogen Energy and Lithium-Ion Battery Technology (JIHLT)
Recently, potassium-ion batteries (PIBs) are being actively investigated. The development of PIBs calls for cathode materials with a rigid framework, reversible electrochemical reactivity, and a high amount of extractable K ions, which is extremely challenging due to the large size of potassium. Herein, a new layered compound K0.83V2O5 is reported as a potential cathode material for PIBs. It delivers an initial depotassiation capacity of 86 mAh g(-1) and exhibits a reversible capacity of 90 mAh g(-1) with a high redox potential of 3.5 V (vs K+/K) and a capacity retention of more than 80% after 200 cycles. Experimental investigations combined with theoretical calculation indicate that depotassiation-potassiation is accommodated by contraction-expansion of the interlayer spacing along with unpuckering-puckering of the layers. Additionally, the calculated electronic structure suggests the (semi)metallic feature of KxV2O5 (0 < x <= 0.875) and K-ion transport in the material is predicted to be one-dimensional with the experimentally estimated chemical diffusion coefficient in the order of 10(-15)-10(-12) cm(2) s(-1). Finally, a K-ion full cell consisting of the K0.83V2O5 cathode and a graphite anode is demonstrated to deliver an energy density of 136 Wh kg(-1). This study will provide insights for further designing novel layered cathodes with high K-ion content for PIBs.
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